Gauge Couplings at High Temperature and the Relic Gravitino Abundance

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dc.creatorBuchmüller, W.
dc.creatorHamaguchi, K.
dc.creatorRatz, M.
dc.date2003-07-14
dc.date2003-09-04
dc.date.accessioned2026-07-07T11:31:26Z
dc.date.available2026-07-07T11:31:26Z
dc.descriptionIn higher-dimensional supersymmetric theories gauge couplings of the effective four-dimensional theory are determined by expectation values of scalar fields. We find that at temperatures above a critical temperature $T_*$, which depends on the supersymmetry breaking mass scales, gauge couplings decrease like $T^{-\a}$, $\a > 1$. This has important cosmological consequences. In particular it leads to a relic gravitino density which becomes independent of the reheating temperature for $T_R > T_*$. For small gravitino masses, $m_{3/2} \ll m_{\gl}$, the mass density of stable gravitinos is essentially determined by the gluino mass. The observed value of cold dark matter, $Ø_{\rm CDM}h^2 \sim 0.1$, is obtained for gluino masses $m_{\gl} = {\cal O}(1 {\rm TeV})$.
dc.description11 pages, 2 figures, comment on supersymmetry breaking mechanisms and two references added
dc.identifierhttps://arxiv.org/abs/hep-ph/0307181
dc.identifierhttp://arxiv.org/abs/hep-ph/0307181
dc.identifierPhys.Lett.B574:156-161,2003
dc.identifierdoi:10.1016/j.physletb.2003.09.017
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/197269
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleGauge Couplings at High Temperature and the Relic Gravitino Abundance
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