Cosmological Parameters

Details Cosmological Parameters Cosmological Parameters

1999-04-03

arxiv.org/abs/astro-ph/9904051v1

Astronomy and Astrophysics

Astrophysics

27 pages LaTeX with 8 eps figures. To be published in The Proceedings of Particle Physics and the Universe (Cosmo-98), edited

Scientific paper

10.1063/1.59381

The discussion of cosmological parameters used to be a source of embarrassment to cosmologists. Today, measurements of the cosmological parameters are leading the way into the era of precision cosmology. The CMB temperature is measured to four significant figures, T_0=2.7277+/-0.002 K; the Hubble constant is now determined with a reliable error estimate, H_0=(65+/-5) km sec^-1 Mpc^-1; the mass density of baryons is precisely determined by big-bang nucleosynthesis Omega_B = (0.019+/-0.001) h^-2; and the age of the Universe inferred from the ages of the oldest stars is 14+/-1.5 Gyr, which is consistent the expansion age. Further, we have the first full accounting of matter and energy in the Universe, complete with a self consistency check. Expressed as a fraction of the critical density it goes like this: neutrinos, between 0.3% and 15%; stars, between 0.3% and 0.6%; baryons (total), 5+/-0.5%; matter (total),40% +/- 10%; smooth, dark energy, 80% +/- 20%; totaling to the critical density (within the errors).

Affiliated with

Also associated with

No associations

Rating

Cosmological Parameters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cosmological Parameters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological Parameters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-387369