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  4. How gravity works in spiral galaxy?
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How gravity works in spiral galaxy?

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Offline Kryptid

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Re: How gravity works in spiral galaxy?
« Reply #620 on: 21/09/2019 05:49:43 »
Quote from: Dave Lev on 21/09/2019 04:34:27
The combination of ultra high gravity of the SMBH + the mighty magnetic fields sets the creation of new particle/atom.

How do you propose that works, exactly? What is the precise mechanism?

Quote from: Dave Lev on 21/09/2019 04:34:27
I say "almost" as our scientists consider that it is totally free.
We have already discussed deeply about the impact on the gravity force in the long run.
Let's look again on the Sun/Earth gravity system.
If I recall it correctly, you assume that the gravity stays at the same amplitude over time (assuming that there is no reduction in the mass).
So, you don't see any reduction in the gravity force while the sun holds the Earth in its orbital momentum by gravity.
You have stated that the Earth is drifting outwards not due to gravity force reduction but due to tidal.
So, you actually claim that the gravity is there for free for ever.
I have stated that there must be a "friction" or reduction also in gravity over time.
So, the Earth is drifting outwards over time as the gravity is reducing due to the orbital activity.

And why do you propose that gravity gets weaker over time? Why should that be the case? What causes it? More importantly, what evidence do you have for this?

Quote from: Dave Lev on 21/09/2019 04:34:27
Why when it comes to pair production there is a reduction in the gravity force, while when it comes to any gravity system (as the orbital path of the Sun around the galaxy) there is no gravity force reduction?

There isn't. The same total amount of mass is present and therefore the same total amount of gravity is also present. The only thing that has changed is the location of the mass. When a particle pair forms, the mass that formed the pair was taken out of the black hole. The total (black hole + particle pair) has the same mass as the original black hole before the formation of the pair.

Quote from: Dave Lev on 21/09/2019 04:34:27
I don't agree with that as there must be also a reduction in gravity over time (even if it is a very low reduction).

There would be a reduction of gravity from the Sun over time because the Sun is continually shooting particles, gas, and radiation out into the Universe. That process carries mass away from the Sun and therefore also decreases its gravity over time. There is no need for new physics to explain that.

Quote from: Dave Lev on 21/09/2019 04:34:27
Our scientists assume that the Sun stays exactly at the same radius from its first moment.
Therefore, they claim that the Sun orbits around the galaxy for the last 6 billion years exactly at the same radius.

I'm rather doubtful that this is the consensus view. Stars are constantly on the move, with some coming closer to the Sun and others moving further away. You would expect those gravitational interactions to change the Sun's position at least a little over time. Again, no need for new physics.

Quote from: Dave Lev on 21/09/2019 04:34:27
In any case, if you assume that the sun is not losing gravity force due to its orbital momentum around the galaxy, than I can claim that a new created particle is also do not set any reduction in the gravity force of the SMBH (close to the Event Horizon).

The Sun is losing gravity because it is slowly losing mass. Gravity is directly linked to mass. Take away some mass and you take away some gravity. If you take particles out of the Sun, the Sun loses a bit of mass and gravity. This is happening constantly. The exact same thing happens if you remove mass from a black hole in order to form particles.

Quote from: Dave Lev on 21/09/2019 04:34:27
I claim that the SMBH is losing much less than 1.022 keV in order to form an electron-positron pair as the activity of that creation is based on Gravity + Magnetic Energy.

Then you are explicitly breaking the first law of thermodynamics.

Quote from: Dave Lev on 21/09/2019 04:34:27
As the Gravity comes almost for free,

Gravity is "free" in the sense that a certain amount of gravity is always associated with a certain amount of mass. That's the gravitational constant.

Quote
than the total reduction in the Gravity + Magnetic Energy must be less than 1.022 keV/2

Non-sequitur.

Quote from: Dave Lev on 21/09/2019 04:34:27
For this explanation let's assume that the total reduction in the Gravity +Magnetic Energy of the SMBH that is needed to create electron-positron pair is 1.022 keV/4.

If you "assume" that, then you "assume" that there is a violation of the first law of thermodynamics.

