Implications of new CMB data for neutralino dark matter

Abstract

The combination of new cosmic microwave background data with cosmological priors has determined the physical cold dark matter (cdm) density to be Ωcdmh 2 = 0.13 ± 0.01. We find the corresponding regions of parameters in the minimal supergravity model for which the lightest neutralino is the cdm particle. We then compare with the muon anomalous magnetic moment (aµ) measurement, the mass of the lighter CP-even Higgs boson (h 0), the trilepton search at the upgraded Fermilab Tevatron collider, and a direct search for relic neutralinos. The intersection of Ωcdmh 2 and aµ constraints selects tan β ≈ 40 − 45.Recent precision measurements of the Cosmic Microwave Background (CMB) anisotropy [1–3] place restrictive constraints on the densities of matter and dark energy in the Universe. The results of parameter extraction from the CMB data made in conjunction with other cosmological priors (flat universe, supernovae, large-scale structure) give a baryon density1,2 Ωbh2 = 0.022 ± 0.003, which is very consistent with the predictions of Big Bang Nucleosynthesis theory. A cold dark matter density Ωcdmh2 = 0.13 ± 0.01 is extracted