I support the proven part of the bigbang theory, but why did time begin to exist only with the beginning of the expansion?

The question is: considering that energy is not spent or lost, but exchanged and that everything that exists is within the expanding Universe at every instant! Since there is never anything outside the universe, that is, nothing that can exchange energy with it, wouldn't it be necessary to conserve its total energy? In other words, wouldn't the universe have to exist in constant mutation, exchanging its internal energies with its expansion and exist forever? How can existence end or come out of nowhere?
How does a cosmology explain this energy issue?
 

Catastrophe

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There are various ideas about an open or closed Universe and ideas we know about includng a cyclic Universe.
Talking about energy, one suggestion is that all forms of energy ultimately degrade into heat, and one idea is that the heat (i.e., motion) just gets cold (stops).
That is the thing about cosmology - it is all wonderful speculation and no proof - or is it?

My take on the Big Bang is well known. I like a nexus, a continuum on either side, approached asymptotically with no singularity.

Cat :)
 
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[QUOTE = "Catástrofe, postagem: 536789, membro: 1109827"]

OK! I was just asking to provoke an argument! The idea was this: if everything that exists is in the Universe, it will become the only naturally isolated system, even in expansion! That is, it cannot do work when expanding! Because energy is not spent, it is exchanged! If there is nothing at every instant outside the Universe, because when expanding, part of the exterior it becomes part of the Universe itself, it has no external existence to exchange energy with it! so the universe always has to conserve his energy! I'm in an international cosmology group, you needed to know in the fight that this discussion took place! Discussion of a simple argument! Most of the other group supported me, in a discussion I had to show someone else that the energy-momentum vector in certain cases could make the conservation of the Universe possible! There was another person who said that he had published an article and that he was known worldwide saying that temporal asymmetry, citing matter and anti-matter, prevented the conservation of total energy! I replied to he: that he didn't need to argue in such a complicated way to say that entropy in the Universe always increases! I said that he had to revise its content because the entropy did not depend only on the distribution of mass and energy, but also on the extension of the existing space! The other person was without an argument! You needed to see what a mess it was!

Gato :)
[/CITAR]
 

IG2007

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I'm in an international cosmology group, you needed to know in the fight that this discussion took place
We all are in a space forum...

Now, jokes apart, according to BBT, yeah, it is true that time began to exist since big bang. I guess, it is just a postulate for the sake of the BBT. You see, the BBT makes a lot of surmises and assumptions, a majority of them matches reality, exempli gratia, the Cosmic Microwave Background or the CMB, but yes, it has also been tweaked a little bit here and there to adhere to reality. But the BBT theory is pretty same the present day as it was almost 70 years ago.

In my opinion, it simply does not matter if time existed or not before the Big Bang, because there was no matter before it and therefore no quark or even an energy wave before the Big Bang, so there is nothing relative to anything, and therefore t=0 and therefore it does not matter.

Another point, "Cat" is simply a short form of "Catostrophe" :)
 
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We all are in a space forum...

Now, jokes apart, according to BBT, yeah, it is true that time began to exist since big bang. I guess, it is just a postulate for the sake of the BBT. You see, the BBT makes a lot of surmises and assumptions, a majority of them matches reality, exempli gratia, the Cosmic Microwave Background or the CMB, but yes, it has also been tweaked a little bit here and there to adhere to reality. But the BBT theory is pretty same the present day as it was almost 70 years ago.

In my opinion, it simply does not matter if time existed or not before the Big Bang, because there was no matter before it and therefore no quark or even an energy wave before the Big Bang, so there is nothing relative to anything, and therefore t=0 and therefore it does not matter.

Another point, "Cat" is simply a short form of "Catostrophe" :)
I agree with BigBang (the proven part) But at the instant of the expansion, the universe has to be static to start the expansion! Practically without spaces, without energy (propagation) The universe would have to have a massive constituent in order to exist a potential energy that represents its total energy, since it does not have kinetic energy or particles to use quantum physics or atomic energy! Energy is never created or lost (spent), but exchanged! (my opinion)!
 
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Catastrophe

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In the idea that I like, "at the instant of the expansion, the universe has to be static to start the expansion! " my suggestion is that there is an asymptotic or parabolic situation in the nexus, and a point of inflection suggests "static" with respect to something e.g., y axis.

Catastrophe :)
 
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In the idea that I like, "at the instant of the expansion, the universe has to be static to start the expansion! " my suggestion is that there is an asymptotic or parabolic situation in the nexus, and a point of inflection suggests "static" with respect to something e.g., y axis.

Catastrophe :)

"There never was a good war, or a bad peace" Are you saying all wars are bad or unnecessary?
 

Catastrophe

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IG2007

"Don't criticize what you can't understand..."
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In the idea that I like, "at the instant of the expansion, the universe has to be static to start the expansion! " my suggestion is that there is an asymptotic or parabolic situation in the nexus, and a point of inflection suggests "static" with respect to something e.g., y axis.

Catastrophe :)
That's exactly what I meant to say! Cat, thanks for making it so precise! :)
 
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Ancient One,
"Quotes - There never was a good war, or a bad peace.
https://www.shmoop.com › quotes › never-good-war-o..."


"There never was a good war, or a bad peace." · Context. This line was written by Benjamin Franklin in a letter to Sir Joseph Banks (July 27, 1983). · Where you've ..."

It is a quotation. Best ask Benjamin Franklin.

Perhaps your question comes into the "bad peace" part?

Cat :)

Ben should have phrased it in terms of necessary wars/peace' & unnecessary wars & peace'. Who would ever want war, when it is unnecessary? I suppose it depends on your vantage point(s)/perspective/side. They say the winners write the history books. I'm just glad my side wrote most of the books (including history) I read. I thank the powers that be for NASA, & the US military, among other things. These are a few of my favorite things. :) My dad was USAF, 1950-54.

Old soldiers never die,

...
 
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Catastrophe

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Ben should have phrased it in terms of necessary wars/peace' & unnecessary wars & peace'. Who would ever want war, when it is unnecessary? I suppose it depends on your vantage point[s)/perspective/side. They say the winners write the history books. I'm just glad my side wrote most of the books (including history) I read. I thank the powers that be for NASA, & the US military, among other things. These are a few of my favorite things. :) My dad was USAF, 1950-54.

Old soldiers never die,

...
Did #8 help?
 

Catastrophe

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Ancient One:

Post #8 above.

Quote
It is a quotation. Best ask Benjamin Franklin.
Perhaps your question comes into the "bad peace" part?
Quote

Cat :)
 

rod

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"I support the proven part of the bigbang theory..." What is the *proven part*? For example, starting point at Planck time, Planck length? Inflation epoch? Post-inflation universe? BBN? CMBR origin? Cosmic dark age, Primordial gas clouds, Population III stars, etc.? Age of the universe (Hubble time), is this a *proven part*? I could also add here the primordial abundances of H, He, and Li.
 
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