Quote from: Dave Lev on 21/09/2019 04:34:27
This is a win win situation.

It is beyond my understanding how you think that a system which creates more mass-energy than it uses doesn't violate the first law of thermodynamics. That's the very definition of what the law is.
« Last Edit: 21/09/2019 05:56:16 by Kryptid »
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #621 on: 21/09/2019 06:47:27 »
Quote from: Kryptid on 21/09/2019 05:49:43
The total (black hole + particle pair) has the same mass as the original black hole before the formation of the pair.
That is absolutely correct.
Please look at the following article:
https://en.wikipedia.org/wiki/Pair_production
"the created particles shall have opposite values of each other. For instance, if one particle has electric charge of +1 the other must have electric charge of −1, or if one particle has strangeness of +1 then another one must have strangeness of −1."
So, we get the pair-production without any effect on the SMBH mass as the total mass of the Pair is zero. (One is positive while the other is negative).
Quote from: Kryptid on 21/09/2019 05:49:43
When a particle pair forms, the mass that formed the pair was taken out of the black hole.
That is totally incorrect
As I have proved the total mass of the pair is Zero, therefore, the pair production doesn't take any mass out of the black hole.
Therefore, the pair-production is for free.
The SMBH is not losing any mass due to this production process.
Now, let's assume that one particle is falling inwards into the SMBH, while the other one is squirted outwards to the accretion disc.
If a particle that falls inwards into the SMBH has the same polarity as the SMBH than it should increase the total mass of the SMBH. Otherwise, it should decrease the total mass.
The same idea is correct also for the particle which is squirted outwards to the accretion disc.
I claim that as the SMBH is made out of negative polarity mass, the in falling negative particle must increase its mass, while the other positive particle is squirted outwards into the accretion disc.
Our scientists consider that the SMBH is made out of positive polarity mass.
Therefore, they assume that the in falling negative particle should decrease its total mass.
This is their biggest mistake.
As I have already explained, the SMBH is a huge barrel for negative particles.
The gravity effects of Negative mass are identical to a positive mass.
Therefore, while the SMBH increases its negative mass, the accretion disc gets for free the positive particle.
Therefore, both are increasing their total mass without violation the first low of thermodynamics.


« Last Edit: 21/09/2019 06:59:25 by Dave Lev »
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Offline Kryptid

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Re: How gravity works in spiral galaxy?
« Reply #622 on: 21/09/2019 07:00:26 »
Quote from: Dave Lev on 21/09/2019 06:47:27
That is absolutely correct.
Please look at the following article:
https://en.wikipedia.org/wiki/Pair_production
"the created particles shall have opposite values of each other. For instance, if one particle has electric charge of +1 the other must have electric charge of −1, or if one particle has strangeness of +1 then another one must have strangeness of −1."
So, we get the pair-production without any effect on the SMBH mass as the total mass of the Pair is zero. (One is positive while the other is negative.

That isn't talking about mass (unless you are speaking of Hawking radiation, in which case the particle falling into the hole does indeed have a negative mass).

Quote from: Dave Lev on 21/09/2019 06:47:27
That is totally incorrect
As I have proved the total mass of the pair is Zero, therefore, the pair production doesn't take any mass out of the black hole.

Alright, let's assume that you are creating a negative-mass and positive-mass particle pair, for the sake of argument...

Quote from: Dave Lev on 21/09/2019 06:47:27
The SMBH is not losing any mass due to this production process.

If it's eating the negative-mass particle, it is.

Quote from: Dave Lev on 21/09/2019 06:47:27
I claim that as the SMBH is made out of negative polarity mass, the in falling negative particle must increase its mass, while the other positive particle is squirted outwards into the accretion disc.

That's not how math works. Making a negative number more negative is a decrease, not an increase. Going from -10 to -20 is a decrease. So the black hole is still losing mass if it's eating negative-mass particles.

Quote from: Dave Lev on 21/09/2019 06:47:27
The gravity effects of Negative mass are identical to a positive mass.

