Questions tagged [big-bang]
According to the current cosmological theories, it's the model that explains the early life of the universe, starting from a rapid expansion of hot and dense matter.
1,153 questions
2 votes
1 answer
185 views
Is Big Crunch time reversed Big Bang - before it there would be formed black or white holes?
Big Crunch is often presented as time reversed Big Bang, e.g. https://www.sciencealert.com/physicists-predict-when-the-universe-will-end-in-a-reverse-big-bang I wanted to ask how true is it especially ...
- 1,196
11 votes
1 answer
1k views
Can Spacetime bend itself?
If spacetime can bend due to gravity, could too much energy in one point make it collapse and then expand again like the Big Bang? Can spacetime bend due to gravity?
user555744
4 votes
4 answers
1k views
Could the Big Bang be nothing more than the natural behavior of gravity in general relativity?
I'm currently taking a course in GR, and while perusing the cosmology section of my textbook, something occurred to me. Einstein’s field equations admit dynamical FLRW solutions in the presence of ...
3 votes
2 answers
163 views
Gravity at Initial Universe Creation Point $t_0$
Did gravity exist at our universes' $t_0$ (initial singularity)? Or, did gravity only exist after Mass was established with the creation of the Higgs Boson? What period of time was there between $t_0$ ...
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0 votes
1 answer
85 views
Do Black Holes lead to Oscillating Universe? [closed]
I recently read about the Hawking Radiation. As of what I comprehended is: It is the escape of one of the pair of entangled particles created just at the event horizon from "empty" space. ...
0 votes
0 answers
78 views
On bounces and different theories of "microscopic" physics?
In theoretical physics and cosmology there is a model of the universe which is the big bounce. This results in bouncing universes that undergo sequential cycles of expansion and contraction. Normally, ...
- 3,374
20 votes
3 answers
2k views
What happened to all of the energy created at the Big Bang when the matter and antimatter annihilated each other?
Supposedly, at the moment of 'Creation', only a billion-and-one or a-billion-plus-two matter particles were created for every billion antimatter particles. Then, the vast majority of both proceeded ...
- 5,035
0 votes
4 answers
646 views
Could some objects survive Big Bounce e.g. now seen with these extreme redshifts by JWST?
There are recent claims for observations of up to redshift 25 objects by JWST, which are said too early to be formed by standard Big Bang models, e.g. https://www.scientificamerican.com/article/the-...
- 1,196
0 votes
2 answers
131 views
When we look at the start of the universe, are we looking at particles that could become us? [closed]
Suppose we had the time and ability to track one particle from the start of the universe until now. Suppose that particle is currently part of earth. We would watch it over billions of years, and see ...
2 votes
0 answers
76 views
How should PM compare to Zeldovich approximation before shellcrossing in 2D with plane waves? [closed]
I attempted to do a N-body-simulation and compare it to the analytical Zeldovich map until shell-crossing appears. In order to do so, I placed them uniformly with the Zeldovich initial condition, e.g ...
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2 votes
0 answers
187 views
Is the Big Bang the source of all energy in the universe?
I originally was wondering how gravity is able to just pull things together, as work requires energy. I've read other threads that explain this as gravity is a force, not energy, and in order for ...
- 139
0 votes
1 answer
222 views
The Big Bang and the expansion of the Universe: in what space-time? [duplicate]
If the Universe is understood as the "container of everything", including all space and time, then how does modern physics describe the Big Bang and the expansion of the Universe? In what ...
- 19
2 votes
1 answer
187 views
Why didn't the universe immediately annihilate after the Big Bang? [duplicate]
If the Big Bang created matter and antimatter in equal amounts, how come the entire universe didn't just annihilate into nothingness? Why is there more matter and only a little bit of antimatter?
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1 vote
1 answer
235 views
Are all particles entangled since everything was once one then separated by the so-called Big Bang? [closed]
If you must have two or or more particles together in order to entangle them.
- 35
8 votes
3 answers
293 views
Why is the CMB difficult to explain in the Steady State Theory?
I'm reading A Course in Cosmology by Dragan Huterer who in the first chapter talks about the three pillars of Hot Big Bang Cosmology: the Hubble Expansion, the CMB, and the abundance of lightest ...
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