All Questions
Tagged with universe temperature
32
questions
-2
votes
4
answers
98
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In a universe with no photons, will everything necessarily be at absolute zero temperature?
Imagine a universe governed by the same physical laws as ours, i.e., the same fundamental forces, with the only caveat that there are no photons, hence no electromagnetic radiation in this universe. ...
- 127
0
votes
2
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39
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Can we measure temperature in an isothermal Universe?
It is envisaged that ,in the future ,Universe can end in a big freeze, where there will be no energy gradient. It is also theorised that Universe was isothermal(with some irregularities I guess) in ...
10
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6
answers
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Why do we say that temperature of Universe is around 2.7 K?
I am little confused, so please correct me if I am wrong.
Temperature of Universe is calculated using cosmic microwave background and it is around 2.7 K.
The cosmic microwave background is the relic ...
-1
votes
1
answer
138
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Is there an upper limit to temperature in the universe?
The Sun's core temperature has been modelled to be $\approx 1.57 \times 10^7$ K
In supernovae:
"In lower mass cores the collapse is stopped and the newly formed neutron core has an initial ...
- 1,307
1
vote
1
answer
55
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How hot is a primordial black hole and does it has angular momentum?
I am fascinated by these elusive phenomenon, they are formed in the early stage of the universe where it is not homogeneous and some regions are very dense enough to undergoes gravitational collapse. ...
- 13k
4
votes
4
answers
267
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Does an expanding universe cool down?
I want to know if and why the temperature of an expanding universe decreases with time.
Universe setup. My universe is modeled as the manifold $]0,\infty[\times\mathbb T^3$, where $$\mathbb T^3 = (\...
2
votes
2
answers
110
views
Will a neutrino gas always stay at the same temperature?
Does the neutrino gas pervading the universe always have the same temperature? Does it still have the temperature as the neutrino gas that emerged from the big bang? Neutrinos don't interact, so how ...
2
votes
1
answer
46
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How can we talk about a single temperature if the early universe was in local thermal equilibrium?
If the early universe was only in local thermal equilibrium, how can we talk about a single temperature for the whole universe?
- 11.8k
0
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1
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152
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How to define a temperature for the early Universe?
The concept of a temperature $T$ is routinely used in discussing the thermodynamics of the early Universe. It enters the discussion via equilibrium phase space distribution of various particles that ...
- 11.8k
22
votes
3
answers
4k
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Is the temperature of the universe rising?
I know the temperature of the universe is decreasing due to it's expansion after the big bang but after I came up with this article in AOP(please note I don't have the access of the journal,so I have ...
- 578
22
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3
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7k
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How do scientists know the min limit of temperature is -273 degree celsius?
How do scientists know the min limit of temperature is -273 degree celsius?
I wonder how do scientists confirmed that there is no place belong to less than -273 degree celsius in the universe? Why the ...
0
votes
1
answer
1k
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Is this formula for the time-temperature relation in this universe correct, or is there a more appropriate one?
I'm trying to simplify an equation into a form that uses the ratio of the number density of sterile to active neutrinos.
For this, I need a relation between the time and temperature of the universe, ...
- 753
2
votes
2
answers
481
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Particle decoupling during Universe's evolution
Studying cosmology, I've seen that when you want to calculate the number of degrees of freedom of the thermal bath before and after the decoupling of some species, it is used the mass of that particle ...
- 1,597
3
votes
1
answer
259
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How to assign a temperature and a time to cosmic events in the universe?
Sorry if this question to too silly for the experts here. But how do cosmologists assign a temperature and a time to each important cosmic event in the history of evolution of the universe such as ...
- 11.8k
3
votes
2
answers
1k
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How bright was the universe after Big Bang during photon epoch?
After 10 seconds of Big Bang, most of the leptons and antileptons annihilate each other leading to an outburst of photons. The universe was said to be dominated by photons resembling a glowing fog. ...
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