Anyone who can do basic arithmetic can prove this wrong by putting a negative number for mass into the gravitational force equation. You end up with a repulsion, not an attraction. A negative mass producing an attractive gravitational field indistinguishable from a positive mass would also lead to a violation of the first law of thermodynamics. It would allow you to create increasingly strong gravitational potentials out of nothing, which in turn creates extra gravitational potential energy of any orbiting objects out of nothing. That's a violation of conservation of energy.

Also, when are you going to explain what the mechanism is that allows gravity and magnetism alone to create charged particle pairs? The Hawking process isn't going to do it for a SMBH (only neutral particles can be created by them), so how does your idea work?
« Last Edit: 21/09/2019 07:09:03 by Kryptid »
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #623 on: 21/09/2019 07:18:16 »
Quote from: Kryptid on 21/09/2019 07:00:26
That's not how math works. Making a negative number more negative is a decrease, not an increase. Going from -10 to -20 is a decrease. So the black hole is still losing mass if it's eating negative-mass particles.
Sorry, that is a fatal mistake
-10-1 = -11
So, as the SMBH is made out of negative polarity matter/mass, by adding a negative particle we do increase its total mass.
Why you don't agree with that?

« Last Edit: 21/09/2019 07:45:09 by Dave Lev »
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #624 on: 21/09/2019 14:31:00 »
Quote from: Halc on 21/09/2019 13:13:29
You didn't learn in 3rd grade that -11 is less than -10?  Adding a negative number to any number (positive or negative) decreases the value.
Also,  other masses (both positive and negative) will accelerate away from negative mass and thus cannot form gravitationally bound objects like a planet or black hole.  If you actually worked through the trivial equations of Newton's gravitational force and resulting acceleration (F=GMm/r² and F=ma, or a=GM/r²), this would be apparent.
Let's look at the following:
https://en.wikipedia.org/wiki/Negative_mass
"In theoretical physics, negative mass is matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg."
In our case, we do not discuss on a Negative mass.
We actually discuss on a negative charged mass.
Let's look on a pair particles (Positron/Electron)
https://en.wikipedia.org/wiki/Positron
"The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1 e, a spin of 1/2 (same as electron), and has the same mass as an electron. "
So, the mass of the Positron is equal to the mass of the electron.
We don't have a negative mass, but we have a negative charged mass.
Therefore, the mass is there even for electron.
In gravity, we do not count the polarity of the mass charged.
We only monitor the total mass.
So, the total mass of one billion positrons is equal to the total mass of one billion electrons.
It is a mistake to assume that the mass of electron is –M Kg while the mass of the positron is +M kg.
Both have a positive mass, while their charged polarity is different.
So, the total mass of an object with only one billion positrons will be M, while the total mass with one billion electrons will also be M.
Again, both will be represented by real positive mass (and not negative mass).
Therefore, the gravity force of an object which is fully made with positrons should be identical to an object which is full made with the same numbers of electrons.

« Last Edit: 21/09/2019 14:37:38 by Dave Lev »
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Offline Kryptid

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Re: How gravity works in spiral galaxy?
« Reply #625 on: 21/09/2019 14:36:24 »
Quote from: Dave Lev on 21/09/2019 07:18:16
Why you don't agree with that?

Because -11 is smaller than -10...

Quote from: Dave Lev on 21/09/2019 14:31:00
Let's look at the following:
https://en.wikipedia.org/wiki/Negative_mass
"In theoretical physics, negative mass is matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg."
In our case, we do not discuss on a Negative mass.
We actually discuss on a negative charged mass.
Let's look on a pair particles (Positron/Electron)
https://en.wikipedia.org/wiki/Positron
"The positron or antielectron is the antiparticle or the antimatter counterpart of the electron. The positron has an electric charge of +1 e, a spin of 1/2 (same as electron), and has the same mass as an electron. "
So, the mass of the Positron is equal to the mass of the electron.
We don't have a negative mass, but we have a negative charged mass.
Therefore, the mass is there even for electron.
In gravity, we do not count the polarity of the mass charged.
We only monitor the total mass.
So, the total mass of one billion positrons is equal to the total mass of one billion electrons.
It is a mistake to assume that the mass of electron is –M Kg while the mass of the positron is +M kg.
Both have a positive mass, while their charged polarity is different.
So, the total mass of an object with only one billion electrons will be M, while the total mass with one billion electrons will also be M.
Again, both will be represented by real positive mass (and not negative mass).
Therefore, the gravity force of an object which is fully made with positrons should be identical to an object which is full made with the same numbers of electrons.

