Register to reply

In <Cosmology> written by Weinberg, in page 109

by nadia8999
Tags: cosmology, weinberg
Share this thread:
nadia8999
#1
Jul26-11, 12:14 AM
P: 10
In <Cosmology> written by Weinberg, in page 109, it says that

[itex]\epsilon=\alpha_{B}T^4+\frac{3}{2}n_{B}Nk_{B}T[/itex]
[itex]p=\frac{1}{3}\alpha_{B}T^4+n_{B}Nk_{B}T[/itex]

[itex]\alpha_{B}T^4[/itex]is the average energy density of black-body radition, then what does [itex]\frac{3}{2}n_{B}Nk_{B}T[/itex]means? the energy density of non-relativistic particles? If so, then should the press of non-relativistic particles be zero in the second equation?
Phys.Org News Partner Science news on Phys.org
Pilot sites in energy from coffee waste show good results
Startups offer banking for smartphone users
Factor in naked mole rat's cells enhances protein integrity

Register to reply

Related Discussions
Up to date cosmology textbook, >Linder, <Weinberg? Science & Math Textbooks 4
Question from Weinberg's cosmology text Special & General Relativity 5
Cosmology by Weinberg Cosmology 0
Forthcoming cosmology book from Steven Weinberg? Science & Math Textbooks 5
A great 16 page paper in quantum cosmology Astronomy & Astrophysics 0