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Moreau, Pierre‐François; Lardic, Jean-Marie

doi:10.3917/aphi.651.0005

Cited by 1 publication

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“…Finally we note that the results obtained in the present study remain valid when R−parity is violated. In effect, in this case the gravitino lifetime is τ 3/2 ∼ 10 20 sec (m 3/2 /1 GeV) −3 for trilinear R−parity violating terms [15] or τ 3/2 ∼ 10 27 sec (m 3/2 /1 GeV) −3 for bilinear R−parity violating terms [14]. Hence the gravitino is sufficiently long-lived that it can be considered as stable dark matter with respect to the formation of largescale structure.…”

Section: Discussionmentioning

confidence: 97%

“…However, we will show that, when m 3/2 < ∼ 10 MeV, our results remain valid even if R−parity is violated. In this range the gravitino lifetime becomes much longer than the age of the Universe, so that it can be considered as stable on our cosmological time and constraints from diffuse background distortions are eluded [14,15]. Finally we note that Ref.…”

Section: Introductionmentioning

confidence: 87%

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Gravitino dark matter in gauge mediated supersymmetry breaking

2006

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This paper investigates the parameter space of theories with gauge mediated supersymmetry breaking leading to gravitino (cold) dark matter with mass m_{3/2}= 1keV - 10MeV. We pay particular attention to the cosmological role of messenger fields. Cosmology requires that these messengers decay to the visible sector if the lightest messenger mass M_X > 30TeV. We then examine the various possible messenger number violating interactions allowed by the symmetries of the theory and by phenomenology. Late messenger decay generally results in entropy production hence in the dilution of pre-existing gravitinos. We find that in SU(5) grand unification only specific messenger-matter couplings allow to produce the required amount of gravitino dark matter particles. Gravitino dark matter with the correct abundance is however expected in larger gauge groups such as SO(10) for generic non-renormalizable messenger-matter interactions and for arbritrarily high post-inflationary reheating temperatures.Comment: 21 pages, 5 figures ; matches published versio

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 87%