Now you are contradicting yourself, because you explicitly said:

Quote from: Dave Lev on 21/09/2019 06:47:27
The gravity effects of Negative mass are identical to a positive mass.
Therefore, while the SMBH increases its negative mass, the accretion disc gets for free the positive particle.

If we are still talking about positive mass, then what I said here still applies:

Quote
If you propose that a black hole can become heavier by eating some of the mass that was taken out of it, you are absolutely are proposing such a violation. Let's say that the magnetic field transfers 1.022 keV of mass-energy out of the black hole into order to form an electron-positron pair. The black hole must now weigh 1.022 keV less than it did before. Now, one of those particles (0.511 keV) is thrown either into the accretion disk or into the jet, while the other 0.511 keV particle falls back into the black hole. The black hole lost 1.022 keV by forming the particle pair and only got 0.511 keV back by eating one member of the pair. That's still a net loss of 0.511 keV. Elementary school arithmetic demands that the black hole has lost mass, not gained it.
« Last Edit: 21/09/2019 14:53:12 by Kryptid »
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #626 on: 21/09/2019 15:05:21 »
Quote from: Kryptid on 21/09/2019 14:36:24
Now you are contradicting yourself, because you explicitly said:
Quote
The gravity effects of Negative mass are identical to a positive mass.
Therefore, while the SMBH increases its negative mass, the accretion disc gets for free the positive particle.
Sorry for that.
My intention was negative charged mass.
In any case, from the SMBH point of view, those new created particles has an opposite charged and therefore, they do not have any effect on its mass at the moment of their creation.
Actually if one second later on they will meet with each other, they will eliminate each other:
"When a positron collides with an electron, annihilation occurs."
So, the creation of the pair-production does not change the total mass of the SMBH as the annihilation does not change its mass.
« Last Edit: 21/09/2019 15:11:09 by Dave Lev »
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Offline Kryptid

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Re: How gravity works in spiral galaxy?
« Reply #627 on: 21/09/2019 20:05:06 »
Quote from: Dave Lev on 21/09/2019 15:05:21
In any case, from the SMBH point of view, those new created particles has an opposite charged and therefore, they do not have any effect on its mass at the moment of their creation.

If the needed mass-energy to create the electron-positron pair didn't come from the black hole, then where did it come from? It has to come from somewhere. Whatever that source of mass-energy may be, the source must lose mass-energy in the process of creating that particle pair because that particle pair has a positive net mass-energy. That mass-energy cannot come from the gravitational or magnetic field themselves, as fields can only transform or transfer mass-energy, not create it.

Quote from: Dave Lev on 21/09/2019 15:05:21
Actually if one second later on they will meet with each other, they will eliminate each other:
"When a positron collides with an electron, annihilation occurs."
So, the creation of the pair-production does not change the total mass of the SMBH as the annihilation does not change its mass.

If the particles annihilate, then you don't have a scenario where one falls into the black hole and the other moves out into the accretion disk. But how can it move out into the accretion disk anyway? You claim that the magnetic field is an impassable barrier. A charged particle shouldn't be able to get through it.

This is the key question to know whether your model breaks the first law of thermodynamics or not:

Does the black hole-accretion disk-jet system increase the total amount of mass-energy in the Universe over time?

If your answer to this question is "no", then you have obeyed the first law of thermodynamics.

