Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: MeganM on 31/01/2020 08:51:58

Title: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: MeganM on 31/01/2020 08:51:58
Manuel has asked:

Given that dark energy seems to be constant ass the universe expands, could it be that dark matter is a by-product of the combustion of stars (including supernovae) in a process we do not yet understand? Could this explain where dark matter is coming from quantitatively?

Any suggestions?
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: Kryptid on 31/01/2020 17:21:19
Free charge has mass........but it's not gravitational mass.   A very large amount of mass that's immune to gravity,

That makes no sense.
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: Bored chemist on 31/01/2020 18:30:11
The largest by product of solar combustion seems to be isolated, accelerated free charge.

Think of all the stars burning for eons and eons......and spewing that charge.

Where does it all go?

Free charge has mass........but it's not gravitational mass.   A very large amount of mass that's immune to gravity, how does that fit in?
Do you even science?
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: evan_au on 31/01/2020 20:44:35
Quote from: OP
Given that dark energy seems to be constant ass the universe expands, could it be that dark matter
At present, Dark Matter and Dark Energy are thought to be entirely different phenomena
- acting on different scales (the effects of Dark matter is visible within galaxies; Dark Energy is only visible between us and very distant galaxies)
- acting with opposite force (Dark Matter pulls galaxies together; Dark Energy pulls galaxies further apart)

So the "Given... could" does not follow.

Quote
could it be that dark matter is a by-product of the combustion of stars (including supernovae)
One of the early theories for Dark Matter was that it was composed of things like black holes.
- Black holes are formed in supernovae at the end of a massive star's lifetime
- This theory was called "MACHO": MAssive Compact Halo Objects
- There have been attempts to measure the number of black holes in our galaxy by looking at "microlensing" events: When a black hole drifts near our line of sight to a star, it acts like a lens and magnifies the star for a few days.
- The conclusion from these searches was that there aren't enough stellar-mass black holes in our galaxy to provide the mass needed to hold our galaxy together
See: https://en.wikipedia.org/wiki/Massive_compact_halo_object

Presumably, some of the current satellites searching for exoplanets using the transit method would be sensitive to microlensing events, and could be a more sensitive search for galactic black holes. However, the software is optimised to search for periodic short-term dips in brightness (lasting a few hours), not one-off longer-term increases in brightness (lasting days to weeks).

Quote
could it be that dark matter is a by-product of a process we do not yet understand?
The next favourite theory was that Dark Matter was that it is composed of some unknown subatomic particle.
- To contrast it with MACHO, this theory was called WIMP: Weakly-Interacting Massive Particles
See: https://en.wikipedia.org/wiki/Weakly_interacting_massive_particles

Many searches for these WIMPs have come up empty, so experimental physicists are thinking that we don't understand Dark Matter, and are looking for new ideas from theoretical physicists.
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: Petrochemicals on 01/02/2020 11:23:00
Quote from: OP
Given that dark energy seems to be constant ass the universe expands, could it be that dark matter
At present, Dark Matter and Dark Energy are thought to be entirely different phenomena


That about says it all, know one knows, it is just as possible dark stuff is the residence of god!
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: acsinuk on 10/02/2020 07:40:07
I think that dark energy is the electrostatic repulsion force of stars from each other and is 26 times stronger than the force of mass attraction. 
Dark matter is the magnetic attraction force of anti-matter stars or suns to their rotating planetary material.  The magnetic field that bonds sun to planets also rotates the planets due to the magnoflux spin effect
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: Kryptid on 11/02/2020 14:26:37
I think that dark energy is the electrostatic repulsion force of stars from each other and is 26 times stronger than the force of mass attraction. 

Stars are electrically neutral (or close to it), so there is no such electrostatic repulsion.

Dark matter is the magnetic attraction force of anti-matter stars or suns to their rotating planetary material.

When were any antimatter stars discovered?

The magnetic field that bonds sun to planets also rotates the planets due to the magnoflux spin effect

Gravity is responsible for holding planets around their stars, not magnetism. The fact that Kepler's equations work show that (as well as the fact that the magnetic field strength of a planet has no discernible impact on its orbital period).
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: Janus on 11/02/2020 18:18:32
I think that dark energy is the electrostatic repulsion force of stars from each other and is 26 times stronger than the force of mass attraction. 
Dark matter is the magnetic attraction force of anti-matter stars or suns to their rotating planetary material.  The magnetic field that bonds sun to planets also rotates the planets due to the magnoflux spin effect
Electrostatic charges are both positive and negative, with opposites attracting.   For repulsion, you need Negative-Negative or Positive-Positive.  The problem is that you are not going to get larger bodies like stars to ever have a strong charge in either direction. For, as you said electromagnetic repulsion is stronger than gravity, meaning that that star made predominately of one type of charge would never hold together or form in the first place.  Once a star began to form a significant charge, it would begin to repel like charges and attract the opposite ones, tending to neutralize its charge.

Anti-matter stars, even if they existed, can't be the source of dark matter.  They would glow just like regular matter stars (from their light alone, you would be hard pressed to tell the difference), and in order for dark matter to have the effects we observe, it has to spread out into areas outside of the visible disk of the galaxy.  It's not just about having more mass, it's about how that mass is distributed, and dark matter is distributed to areas where we detect nothing via the electromagnetic spectrum.
Title: Re: Is it possible that dark matter is a by-product of the combustion of stars?
Post by: evan_au on 11/02/2020 20:45:12
Quote from: acsinuk
anti-matter stars
Astronomers have searched for antimatter stars or antimatter galaxies, and concluded that there is no such thing in the part of the universe we can see.
- This is because the antimatter would annihilate with the "normal" matter in our part of the universe, producing a very visible flood of gamma rays

In fact, the amount of antimatter in our part of the universe is very small, mostly consisting of Anti-electrons (positrons), produced in:
- the decay of some unstable isotopes
- jets from black holes
- High-energy physical processes like cosmic rays
- High-energy physics labs like the LHC
- They don't last very long once they hit "normal" matter

Why there should be such an imbalance between matter and antimatter is one of the unsolved problems in physics.
See: https://en.wikipedia.org/wiki/Baryon_asymmetry

PS: There is still some debate among physicists about whether the neutrinos produced in nuclear fusion are the antiparticle of neutrinos produced in nuclear fission, or whether they are the same particle. Not that it matters much to the average person - neutrinos don't interact much with matter (or each other).