Cosmic microwave background anisotropies in cold dark matter models with cosmological constant: The intermediate versus large angular scales

Details Cosmic microwave background anisotropies in cold dark matter models with cosmological constant: The intermediate versus large angular scales Cosmic microwave background anisotropies in cold dark matter models with cosmological constant: The intermediate versus large angular scales

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422l..41s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 422, no. 2, p. L41-L44

Mathematics

Logic

9

Anisotropy, Astronomical Models, Background Radiation, Cosmic Rays, Cosmology, Dark Matter, Microwaves, Abundance, Baryons, Boltzmann Distribution, Monte Carlo Method, Statistical Analysis

Scientific paper

We obtain predictions for cosmic microwave background anisotropies at angular scales near 1 deg in the context of cold dark matter models with a nonzero cosmological constant, normalized to the Cosmic Background Explorer (COBE) Differential Microwave Radiometer (DMR) detection. The results are compared to those computed in the matter-dominated models. We show that the coherence length of the Cosmic Microwave Background (CMB) anisotropy is almost insensitive to cosmological parameters, and the rms amplitude of the anisotropy increases moderately with decreasing total matter density, while being most sensitive to the baryon abundance. We apply these results in the statistical analysis of the published data from the UCSB South Pole (SP) experiment (Gaier et al. 1992; Schuster et al. 1993). We reject most of the Cold Dark Matter (CDM)-Lambda models at the 95% confidence level when both SP scans are simulated together (although the combined data set renders less stringent limits than the Gaier et al. data alone). However, the Schuster et al. data considered alone as well as the results of some other recent experiments (MAX, MSAM, Saskatoon), suggest that typical temperature fluctuations on degree scales may be larger than is indicated by the Gaier et al. scan. If so, CDM-Lambda models may indeed provide, from a point of view of CMB anisotropies, an acceptable alternative to flat CDM models.

Affiliated with

Also associated with

No associations

Rating

Cosmic microwave background anisotropies in cold dark matter models with cosmological constant: The intermediate versus large angular scales 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 Cosmic microwave background anisotropies in cold dark matter models with cosmological constant: The intermediate versus large angular scales, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmic microwave background anisotropies in cold dark matter models with cosmological constant: The intermediate versus large angular scales will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1014629