If your answer to this question is "yes", then your model violates the first law of thermodynamics and has therefore falsified itself.
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #628 on: 22/09/2019 05:37:15 »
Quote from: Kryptid on 21/09/2019 20:05:06
If the needed mass-energy to create the electron-positron pair didn't come from the black hole, then where did it come from? It has to come from somewhere. Whatever that source of mass-energy may be, the source must lose mass-energy in the process of creating that particle pair because that particle pair has a positive net mass-energy. That mass-energy cannot come from the gravitational or magnetic field themselves, as fields can only transform or transfer mass-energy, not create it.
Based on what data do you set this assumption?
https://en.wikipedia.org/wiki/Hawking_radiation
In the following article it is stated:
"Physical insight into the process may be gained by imagining that particle–antiparticle radiation is emitted from just beyond the event horizon. This radiation does not come directly from the black hole itself, but rather is a result of virtual particles being "boosted" by the black hole's gravitation into becoming real particles."
"An alternative view of the process is that vacuum fluctuations cause a particle–antiparticle pair to appear close to the event horizon of a black hole."
It is stated clearly that the particle–antiparticle radiation/creation does not come directly from the black hole itself.
Therefore, the BH doesn't lose any mass during this creation process.
In the article it is stated also:
"As the particle–antiparticle pair was produced by the black hole's gravitational energy, the escape of one of the particles lowers the mass of the black hole"
So, "the particle–antiparticle pair was produced by the black hole's gravitational energy"
Hence. the creation itself has no effect on the BH mass. As the positive charged particle is ejected outwards, the Negative charged particle must fall in. Our scientists estimate that the BH is made out of positive charged mass; Therefore, this in falling Negative charged particle should reduce its total mass.
So, again - the creation of the pair particles do not have any impact on the total mass of the BH.
Therefore, how could it be that you both are so sure that the creation of the Pair- production must decrease the BH mass while in this article it is stated clearly that it does not come directly from the mass of the black hole itself?
If you still believe that the creation of the pair-production must decrease the mass of the BH than please prove it by real article.
« Last Edit: 22/09/2019 07:14:12 by Dave Lev »
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Offline Kryptid

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Re: How gravity works in spiral galaxy?
« Reply #629 on: 22/09/2019 07:19:35 »
Quote from: Dave Lev on 22/09/2019 05:37:15
Based on what data do you set this assumption?
https://en.wikipedia.org/wiki/Hawking_radiation
In the following article it is stated:
"Physical insight into the process may be gained by imagining that particle–antiparticle radiation is emitted from just beyond the event horizon. This radiation does not come directly from the black hole itself, but rather is a result of virtual particles being "boosted" by the black hole's gravitation into becoming real particles."
"An alternative view of the process is that vacuum fluctuations cause a particle–antiparticle pair to appear close to the event horizon of a black hole."
It is stated clearly that the particle–antiparticle radiation/creation does not come directly from the black hole itself.
Therefore, the BH doesn't lose any mass during this creation process.
In the article it is stated also:
"As the particle–antiparticle pair was produced by the black hole's gravitational energy, the escape of one of the particles lowers the mass of the black hole"
So, the creation itself has no effect on the BH mass. As the positive charged particle is ejected outwards, the Negative charged particle must fall in. Our scientists estimate that the BH is made out of positive charged mass; Therefore, this in falling Negative charged particle should reduce its total mass.
So, again - the creation of the pair particles do not have any impact on the total mass of the BH.
Therefore, how could it be that you both are so sure that the creation of the Pair- production must decrease the BH mass while in this article it is stated clearly that it does not come directly from the mass of the black hole itself?
If you still believe that the creation of the pair-production must decrease the mass of the BH than please prove it by real article.

The particle pair created from the Hawking process does not come directly from the black hole, no, but the net result of the process is the removal of mass from the hole. Adding a negative mass particle (take careful note that I said negative mass and not negative charge, because charge is not what this is about) to a positive mass black hole must necessarily result in the reduction of the black hole's mass.

Hawking radiation involves the creation of a positive mass particle and a negative mass particle (take note again that I am talking about mass here, not positive and negative charge). The negative mass particle falls in and reduces the black hole's mass while the positive mass particle carries the equivalent amount of mass lost by the black hole into the outside Universe.

