Graviton? Or no graviton?

[JirinPanthosa]

I thought physicists already thought there weren't any 'Gravitons' and that gravity was caused by the curvature of space time around mass.

In my unprofessional quasi-informed speculation, I wonder if dark energy is a result of space being more compact being a higher energy state, so the expansion of space releases that energy as it expands.

I've seen theories that the 3d nature of observable space is related to the way gluons matrix.

 

[JirinPanthosa]

Technically speaking, we will NEVER know everything for certain. You simply can't.

Did the Universe start with a "Big Bang" or a "Big Bounce" or..? The only way to be sure would be to travel back in time - which I doubt will ever be possible plus, even if you could...would you be able to exist in the conditions at the moment of the event?!? Nope...

That's the problem with being able to truly know how everything began.

Our entire method of investigation is linking cause to effect. Show that cause implies effect, view the effect, posit the cause. Proving how the universe began would mean having an effect without a cause.

 

[Asbo Zaprudder]

I thought physicists already thought there weren't any 'Gravitons' and that gravity was caused by the curvature of space time around mass.

General Relativity doesn't have gravitons but they are needed if one attempts to quantise the theory - that's a requirement of quantum field theory. As the stress-energy tensor is of order 2, the graviton must be a spin-2 field boson and such a particle is a prediction of String Theory - one of the reasons why it has been in vogue for so long as the best bet for formulating a theory of everything. Unfortunately, no-one has managed to come up with a satisfactory way of avoiding the mathematical infinities that arise when quantising General Relativity.

In my unprofessional quasi-informed speculation, I wonder if dark energy is a result of space being more compact being a higher energy state, so the expansion of space releases that energy as it expands.

As I mentioned in an earlier post, some people have doubts that dark energy exists at all. I have wondered if it's somehow related to the inflaton field that was prevalent in the very early universe. There are doubts that such a field can just turn off and it is suspected that inflation is happening continuously in parts of the cosmos beyond the visible horizon as a continuous big bang.

I've seen theories that the 3d nature of observable space is related to the way gluons matrix.

I have no idea what this means. I didn't know matrix could be a verb.

That's the problem with being able to truly know how everything began.

Our entire method of investigation is linking cause to effect. Show that cause implies effect, view the effect, posit the cause. Proving how the universe began would mean having an effect without a cause.

A recent hypothesis by Julian Barbour posits that there was no beginning to time. In The Janus Point, he argues that the second law of thermodynamics has been misapplied and that the growth of order determines how we experience time. In his view, the big bang becomes the Janus point, a moment of minimal order from which time could flow, and order increase, in two directions. He proposes that the Big Bang was merely a very special configuration of the Universe, a configuration he terms the Janus point. Moving away from this point, the shape changes, marking the passage of time. He argues that the future lies in both directions - hence the reference to Janus, who was the two-faced Roman god of beginnings and transitions. I would suggest that the other universe might be the anti-matter counterpart of our own as the charge-flow arrow in Feynman diagrams is oppositely oriented for matter and anti-matter particles.

 

[JirinPanthosa]

You must not be a millennial if you're confused by using a noun as a verb.

I remembered it wrong, 'Flux tubes', not gluons.

https://www.seeker.com/space/astrop...xplains-why-the-universe-is-three-dimensional

Even if there was no beginning, to really understand everything you have to explain what set the entire thing in motion to begin with.

 

[Asbo Zaprudder]

That's a contradiction. If there was no beginning, you don't need a prime cause. Requiring a beginning is an anthropomorphic perspective.

Yes, knots require exactly three spatial dimensions as does gravity. Sounds very stringy again. Interesting idea but some testable predictions would help one to do some science.

Oh, and I guess I'm a boomer...

ETA: I suspect the reason for there being three families of leptons and of quarks is to do with topology and three large spatial dimensions but I have no further insight to offer as to why.

 

[rahullak]

A recent hypothesis by Julian Barbour posits that there was no beginning to time. In The Janus Point, he argues that the second law of thermodynamics has been misapplied and that the growth of order determines how we experience time. In his view, the big bang becomes the Janus point, a moment of minimal order from which time could flow, and order increase, in two directions. He proposes that the Big Bang was merely a very special configuration of the Universe, a configuration he terms the Janus point. Moving away from this point, the shape changes, marking the passage of time. He argues that the future lies in both directions - hence the reference to Janus, who was the two-faced Roman god of beginnings and transitions. I would suggest that the other universe might be the anti-matter counterpart of our own as the charge-flow arrow in Feynman diagrams is oppositely oriented for matter and anti-matter particles.

So you're saying there is a bizarro-mirror universe!

 

[Asbo Zaprudder]

So you're saying there is a bizarro-mirror universe!

I think there is possibly also a multiverse where each universe has an antimatter twin in which exactly the same events occur. Perhaps there are also left and right-handed versions of each universe. Our universe appears to be left-handed as weak interactions couple only to left-handed particles. It's a broken symmetry and I expect it could just as well have broken the other way as well.

Why Is The Universe Fundamentally Left-Handed? | by Ethan Siegel | Starts With A Bang! | Medium

 

[rahullak]

Where's the spore drive when you need it...

 

[publiusr]

Some news…it seems a simple tabletop experiment revealed the axial Higgs boson:

https://www.space.com/magnetic-higgs-relative-discovered
https://phys.org/news/2022-06-axial-higgs-mode-elusive-particle.amp

Now the axial Higgs has a magnet moment…which makes me think back to other finds:

https://room.eu.com/news/no-dark-energy-needed-just-dark-matter-with-a-magnetic-force-new-study-says
https://phys.org/news/2021-04-qa-brink-age-scientific-discovery.html
https://phys.org/news/2022-02-axion-dark.html

Maybe these finds will allow propellantless propulsion?

Helium-3 has magnetism
https://phys.org/news/2022-06-magnetic-properties-helium-.html

Thoughts on dark matter
https://www.space.com/dark-matter-existence-philosophy

We know that the standard model is incomplete…and I do seem to remember some interesting link about the Sun’s magnetic field and dark matter somewhere…

Optical gravity model
https://sciencex.com/news/2022-06-optical-gravity-geophysics-astrophysics-cosmology.html

Supposing that gravitons exist, the streams of gravitons being exchanged between the masses of the visible universe would immediately constitute a cosmic medium. To make this an optical medium simply requires that gravitons share at least some properties with photons or virtual photons. Gravitons could then serve as both the medium and the message in gravity and quantum physics.