CMB and LSS Constraints on mixed models with N > 1

Details CMB and LSS Constraints on mixed models with N > 1 CMB and LSS Constraints on mixed models with N > 1

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aspc..176..309b&link_type=abstract

Observational Cosmology: The Development of Galaxy Systems, Proceedings of the International Workshop held at Sesto Pusteria, Bo

Astronomy and Astrophysics

Astronomy

Scientific paper

We compute CBR anisotropies in mixed models with different hot components, including neutrinos or volatile HDM, arising from heavier particles, decaying well before matter-radiation equivalence (lifetime ~10^4-10^7s). The CBR power spectra of these models exhibit a higher doppler peak than CDM, and the discrepancy is even stronger in volatile models which allow quite a late derelativization of HDM, even for large Ω_h. CBR experiments, together with Large Scale Structure (LSS) data, are then used to constrain the space parameter of mixed models, when values of the primeval spectral index n > 1 are also considered. Even if n > 1 is allowed, however, LSS alone prescribes that Ω_h mincir 0.30. LSS can be fitted by taking simultaneously a low derelativization redshift zder (down to ≍ 600, as is allowed in volatile models) and a high n. But CBR data from baloon-borne experiment cause a severe selection on this part of the parameter space. In fact, late derelativization and n > 1 have opposite effects on the fluctuation spectrum P(k), but sum their action on the angular spectrum C_l. Hence n magcir 1.3 seems excluded by baloon-borne experiment outputs, while a good fit of almost all CBR and LSS data is found for Ω_h 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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