This, however, does not apply to your model since you insist that negative mass is not involved with whatever process it is that you posit is taking place. Hence why I say that you need to explain the mechanism by which this occurs. Where does the energy come from to create the particle pair in your model? If negative mass is not involved, then each particle must have a positive mass in your model. As such, a source of energy is needed to create them.
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #630 on: 22/09/2019 13:35:51 »
Quote from: Kryptid on 22/09/2019 07:19:35
The particle pair created from the Hawking process does not come directly from the black hole, no, but the net result of the process is the removal of mass from the hole. Adding a negative mass particle (take careful note that I said negative mass and not negative charge, because charge is not what this is about) to a positive mass black hole must necessarily result in the reduction of the black hole's mass.
Where do you get the idea of negative mass and not negative charge???
Did you read the article?
It is stated clearly:
"As the particle–antiparticle pair was produced by the black hole's gravitational energy"
https://en.wikipedia.org/wiki/Antiparticle
"In particle physics, every type of particle has an associated antiparticle with the same mass but with opposite physical charges (such as electric charge). For example, the antiparticle of the electron is the antielectron (which is often referred to as positron). While the electron has a negative electric charge, the positron has a positive electric charge, "
So it is stated clearly that the antimatter is a negative charged mass.
What is your source for negative mass?
Why do you insist on this none realistic idea?
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Offline jeffreyH

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Re: How gravity works in spiral galaxy?
« Reply #631 on: 22/09/2019 14:36:06 »
"As the particle–antiparticle pair was produced by the black hole's gravitational energy"

The gravitational energy extends beyond the event horizon and into the external universe.

Some particles are theorised to be their own antiparticle. So opposite charge would not apply.
https://en.m.wikipedia.org/wiki/Majorana_fermion
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Offline Kryptid

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Re: How gravity works in spiral galaxy?
« Reply #632 on: 22/09/2019 15:02:16 »
Quote from: Dave Lev on 22/09/2019 13:35:51
Where do you get the idea of negative mass and not negative charge???
Did you read the article?
It is stated clearly:
"As the particle–antiparticle pair was produced by the black hole's gravitational energy"
https://en.wikipedia.org/wiki/Antiparticle
"In particle physics, every type of particle has an associated antiparticle with the same mass but with opposite physical charges (such as electric charge). For example, the antiparticle of the electron is the antielectron (which is often referred to as positron). While the electron has a negative electric charge, the positron has a positive electric charge, "
So it is stated clearly that the antimatter is a negative charged mass.

I see your reading comprehension went out the window again. Electrons, which are matter particles, are the negatively-charged particles. The positrons, which are antimatter, are positively-charged.

In the case of a positron-electron pair, yes, one is negatively-charged and one is positively-charged. But this need not be the case. A pair of photons, which are neutral, can be formed instead. We've been through all of this before...

Quote from: Dave Lev on 22/09/2019 13:35:51
What is your source for negative mass?
Why do you insist on this none realistic idea?

Stephen Hawking himself, for one. He mentions it in his book A Brief History of Time. The reason one particle has positive mass and the other negative mass is specifically because the first law of thermodynamics has to be obeyed. The particles were pulled out of a zero-energy state, so their total mass has to add up to zero. By one being positive and the other negative, this is accomplished.

We've already discussed all of this before, don't you remember? We even discussed why the negative mass particle has to be the one that falls into the hole.
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #633 on: 22/09/2019 15:20:27 »
Quote from: Kryptid on 22/09/2019 15:02:16
In the case of a positron-electron pair, yes, one is negatively-charged and one is positively-charged.
OK
So do you finally agree that we discuss on Negative charged mass and not about Negative mass?

Quote from: Kryptid on 22/09/2019 15:02:16
Stephen Hawking himself, for one. He mentions it in his book A Brief History of Time. The reason one particle has positive mass and the other negative mass is specifically because the first law of thermodynamics has to be obeyed. The particles were pulled out of a zero-energy state, so their total mass has to add up to zero. By one being positive and the other negative, this is accomplished.
I really don't understand why do you keep pushing this none realistic idea of Negative mass.
If you still want to hope that Stephen Hawking himself mentioned in his book A Brief History of Time that it is about negative mass (and not about negative charged mass), than please offer a direct web link to his statement.

