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Physics, Astronomy & Cosmology / When will quantum supremacy be achieved?

« on: 16/03/2019 14:42:52 »

The date seems to have slipped through 2017 and 2018.
Could 2019 be a possibility?

2

Physics, Astronomy & Cosmology / Re: Do you think we are alone in the Milky Way?

« on: 02/03/2019 16:36:44 »

Susan Schneider, an associate professor of cognitive science at the University of Connecticut says “I’m actually concerned that technological civilizations may not last long, but if they do, there are a lot of reasons to believe they’ll be post-biological artificial intelligence".

Schneider considers that they are already out there and have been for eons.
The age of our solar system is about 4.5 billion years. Earth-like planets have been discovered around stars which are 10.5 billion years old so they will be 6 billion years ahead of Earth.

3

New Theories / Could our universe have an antimatter partner?

« on: 10/01/2019 08:02:24 »

Neil Turok and his colleagues at the Perimeter Institute for Theoretical Physics are suggesting that an anti-universe before the Big Bang when time ran backwards and was dominated by antimatter instead of matter.

They say it naturally explains the existence of dark matter.

4

Physics, Astronomy & Cosmology / Why did Einstein think we are we all wrong?

« on: 31/12/2018 17:21:59 »

Towards the end of his life, Einstein said
"All these years of conscious brooding have brought me no nearer to the question - what are light quanta? Every Tom, Dick and Harry thinks he knows it but he is mistaken.''

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Physics, Astronomy & Cosmology / Re: Why do we have two high tides a day?

« on: 23/12/2018 23:17:09 »

Is this the answer?

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New Theories / Re: How is the quantum double slit experiment set up?

« on: 17/12/2018 11:56:06 »

Five questions there. I have never seen a plausible answer to most of them.

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Physics, Astronomy & Cosmology / Re: Could dark matter and dark energy be unified into a single phenomenon?

« on: 15/12/2018 10:38:42 »

From what you are saying, awaiting confirmation by the Square Kilometre Array, is not analogous to Eddington's 1919 confirmation of Einstein's General Relativity.

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Physics, Astronomy & Cosmology / Re: Could dark matter and dark energy be unified into a single phenomenon?

« on: 10/12/2018 17:12:15 »

Dr. Farnes says: "Previous approaches to combining dark energy and dark matter have attempted to modify Einstein's theory of general relativity, which has turned out to be incredibly challenging. This new approach takes two old ideas that are known to be compatible with Einstein's theory—negative masses and matter creation—and combines them together.
"The outcome seems rather beautiful: dark energy and dark matter can be unified into a single substance, with both effects being simply explainable as positive mass matter surfing on a sea of negative masses."
Proof of Dr. Farnes's theory will come from tests performed with a cutting-edge radio telescope known as the Square Kilometre Array (SKA), an international endeavor to build the world's largest telescope in which the University of Oxford is collaborating.


Read more at: https://phys.org/news/2018-12-universe-theory-percent-cosmos.html#jCp

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Physics, Astronomy & Cosmology / Could dark matter and dark energy be unified into a single phenomenon?

« on: 10/12/2018 14:28:52 »

Published in Astronomy and Astrophysics, by Dr. Jamie Farnes from the Oxford e-Research Centre, Department of Engineering Science, offers a new explanation. Dr. Farnes says: "We now think that both dark matter and dark energy can be unified into a fluid which possesses a type of negative gravity, repelling all other material around them. Although this matter is peculiar to us, it suggests that our cosmos is symmetrical in both positive and negative qualities.

10

Physics, Astronomy & Cosmology / Re: Why do we have two high tides a day?

« on: 19/10/2018 15:11:03 »

This thread is almost as long-winded as the MH370 disappearance on the pilot's forum.

11

Physics, Astronomy & Cosmology / Which force is stronger...gravitation or dark energy?

« on: 12/06/2018 20:09:03 »

Galaxies collide but the expansion of the universe accelerates. This appears counterintuitive like a lot of cosmology and quantum mechanics.

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Physics, Astronomy & Cosmology / Re: Is dark energy real?

« on: 19/03/2018 15:40:51 »

This is the source -  https://doi.org/10.1093/mnras/stx1858
I am getting 'no follow' after my link due to the number of posts I have made.

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Physics, Astronomy & Cosmology / Is dark energy real?

« on: 19/03/2018 10:06:18 »

The accelerating expansion of the universe due to a mysterious quantity called “dark energy” may not be real, according to research claiming it might simply be an artefact caused by the physical structure of the cosmos.
The findings, reported in the Monthly Notices of the Royal Astronomical Society, claims the fit of Type Ia supernovae to a model universe with no dark energy appears to be slightly better than the fit using the standard dark energy model.

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Physics, Astronomy & Cosmology / Will humans ever understand quantum physics?

« on: 14/03/2018 17:44:15 »

In the same way that chimpanzees will never understand classical physics, have humans just not got the intellectual capacity to understand quantum mechanics?

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Physics, Astronomy & Cosmology / Re: What is the source of gravity?

« on: 20/02/2017 09:04:34 »

Quote from: PmbPhy on 27/12/2016 23:23:27The source of gravity is mass. To be precise its active gravitational mass. The mass generates a gravitational field and the field exerts a force on whatever is in the field. The mechanism to do this is currently unknown. All we know is how it works, not why it works. Anybody like to speculate why it works?
                           

So many things in this weird world/universe that we know how it works but not why it works.

This last hundred years or so has been a most exceptional period of advancement, even rivaling the introduction of the printing press in the 15th century. We have achieved so much and we are on the brink of so much more.


I would dearly like to hear more of the why rather than the how.

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Physics, Astronomy & Cosmology / Re: Time dilation and Relativity. Really?

« on: 08/02/2017 10:42:35 »

 I trained as a chemist (now I wish I had taken up physics) so I may not have completely understood you.

Surely B can't move faster than A and C can't move faster than B. So the situation can't occur.

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Physics, Astronomy & Cosmology / Re: What is the source of gravity?

« on: 07/02/2017 19:49:48 »

The source of gravity is mass. To be precise its active gravitational mass. The mass generates a gravitational field and the field exerts a force on whatever is in the field. The mechanism to do this is currently unknown. All we know is how it works, not why it works.

Anybody like to speculate why it works?

18

Physics, Astronomy & Cosmology / Re: Does a microwave use the same amount of energy for all food?

« on: 07/02/2017 19:46:26 »

Bit off topic, but why does the plate rotate in the oven? I always understood the magnetron projected its power downwards in concentric circles. (I saw a demo with cheese on a plate being melted as a method of measuring the speed of light), so I would have thought rotating the plate would not alter the distribution of the energy. It would still be in concentric bands.

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Physics, Astronomy & Cosmology / Re: If Energy is neither created nor used up, where did energy come from?

« on: 31/05/2016 21:31:00 »

This question is worst than "Do dark energy/dark matter really exist?

Surely it's in the category of "we will never find out".

20

Physics, Astronomy & Cosmology / Re: Is there life after death?

« on: 31/05/2016 21:17:40 »

I for one do not believe there is life after death. But if it were so then I would expect it would be forever.

Life after death offered as the ultimate reward but would we really want it. I remember the phrase from “Old Man River” – tired of living, feared of dying.

Humans have evolved for millennia with a belief in an after life. Why this is so can only be speculated on.