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28 March 2024
 
  » arxiv » astro-ph/9607061

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Dark Matter and Cosmology: CDM with a Cosmological Constant ($Lambda$CDM) vs. CDM with Hot Dark Matter (CHDM)
Joel Primack ; Anatoly Klypin ;
Date 12 Jul 1996
Journal Nucl.Phys.Proc.Suppl. 51B (1996) 30-38
Subject astro-ph
AffiliationUniversity of California Santa Cruz) and Anatoly Klypin (New Mexico State University
AbstractHere we discuss what are perhaps the two most popular variants of CDM that might agree with the data: lcdm and CHDM. While the predictions of COBE-normalized lcdm and CHDM both agree well with the available data on scales of $sim 10$ to $100 hMpc$, each has potential virtues and defects. lcdm with $Omega_0 sim 0.3$ has the possible virtue of allowing a higher expansion rate $H_0$ for a given cosmic age $t_0$, but the defect of predicting too much fluctuation power on small scales. CHDM has less power on small scales, so its predictions appear to be in good agreement with data on the galaxy distribution, but it remains to be seen whether it predicts early enough galaxy formation to be compatible with the latest high-redshift data. Also, two very recent observational results favor high cosmic density, and thus favor $Omega=1$ models such as CHDM over lcdm --- (1) the positive deceleration parameter $q_0>0$ measured using high-redshift Type Ia supernovae, and (2) the low primordial deuterium/hydrogen ratio measured in two different quasar absorption spectra. We try to identify ``best’’ variants of both lcdm and CHDM, and discuss critical observational tests for both models.
Source arXiv, astro-ph/9607061
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