Quote from: Kryptid on 22/09/2019 15:02:16
We've already discussed all of this before, don't you remember? We even discussed why the negative mass particle has to be the one that falls into the hole.
As I have already stated, my intention was about Negative chraged mass.
« Last Edit: 22/09/2019 15:27:35 by Dave Lev »
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Offline Kryptid

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Re: How gravity works in spiral galaxy?
« Reply #634 on: 22/09/2019 15:28:08 »
Quote from: Dave Lev on 22/09/2019 15:20:27
So do you finally agree that we discuss on Negative charged mass and not about Negative mass?

In the case of a positron-electron pair formed during the Hawking process, one is negatively-charged and the other is positively-charged. One, however, must also have a negative mass while the other has a positive mass.

Quote from: Dave Lev on 22/09/2019 15:20:27
If you still want to hope that Stephen Hawking himself mentioned in his book A Brief History of Time that it is about negative mass (and not about negative charged mass), than please offer a direct web link to his statement.

I own A Brief History of Time and I will post the quote from the book once I get back to my house (that's where it is right now). If I'm not mistaken, Black Holes & Time Warps by physicist Kip S. Thorne says the same thing and I'm pretty sure I quoted it earlier in this thread (if I can find it...).
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #635 on: 22/09/2019 16:27:08 »
Quote from: Kryptid on 22/09/2019 15:28:08
In the case of a positron-electron pair formed during the Hawking process, one is negatively-charged and the other is positively-charged.
That is correct
Quote from: Kryptid on 22/09/2019 15:28:08
One, however, must also have a negative mass while the other has a positive mass.
This is imagination!!!
In the article it is stated:
https://en.wikipedia.org/wiki/Antiparticle
"particle and antiparticle must have
the same mass m
the same spin state J
opposite electric charges q and -q."
Therefore, both have a positive mass.
Hence, would you kindly stop that none realistic idea of Negative mass, or offer a real article which supports this imagination...
« Last Edit: 22/09/2019 16:31:21 by Dave Lev »
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Re: How gravity works in spiral galaxy?
« Reply #636 on: 22/09/2019 18:00:24 »
Quote from: Dave Lev on 22/09/2019 16:27:08
This is imagination!!!
In the article it is stated:
https://en.wikipedia.org/wiki/Antiparticle
"particle and antiparticle must have
the same mass m
the same spin state J
opposite electric charges q and -q."
Therefore, both have a positive mass.

Under normal circumstances, you are correct. All normal matter has positive mass and pair production that occurs in places like particle accelerators has positive mass. However, the circumstances of the Hawking process are different because of the extreme nature of black holes. It's also only a relative thing. The particle only looks negative to a distant observer (anyone outside the event horizon).

Quote
Hence, would you kindly stop that none realistic idea of Negative mass, or offer a real article which supports this imagination...

Later tonight, when I have access to Hawking's book, I'll quote it.

This article from LiveScience does mention it, though: https://www.livescience.com/65683-sonic-black-hole-spews-hawking-radiation.html

Quote
Normally, after a pair of virtual particles appears, they immediately annihilate each other. Next to a black hole, however, the extreme forces of gravity instead pull the particles apart, with one particle absorbed by the black hole as the other shoots off into space. The absorbed particle has negative energy, which reduces the black hole's energy and mass. Swallow enough of these virtual particles, and the black hole eventually evaporates. The escaping particle becomes known as Hawking radiation.

Here is another web page describing the process: https://www.asc.ohio-state.edu/mathur.16/infopublic/info2.3.html

There is also something else I want to emphasize. The idea that virtual particle pairs pop out of the vacuum and are then split by tidal forces at the black hole's event horizon is only an analogy that is used by books in an attempt to illustrate the process to average people who are not experts in the physics involved. This page explains: http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/hawking.html

Quote
How does this work?  Well, you'll find Hawking radiation explained this way in a lot of "pop-science" treatments:

Virtual particle pairs are constantly being created near the horizon of the black hole, as they are everywhere.  Normally, they are created as a particle-antiparticle pair and they quickly annihilate each other.  But near the horizon of a black hole, it's possible for one to fall in before the annihilation can happen, in which case the other one escapes as Hawking radiation.

