Superstring dark matter

B. A. Campbell, John Ellis, K. Enqvist, D. V. Nanopoulos, J. S. Hagelin, K. A. Olive

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

It is argued that the lightest supersymmetric particle (LSP) emerging from the superstring theory is a mixture of neutral gauginos and matter fermions. Their mixing matrix is presented, calculated in a plausible minimal low-energy model abstracted from the superstring and the composition of the LSP χ is exhibited. Its relic cosmological density is computed and it is found that it lies within a factor 2 of the critical density required for closure, over a wide range of possible input parameters. Also the flux of neutrinos from LSP annihilation in the sun is computed, and it is found that it straddles the upper bound from proton decay detectors. Acceptable fluxes are obtained if mχ < mt, in which case the superstring relic can have the critical density for a present Hubble expansion rate H0 {greater-than or approximate} 50 km/s/Mpc only if mt {greater-than or approximate} 40 GeV.

Original languageEnglish (US)
Pages (from-to)270-278
Number of pages9
JournalPhysics Letters B
Volume173
Issue number3
DOIs
StatePublished - Jun 12 1986

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