Cosmological limits on massive LSP ' $s$ - INSPIRE

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Cosmological limits on massive LSP ' $s$

Keith A. Olive
(
- Minnesota U.
)
,
Mark Srednicki
(
- UC, Santa Barbara
)

May, 1990

23 pages

Published in:

Nucl.Phys.B 355 (1991) 208-230

Published: 1991

DOI:

10.1016/0550-3213(91)90310-T

PDG: Other bounds on

{{\widetilde{\mathit \chi}}_{{{1}}}^{0}}

from astrophysics and cosmology

Report number:

UMN-TH-805-90,
UCSB-TH-90-33

reference search123 citations

Citations per year

Abstract: (Elsevier)

The minimal supersymmetric standard model (MSSM) predicts the existence of a massive stable particle (the lightest supersymmetric particle, or LSP) which could make up the dark matter in the universe. The LSP is commonly considered to be either a photino or a certain linear combination of higgsinos. However, when the supersymmetry-breaking gaugino and higgsino masses are taken to be large (but ≲ 10 TeV), the LSP is typically either a bino (superpartner of the hypercharge gauge boson) or a different linear combination of higgsinos. We calculate in detail the annihilation cross section for these massive ( m ≳ 20 GeV)LSP's, and use the results to determine their relic abundance. We show that if the LSP is a bino, both it and at least one squark or slepton must have mass less than ∼ 350 GeV in order to avoid overclosing the universe. If the LSP is a higgsino, its mass must be less than ∼ 1 TeV in order to avoid overclosing the universe. We also study in detail the prospect that the dark matter is composed of one of these particles.

dark matter
postulated particle: LSP
supersymmetry
mass: LSP
LSP: mass
annihilation: LSP
LSP: annihilation
cross section: annihilation
annihilation: cross section
sparticle: mass

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