Relic density of neutralino dark matter in supergravity models
- Department of Physics, University of Wisconsin, Madison, Wisconsin53706 (United States)
We calculate the relic density ({Omega}{sub {chi}{sub 1}{sup 0}}h{sup 2}) of neutralino dark matter in supergravity models with radiative electroweak symmetry breaking, for values of the Higgs sector parameter tan{beta}{equivalent_to}v{sub 2}/v{sub 1} between the two infrared fixed points of the top quark Yukawa coupling, tan{beta}{approx_equal}1.8 and tan{beta}{approx_equal}56. For tan{beta}{approx_lt}10, the CP-odd Higgs pseudoscalar (A{sup 0}) and the heavier CP-even Higgs scalar (H{sup 0}) are much heavier than the lightest neutralino ({chi}{sub 1}{sup 0}), and the annihilation cross section of {chi}{sub 1}{sup 0} pairs is significantly enhanced only in the vicinity of the lighter CP-even Higgs boson (h{sup 0}) and the Z boson poles. For tan{beta}{approx_gt}40, m{sub A} and m{sub H} become comparable to 2m{sub {chi}{sub 1}{sup 0}}, and the neutralino annihilation cross section can be significantly enhanced by the poles of the H{sup 0} and the A{sup 0} as well. For a cosmologically interesting relic density, 0.1{approx_lt}{Omega}{sub {chi}{sub 1}{sup 0}}h{sup 2}{approx_lt}0.5, we find that the supergravity parameter space is tightly constrained. The mass spectra for supersymmetric particles are presented for unification mass parameters in the cosmologically interesting region. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 615340
- Journal Information:
- Physical Review, D, Vol. 57, Issue 5; Other Information: PBD: Mar 1998
- Country of Publication:
- United States
- Language:
- English
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