
#19
Apr2511, 12:01 AM

P: 4

The universe is cooler today than it was right after the big bang




#20
Apr2511, 03:43 AM

Sci Advisor
P: 4,721





#21
Apr2611, 02:28 AM

P: 4

Right, so my question was could that temperature be inversely proportional to the distance of spacetime? The universe is cooling and expanding. Also, as an object approaches the speed of light, distances contract. The mass(potential energy) of matter can affect the shape of spacetime, so the temperature(kinetic energy) of matter in spacetime may also affect its shape.




#22
Apr2611, 04:31 AM

Sci Advisor
P: 4,721

And while the photons are obviously still relativistic (they are relativistic at any temperature), their total energy density is only a tiny fraction of the energy density in matter, so that their effect on the curvature of spacetime is minimal. 


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