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Re: What is Twistor Theory? | Roger Penrose AND What came before Big Bang? Why he changed his mind. 

By: Zimbler0 in GRITZ | Recommend this post (1)
Sun, 08 Jun 25 3:59 AM | 8 view(s)
Boardmark this board | Grits Breakfast of Champeens! 		Msg. 09334 of 09339
(This msg. is a reply to 09329 by De_Composed)
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Graviton >
In theories of quantum gravity, the graviton is the hypothetical elementary particle that mediates the force of gravitational interaction. There is no complete quantum field theory of gravitons due to an outstanding mathematical problem with renormalization in general relativity. In string theory, believed by some to be a consistent theory of quantum gravity, the graviton is a massless state of a fundamental string.


Decomposed > Before 10^-43rd of a second, there were no residual gravitons. It was still too hot. So why does Penrose talk about the effect of gravity on the pre-Big Bang universe?


So . . . .
A Graviton is a 'hypothetical elementary particle' . . . Suggesting that it might not even exist.

And we got one school of thought regarding pre-Big Bang Gravity and another that there could be no gravity because there were no gravitons . . .

Riddle me this . . How can one go from a 'point in space' with no matter to this 'Big Bang' vomiting all manner of matter components - enough to make a Universe worth of matter . . . ? ? ?

Zim.




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The above is a reply to the following message:
Re: What is Twistor Theory? | Roger Penrose AND What came before Big Bang? Why he changed his mind.
By: De_Composed in GRITZ
Sat, 07 Jun 25 11:37 PM 		Msg. 09329 of 09339

fizzy:

Re: “2:30 He explains that gravitons can spin left...but not right handed.”Very interesting post, fizzy. I thought it was odd that Penrose talked about gravity within the pre-universe, with the Standard Model describing a preliminary state which had to have been very, very, VERY hot with particles constantly popping into existence as mirrored pairs (even as some do today, they think) and promptly annihilating one another.

The Standard Model conjectures that we owe the particles that remain to the rapid expansion/cooling that came after the Big Bang. Particles formed in conditions of tremendous heat and pressure (and vary greatly in how much heat and pressure they need). As the new universe quickly expanded and cooled, there were points where various particles were permanently frozen into existence, never to be created again but also unable to annihilate if their partner had not formed when the freezing took place. In the case of gravitons, this happened when the universe had an average energy level of about 10^32° Kelvin. Gluons, which are thought to mediate the strong force, were frozen into existence at 10^28°. Photons, which mediate the electromagnetic force, were frozen into existence at 10^15°. W and Z bosons gave us the weak force at 10^12° Kelvin.

And this occurred in the first 1/10,000th of a second following the Big Bang. It was a happenin' place!

Before 10^-43rd of a second, there were no residual gravitons. It was still too hot. So why does Penrose talk about the effect of gravity on the pre-Big Bang universe? No gravitons = no gravity, right? I'm sure he's got an explanation.

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