All Questions
5
questions
4
votes
2
answers
271
views
How did the big bang's low entropy (which comes from gravity) get converted to sunlight?
In many places you will read that just after the big bang, the universe was filled with very hot gas which appeared to be in thermal equilibrium. You will then read that this is actually quite a low ...
- 2,070
2
votes
0
answers
158
views
How could the universe's expansion "remove the mean gravitational potential"?
I'm citing W. C. Saslaw's The Distribution of the Galaxies: Gravitational Clustering in Cosmology, chapter 25, where he adresses (what seems to be a Newtonian approximation of) the thermodynamic ...
- 2,463
14
votes
2
answers
874
views
Has Verlinde's theory made significant advance recently?
In 2010-2011, Verlinde's theory for explaining gravity as emergent from thermodynamics started to get known in the physics community.
It was (and seemingly still is) lacking evidence, and faced ...
- 4,256
2
votes
1
answer
424
views
If the Big Bang started in a state of low entropy then shouldn't the Big Crunch be in a state of low entropy also?
I recently read that:
What our current level of thermodynamics does tell us though is that if there is such a thing as a Big Crunch, the universe will look a lot different as it heads towards ...
- 2,470
0
votes
0
answers
113
views
Singular isothermal density distribution
Does anyone know where the Singular isothermal density distribution
$$
\rho(r)=\frac{\sigma_{V}^{2}}{2\pi\,G\,r^{2}}
$$
or how it was derived. Are there any good references on how this equation was ...
- 789