Barbara Ryden Intro to Cosmology

Using Ryden equation 4.58 and the following equations, discuss the physical meaning of the following cases of the expanding universe's content, all for w

w ~= 0

w = 1/3

w = -1/3 or smaller

w = -1

nly we had a relation of the form P = P(e), (4.54) antins would be complete We P =we, (4.55) ensity gas of nonrelativistic massive particles. is that the random thermal motions of the gas which are tiny compared to the speed of light. e perfect gas law, P= PKT. (4.56) (4.57) P E. Moze mperature T and the root mean square thermal e relation 3kT = 1 (0-2). (4.58) nly we had a relation of the form P = P(e), (4.54) antins would be complete We P =we, (4.55) ensity gas of nonrelativistic massive particles. is that the random thermal motions of the gas which are tiny compared to the speed of light. e perfect gas law, P= PKT. (4.56) (4.57) P E. Moze mperature T and the root mean square thermal e relation 3kT = 1 (0-2). (4.58)