Gravitino Dark Matter without R-parity

By F. Takayama, M. Yamaguchi. 2000

264 citations recorded by the source corpus.

Abstract Cosmological issues are examined when the gravitino is the lightest superparticle (LSP) and R-parity is broken. Decays of the next lightest superparticles occur rapidly via R-parity violating interaction, and thus they do not upset the big-bang nucleosynthesis, unlike the R-parity conserving case. The gravitino LSP becomes unstable, but its lifetime is typically much longer than the age of the Universe. It turns out that observations of the diffuse photon background coming from radiative decays of the gravitino do not severely constrain the gravitino abundance, and thus a gravitino weighing less than around 1 GeV can be the dark matter of the Universe when bilinear R-parity violation generates a neutrino mass which accounts for the atmospheric neutrino anomaly.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/7d93edaa3ea47b5b7d04e26a9a1ef5e39776a8ef

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Citations in the corpus

MFV SUSY: A Natural Theory for R-Parity Violation (2011, background): “A gravitino dark matter scenario within R-parity violating SUSY has been advocated in [52].”
Constraining light dark matter with diffuse X-ray and gamma-ray observations (2013, background): “It is induced by a mixing between the photino and the neutrino, |Uγ̃ν |, which occurs if the RPV terms induce a VEV for the sneutrino [102, 104] or via a loop with a charged lepton and slepton.”
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).”
Gravitino dark matter in R-parity breaking vacua (2007, methodology): “4 × 1018 GeV, one obtains for the gravitino lifetime [6]”
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].”
Direct Detection of Warm Dark Matter in the X-Ray (2001, background): “In one specific example considered by Takayama & Yamaguchi (2000), the R-parity violation is bilinear with the lightest neutralino being bino-dominant.”