Neutralino relic density in a universe with a nonvanishing cosmological constant

Journal Article · Sat Jul 15 04:00:00 EDT 2000 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.62.023515· OSTI ID:20217150

Lahanas, A B ^[1]; Nanopoulos, D V ^[2]; Spanos, V C ^[1]

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1. Physics Department, Nuclear and Particle Physics Section, University of Athens, GR-15771 Athens, (Greece)
2. Department of Physics, Texas A and M University, College Station, Texas 77843-4242 (United States)

We discuss the relic density of the lightest of the supersymmetric particles in view of new cosmological data, which favor the concept of an accelerating universe with a nonvanishing cosmological constant. Recent astrophysical observations provide us with very precise values of the relevant cosmological parameters. Certain of these parameters have direct implications on particle physics, e.g., the value of matter density, which in conjunction with electroweak precision data put severe constraints on the supersymmetry breaking scale. In the context of the constrained minimal supersymmetric standard model (CMSSM) such limits read as M{sub 1/2}{approx_equal}300 GeV-340 GeV, m{sub 0}{approx_equal}80 GeV-130 GeV. Within the context of the CMSSM a way to avoid these constraints is either to go to the large tan {beta} and {mu}>0 region, or make {tau}(tilde sign){sub R}, the next to lightest supersymmetric particle (LSP), be almost degenerate in mass with the LSP. (c) 2000 The American Physical Society.

• OSTI ID: 20217150
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 62; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BACKGROUND RADIATION
COSMIC NEUTRINOS
COSMIC RADIATION
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
SPARTICLES
THEORETICAL DATA