In fact this argument also does not correspond in any clear way to the actual computation.  Or at least I've never seen how the standard computation can be transmuted into one involving virtual particles sneaking over the horizon, and in the last talk I was at on this it was emphasized that nobody has ever worked out a "local" description of Hawking radiation in terms of stuff like this happening at the horizon.  I'd gladly be corrected by any experts out there...  Note: I wouldn't be surprised if this heuristic picture turned out to be accurate, but I don't see how you get that picture from the usual computation.

Honestly, I'm struggling to understand how the Hawking process actually works myself. Virtual particles don't seem to be a necessary component to the calculations at all. Instead, it seems to have something to do with the local positive and negative frequencies present in the vacuum around the event horizon: https://en.wikipedia.org/wiki/Unruh_effect

Regardless of the specifics of how it all works, there is one thing that is certain: the net result is that conservation of mass and energy are not violated. That is the most important thing to take home from all of this.
« Last Edit: 23/09/2019 01:56:50 by Kryptid »
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Offline Dave Lev (OP)

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Re: How gravity works in spiral galaxy?
« Reply #637 on: 23/09/2019 03:33:38 »
Quote from: Kryptid on 22/09/2019 18:00:24
The absorbed particle has negative energy,
Negative Energy means Negative energy charge.
It doesn't mean negative mass as you might hope for.
Any Energy - positive or Negative - must have real positive mass.
The idea of negative mass is none realistic in my point of view.
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Re: How gravity works in spiral galaxy?
« Reply #638 on: 23/09/2019 04:06:36 »
Quote from: Dave Lev on 23/09/2019 03:33:38
Negative Energy means Negative energy charge.
It doesn't mean negative mass as you might hope for.
Any Energy - positive or Negative - must have real positive mass.
The idea of negative mass is none realistic in my point of view.

It does mean negative mass/energy. Here is the relevant quote from Stephen Hawking's book about it:

Quote
Because energy cannot be created out of nothing, one of the partners in a particle/antiparticle pair will have positive energy, and the other partner negative energy. The one with negative energy is condemned to be a short-lived virtual particle because real particles always have positive energy in normal situations. It must therefore seek out its partner and annihilate with it. However, a real particle close to a massive body has less energy than if it were far away, because it would take less energy to lift it far away against the gravitational attraction of the body.

Normally, the energy of the particle is still positive, but the gravitational field inside a black hole is so strong that even a real particle can have negative energy there. It is therefore possible, if a black hole is present, for the virtual particle with negative energy to fall into the black hole and become a real particle or antiparticle. In this case it no longer has to annihilate with its partner. Its forsaken partner may fall into the black hole as well. Or, having positive energy, it might also escape from the vicinity of the black hole as a real particle or antiparticle (Fig. 7.8 ). To an observer at a distance, it will appear to have been emitted from the black hole. The smaller the black hole, the shorter the distance the particle with negative energy will have to go before it becomes a real particle, and thus the greater rate of emission, and the apparent temperature, of the black hole.

The positive energy of the outgoing radiation would be balanced by a flow of negative energy particles into the black hole. By Einstein's equation E = mc2 (where E is energy, m is mass, and c is the speed of light), energy is proportional to mass. A flow of negative energy into the black hole therefore reduces its mass.

That last sentence makes it unambiguously clear that Hawking is talking about negative energy and not negative charge. This is only further reinforced by the fact that Hawking radiation can be composed of neutral particles like photons, neutrinos and gravitons that don't have any charge at all.
« Last Edit: 23/09/2019 04:11:18 by Kryptid »
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Re: How gravity works in spiral galaxy?
« Reply #639 on: 23/09/2019 13:13:38 »
As a member who knows nothing "for sure", I would submit that gravity expresses itself in waves traveling through space, and  they affect the speed of light based on the density of those waves in space. LIGO evidence shows that massive objects emit gravitational waves, and logic tells me that massive objects absorb gravitational waves. Any elucidation would be appreciated.
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