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28 March 2024
 
  » arxiv » astro-ph/9810204

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Cold + Hot Dark Matter After Super-Kamiokande
Joel R. Primack ; Michael A. K. Gross ;
Date 13 Oct 1998
Subject astro-ph hep-ph
AffiliationSanta Cruz), Michael A. K. Gross (Goddard Space Flight Center
AbstractThe recent atmospheric neutrino data from Super-Kamiokande provide strong evidence of neutrino oscillations and therefore of non-zero neutrino mass. These data imply a lower limit on the hot dark matter (i.e., light neutrino) contribution to the cosmological density $Omega_ u >~ 0.001$ --- almost as much as that of all the stars in the universe --- and permit higher $Omega_ u$. The ``standard’’ COBE-normalized critical-matter-density (i.e., $Omega_m=1$) Cold Dark Matter (CDM) model has too much power on small scales. But adding to CDM neutrinos with mass of about 5 eV, corresponding to $Omega_ u approx 0.2$, results in a much improved fit to data on the nearby galaxy and cluster distribution. Indeed, the resulting Cold + Hot Dark Matter (CHDM) cosmological model is arguably the most successful $Omega_m=1$ model for structure formation. However, other recent data has begun to make the case for $Omega_m <~ 0.6$ fairly convincing. In light of all this new data, we reconsider whether cosmology still provides evidence favoring neutrino mass of a few eV in flat models with cosmological constant $Omega_Lambda = 1 - Omega_m$. We find that the possible improvement of the low-$Omega_m$ flat (LCDM) cosmological models with the addition of light neutrinos appears to be rather limited.
Source arXiv, astro-ph/9810204
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