Gravitino dark matter in R-parity breaking vacua

By W. Buchmuller, L. Covi, K. Hamaguchi, A. Ibarra, T. Yanagida. 2007

282 citations recorded by the source corpus.

We show that in the case of small R-parity and lepton number breaking couplings, primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter are naturally consistent for gravitino masses m3/25 GeV. We present a model where R-parity breaking is tied to B-L breaking, which predicts the needed small couplings. The metastable next-to-lightest superparticle has a decay length that is typically larger than a few centimeters, with characteristic signatures at the LHC. The photon flux produced by relic gravitino decays may be part of the apparent excess in the extragalactic diffuse gamma-ray flux obtained from the EGRET data for a gravitino mass m3/2 ~ 10 GeV. In this case, a clear signal can be expected from GLAST in the near future.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/184d4849ff3712d302161baa4135daf5df40db55

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Citations in the corpus

Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects (2012, background): “For most of this review, we will assume that DM consists of WIMPs; many aspects, however, can be applied – or generalized in a straight-forward way – to other cases as well, most notably decaying DM [35, 36] (for which one simply has to replace 1 2〈σv〉ρχ → mχΓρχ in Eq.”
Observation of an anomalous positron abundance in the cosmic radiation (2008, unknown): “g.[4]) is also an interesting candidate.”
Lyman-alpha constraints on warm and on warm-plus-cold dark matter models (2008, background): “There are many examples of super-WIMP DM models: sterile neutrinos [15], gravitinos in theories with broken R-parity [37, 38], light volume moduli [39] or Majorons [40].”
Cores in warm dark matter haloes: a Catch 22 problem (2012, background): “…representatives of such warm dark matter (WDM) candidates are the sterile neutrino and the gravitino (Abazajian & Koushiappas 2006; Boyarsky et al. 2009a), whose presence is also motivated by particle theory (e.g. Dodelson & Widrow 1994; Buchmüller et al. 2007; Takayama & Yamaguchi 2000).”
Constraining light dark matter with diffuse X-ray and gamma-ray observations (2013, background): “A second, two-body, decay mode is G̃ → γν, which usually dominates the decay width [104] and gives stronger bounds.”
Optimized dark matter searches in deep observations of Segue 1 with MAGIC (2013, background): “appropriate relic density through the thermal production is achieved, naturally leading to a cosmological history consistent with thermal leptogenesis and primordial nucleosynthesis [55].”