Why Not Consider Closed Universes?

Details Why Not Consider Closed Universes? Why Not Consider Closed Universes?

1995-08-31

arxiv.org/abs/astro-ph/9508157v1

Astrophys.J.459:415,1996

Astronomy and Astrophysics

Astrophysics

24 pages, including 13 figures in a uuencoded self-unpacking shell script. Submitted to ApJ

Scientific paper

10.1086/176904

We consider structure formation and CMB anisotropies in a closed universe, both with and without a cosmological constant. The CMB angular power spectrum and the matter transfer function are presented, along with a discussion of their relative normalization. This represents the first full numerical evolution of density perturbations and anisotropies in a spherical geometry. We extend the likelihood function vs. Omega from the COBE 2-year data to Omega>=1. For large Omega the presence of a very steep rise in the spectrum towards low ell allows us to put an upper limit of Omega<=1.5 (95%CL) for primordial spectra with n<=1. This compares favorably with existing limits on Omega. We show that there are a range of closed models which are consistent with observational constraints while being even older than the currently popular flat models with a cosmological constant. Future constraints from degree scale CMB data may soon probe this region of parameter space. A derivation of the perturbed Einstein, fluid and Boltzmann equations for open and closed geometries is presented in an appendix.

Affiliated with

Also associated with

No associations

Rating

Why Not Consider Closed Universes? 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 Why Not Consider Closed Universes?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Why Not Consider Closed Universes? will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-573949