Gravitino dark matter without R-parity

Takayama, Fumihiro; Yamaguchi, Masahiro

doi:10.1016/s0370-2693(00)00726-7

Cited by 292 publications

(445 citation statements)

References 27 publications

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“…Another interesting possibility is gravitino DM [100][101][102][103][104][105][106][107]. The gravitino may be unstable on cosmological timescales and here we consider gravitino decays induced by R-parity violating (RPV) interactions [102][103][104].…”

Section: Gravitino Dark Mattermentioning

confidence: 99%

“…It is induced by a mixing between the photino and the neutrino, |Uγ ν |, which occurs if the RPV terms induce a VEV for the sneutrino [102,104] or via a loop with a charged lepton and slepton. This gives a gravitino lifetime [101,102], In the left panel of figure 7 we show the constraints on the photino-neutrino mixing angle as a function of the gravitino mass. In deriving the bound we require that the gravitino has the observed DM relic abundance.…”

Section: Jhep11(2013)193mentioning

confidence: 99%

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Constraining light dark matter with diffuse X-ray and gamma-ray observations

Essig

Kuflik

McDermott

et al. 2013

J. High Energ. Phys.

311

431

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We present constraints on decaying and annihilating dark matter (DM) in the 4 keV to 10 GeV mass range, using published results from the satellites HEAO-1, INTEGRAL, COMPTEL, EGRET, and the Fermi Gamma-ray Space Telescope. We derive analytic expressions for the gamma-ray spectra from various DM decay modes, and find lifetime constraints in the range 10 24 − 10 28 sec, depending on the DM mass and decay mode. We map these constraints onto the parameter space for a variety of models, including a hidden photino that is part of a kinetically mixed hidden sector, a gravitino with Rparity violating decays, a sterile neutrino, DM with a dipole moment, and a dark pion. The indirect constraints on sterile-neutrino and hidden-photino DM are found to be more powerful than other experimental or astrophysical probes in some parts of parameter space. While our focus is on decaying DM, we also present constraints on DM annihilation to electron-positron pairs. We find that if the annihilation is p-wave suppressed, the galactic diffuse constraints are, depending on the DM mass and velocity at recombination, more powerful than the constraints from the Cosmic Microwave Background.

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Section: Gravitino Dark Mattermentioning

confidence: 99%

Section: Jhep11(2013)193mentioning

confidence: 99%

Constraining light dark matter with diffuse X-ray and gamma-ray observations

Essig

Kuflik

McDermott

et al. 2013

J. High Energ. Phys.

311

431

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show abstract

“…In particular, we have modified our generated matrix elements in a way that allows us to set all trilinear Higgs couplings to their loop-corrected values. 10 Note that this goes well beyond a simple α → α eff prescription. Only then, we mostly find better agreement of our cross sections for stau annihilation into two Higgses with the ones computed by micrOMEGAs.…”

Section: Effects Of Large Stau-higgs Couplingsmentioning

confidence: 91%

“…3 where 9 In this context, note that we introduce a large mt-m e t 1,2 splitting when choosing MS = 1 TeV. 10 We are grateful to T. Plehn and M. Rauch for providing us, for cross-checking, with their implementation of a Fortran routine which calculates the Higgs self-couplings using the effective potential approach [72]. σ i v / σ tot v is shown.)…”

Section: Effects Of Large Stau-higgs Couplingsmentioning

confidence: 99%

Thermal relic abundances of long-lived staus

Pradler¹,

Steffen²

2009

Nuclear Physics B

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In supersymmetric models with a long-lived stau being the lightest Standard Model superpartner, the stau abundance during primordial nucleosynthesis is tightly constrained. Considering the complete set of stau annihilation channels in the minimal supersymmetric Standard Model (MSSM) with real parameters for scenarios in which sparticle coannihilations are negligible, we calculate the decoupling of the lighter stau from the primordial plasma and identify processes which are capable to deplete the resulting stau abundance significantly. We find particularly efficient stau annihilation at the resonance of the heavy CP-even Higgs boson and for a lighter stau with a sizeable left-right mixing due to enhanced stau-Higgs couplings. Even within the constrained MSSM, we encounter both effects leading to exceptionally small values of the resulting stau abundance. Prospects for collider phenomenology are discussed and possible implications of our findings are addressed with emphasis on gravitino dark matter scenarios.

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“…For the chosen supergravity models, consistency with electroweak precision tests, gravitino dark matter (GDM) and thermal leptogenesis leads to the following allowed mass ranges of gravitino and lightest neutralino [23], 10 GeV < m 3/2 < 500 GeV , 100 GeV < m χ 0 1 < 500 GeV , Consider now the rate for gravitino decay into photon and neutrino 5 [13] (cf. figure 2),…”

Section: Fermi-lat and The Lhcmentioning

confidence: 99%

Broken R-parity in the sky and at the LHC

Bobrovskyi

Buchmüller

Hajer

et al. 2010

J. High Energ. Phys.

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Supersymmetric extensions of the Standard Model with small R-parity and lepton number violating couplings are naturally consistent with primordial nucleosynthesis, thermal leptogenesis and gravitino dark matter. We consider supergravity models with universal boundary conditions at the grand unification scale, and scalar τ -lepton or binolike neutralino as next-to-lightest superparticle (NLSP). Recent Fermi-LAT data on the isotropic diffuse gamma-ray flux yield a lower bound on the gravitino lifetime. Comparing two-body gravitino and neutralino decays we find a lower bound on a neutralino NLSP decay length, cτ χ 0 1 > ∼ 30 cm. Together with gravitino and neutralino masses one obtains a microscopic determination of the Planck mass. For a τ -NLSP there exists no modelindependent lower bound on the decay length. Here the strongest bound comes from the requirement that the cosmological baryon asymmetry is not washed out, which yields cτ e τ 1 > ∼ 4 mm. However, without fine-tuning of parameters, one finds much larger decay lengths. For typical masses, m 3/2 ∼ 100 GeV and m NLSP ∼ 150 GeV, the discovery of a photon line with an intensity close to the Fermi-LAT limit would imply a decay length cτ NLSP of several hundred meters, which can be measured at the LHC.

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Gravitino dark matter without R-parity

Cited by 292 publications

References 27 publications

Constraining light dark matter with diffuse X-ray and gamma-ray observations

Constraining light dark matter with diffuse X-ray and gamma-ray observations

Thermal relic abundances of long-lived staus

Broken R-parity in the sky and at the LHC

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