Dark matter nature from CMB and LSS data

Details Dark matter nature from CMB and LSS data Dark matter nature from CMB and LSS data

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newar..43..169b&link_type=abstract

New Astronomy Reviews, Volume 43, Issue 2-4, p. 169-183.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

CBR anisotropies and LSS data can be used to constrain cosmological models. In these lectures we discuss dark matter nature on the light of available CMB data. Mixed models with different hot components, including neutrinos or volatile HDM, are considered. The latter kind of HDM arises from heavier particles, decaying well before matter-radiation equivalence (lifetime ~104-107 s). The CBR power spectra of mixed models exhibit a higher Doppler peak than CDM if HDM has a late derelativization. This is why volatile HDM can be relevant as it allows quite a late derelativization, even for large Ωh. We show that, even if /1 is allowed, Large Scale Structure (LSS) alone prescribes that Ωh<~0.30. However, while LSS can be fitted by taking simultaneously a low derelativization redshift zder (down to /~=600) and a high n, CAT and Saskatoon data cause a severe selection on this part of the parameter space. In fact, late derelativization and /1 have opposite effects on the fluctuation spectrum /P(k), but sum their action on the angular spectrum Cl. Hence /n>~1.3 is excluded by balloon-borne experiments, while a good fit of almost all CBR and LSS data is found for Ωh values between 0.11 and 0.16, /n~1.1 and zder~2000-5000. A smaller n is allowed, but zder<1200 is hardly allowed.

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