I think that the only state that time stand still is at 0K. Zero K is not what you get in a compressed state (i.e. low entropy) - rather the opposite. I would say that when density -> infinity, time passes infinitely quick. At inflation which is a decompression, temperature lowers and entropy increases and time slows down. Does c change as universe get older - can more than one answer exist depending on reference system?
Didn't we agree on that time don't exists? 🙂
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Didn't we agree on that time don't exists? 🙂
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Re the state of the universe pre Big Bang - IIRC Steven Weinbergs ‘The First Three Minutes’ the initial state at the onset of inflation was that only photons existed. As we have said, time does not pass for a photon. I don’t know, but this might explain how inflation took place. Since no time was passing while only photons existed there perhaps wouldn’t be any constraint at the rate at which the universe expanded. As soon as it cooled and other particle’s started to coalesce out of the super hot plasma, inflation stopped and it entered the entropic phase.
Dunno. Just some ramblings.
Dunno. Just some ramblings.
I'd like to see some hypotheses around this. If time and entropy aren't directly related in a cause-and-effect relationship, is there some third things that causes them both? Or are there two things, one causes time and the other entropy?
If I keep throwing questions against the wall, one's bound to stick ...🙂
What happened pre Big Bang is the Big Question. A majority now agree that cosmic inflation came before the Big Bang rather than after it.
The hot Big Bang should not be extrapolated back to a singularity, but only to the end of an inflationary state that preceded it. Cosmic inflation was the beginning of the universe, not the Big Bang!
It is postulated that, in the beginning, all the energy did not reside in particles or radiation but in the fabric of spacetime itself! During inflation, this energy transformed into matter, antimatter, and radiation - creating the universe we see today.
And, as member NightFlight may be interested to know, it's quite possible that other Big Bangs occurred elsewhere in the inflating Universe!
From where do I get this viewpoint? Simple, I asked Ethan! 😎 According to him "In order to understand and visualize (an inflationary universe) we have to put our intuition aside, and embrace a reality where the only energy that matters is the energy intrinsic to the fabric of space itself."
https://www.forbes.com/sites/starts...-was-it-like-when-the-universe-was-inflating/
OK, inflation should have been quite a bang 🙂 If the BB was after the inflation - what did the BB consist of? Forming of solid things?
"A majority now agree that cosmic inflation came before the Big Bang rather than after it." + "During inflation, this energy transformed into matter, antimatter, and radiation - creating the universe we see today." = ?
So no BB ;-)
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"A majority now agree that cosmic inflation came before the Big Bang rather than after it." + "During inflation, this energy transformed into matter, antimatter, and radiation - creating the universe we see today." = ?
So no BB ;-)
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🙂
During inflation, this energy transformed into matter, antimatter, and radiation - creating the universe we see today
So no BB - yet? :-D
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During inflation, this energy transformed into matter, antimatter, and radiation - creating the universe we see today
So no BB - yet? :-D
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Cosmic Reheating, says Ethan, put the Bang in the Big Bang!
Cosmic reheating is the link between the inflationary period and the Big Bang.
Cosmic reheating transformed the energy, which had previously been inherent in the fabric of space itself, into particles, antiparticles and radiation. That transition is what put the "bang" in the hot Big Bang, and led to the birth of the observable Universe as we know it.
https://medium.com/predict/linking-...e-big-bang-with-reheating-period-1eb3f81526a1
Cosmic reheating is the link between the inflationary period and the Big Bang.
Cosmic reheating transformed the energy, which had previously been inherent in the fabric of space itself, into particles, antiparticles and radiation. That transition is what put the "bang" in the hot Big Bang, and led to the birth of the observable Universe as we know it.
https://medium.com/predict/linking-...e-big-bang-with-reheating-period-1eb3f81526a1
Cant see the dolls 🙂 - from your link:
"During this initial period of cosmic inflation — which lasted less than a trillionth of a second — the matter in the universe inflated exponentially quickly before the slower process of the Big Bang took over." (My highlight)
And some "reheating" in between. Cool! (PI)
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"During this initial period of cosmic inflation — which lasted less than a trillionth of a second — the matter in the universe inflated exponentially quickly before the slower process of the Big Bang took over." (My highlight)
And some "reheating" in between. Cool! (PI)
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Galu
that makes sense. Rapid inflation because there is no time (so no c limit) and then the BB where entropy is the dominant regime.
that makes sense. Rapid inflation because there is no time (so no c limit) and then the BB where entropy is the dominant regime.
There’s a lot of chatter about entropy, gravity, and a little less about time around but still no break through. Hypotheses are cheap - it’s proving it that is the difficult challenge! Sabine Hossenfelder has pointed that there are hundreds of academic theories attempting to unify QM and GR and related stuff, but not one is without major flaws.
Onward and upward.
Yes, when we talk about "the hot Big Bang", we mean the very first moment that the Universe could be described by a particle, antiparticle and radiation-filled state.
The inflationary state that led to this hot Big Bang state is not explainable in terms of the physics that you or I currently understand. The hypothesis that the energy inherent in space itself was transformed into matter, antimatter and radiation must, we are told, be taken on trust!
However, from then on things get easier as the physics that we do currently understand takes over.
It is from the hot Big Bang state that the Universe begins expanding and cooling according to the laws of General Relativity, heading down the path towards matter/antimatter annihilation, the formation of atomic nuclei, then neutral atoms, and ultimately the formation of stars and galaxies.
Before that . . . no time, no entropy and no limit on c.
A strange and unfathomable epoch.
I will have to go back and re-read Steven Weinberg's 'The First Three Minutes' - highly recommended.
A strange and unfathomable epoch.
I will have to go back and re-read Steven Weinberg's 'The First Three Minutes' - highly recommended.
So will this telescope be limited the same way as the Hubble in that there is only a tiny window through which we can see past the Milky Way?
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