Cosmological constraints on the light stable gravitino

Moroi, Takeo; Murayama, Hitoshi; Yamaguchi, Masahiro

doi:10.1016/0370-2693(93)91434-o

Cited by 578 publications

(866 citation statements)

References 25 publications

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“…However, they can be reproduced in the following ways: (i) in the thermal bath, through scatterings [22,23,24,25,26,27] and decays [26,28,29] involving superpartners, and (ii) non-thermally [30,31], from the out-of-equilibrium decay of the next-to-LSP (NLSP). In this paper we do not consider the possible non-thermal production of e-WIMPs, since this mechanism is highly model dependent (i.e., it is sensitive to the type and decay products of the NLSP).…”

Section: Introductionmentioning

confidence: 99%

Quintessential kination and thermal production of gravitinos and axinos

Gómez

Lola

Pallis

et al. 2009

J. Cosmol. Astropart. Phys.

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The impact of a kination-dominated phase generated by a quintessential exponential model on the thermal abundance of gravitinos and axinos is investigated. We find that their abundances become proportional to the transition temperature from the kination to the radiation era; since this temperature is significantly lower than the initial ("reheating") temperature, the abundances decrease with respect to their values in the standard cosmology. For values of the quintessential energy-density parameter close to its upper bound, on the eve of nucleosynthesis, we find the following: (i) for unstable gravitinos, the gravitino constraint is totally evaded; (ii) If the gravitino is stable, its thermal abundance is not sufficient to account for the cold dark matter of the universe; (iii) the thermal abundance of axinos can satisfy the cold dark matter constraint for values of the initial temperature well above those required in the standard cosmology. A novel calculation of the axino production rate by scatterings at low temperature is also presented.

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Section: Introductionmentioning

confidence: 99%

Quintessential kination and thermal production of gravitinos and axinos

Gómez

Lola

Pallis

et al. 2009

J. Cosmol. Astropart. Phys.

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show abstract

“…Accordingly, once produced in thermal scattering of particles in the hot primordial plasma [9,10,11,12,13,14,15,17], unstable gravitinos with a mass m e G < ∼ 5 TeV have long lifetimes, τ e G > ∼ 100 s, and decay during or after BBN. Since the decay products affect the abundances of the primordial light elements, successful BBN predictions imply a bound on the reheating temperature after inflation T R which governs the abundance of gravitinos before their decay [9,10,11,12,13,14,15,16,17]: T R < ∼ 10 8 GeV for m e G < ∼ 5 TeV [5,7]. We consider SUSY extensions of the Standard Model in which the gravitino G is the lightest supersymmetric particle (LSP) and a charged slepton l 1 -such as the lighter stau τ 1 -the next-to-lightest supersymmetric particle (NLSP).…”

Section: Introductionmentioning

confidence: 99%

“…Assuming R-parity conservation, the gravitino LSP is stable and a promising candidate for dark matter; cf. [10,12,13,14,15,16,17,18,19,20,21,22,23] and references therein. Because of the extremely weak interactions of the gravitino, the NLSP typically has a long lifetime before it decays into the gravitino.…”

Section: Introductionmentioning

confidence: 99%

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Steffen¹

2008

Physics Letters B

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Considering gravitino dark matter scenarios with a long-lived charged slepton, we show that collider measurements of the slepton mass and its lifetime can probe not only the gravitino mass but also the post-inflationary reheating temperature TR. In a model independent way, we derive upper limits on TR and discuss them in light of the constraints from the primordial catalysis of 6 Li through bound-state effects. In the collider-friendly region of slepton masses below 1 TeV, the obtained conservative estimate of the maximum reheating temperature is about TR = 3×10 9 GeV for the limiting case of a small gluino-slepton mass splitting and about TR = 10 8 GeV for the case that is typical for universal soft supersymmetry breaking parameters at the scale of grand unification. We find that a determination of the gluino-slepton mass ratio at the Large Hadron Collider will test the possibility of TR > 10 9 GeV and thereby the viability of thermal leptogenesis with hierarchical heavy right-handed Majorana neutrinos.PACS numbers: 98.80. Cq, 95.35.+d, 12.60.Jv, 95.30.Cq

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“…Cosmological constraints such as the gravitino overproduction problem [48][49][50][51][52] impose an upper bound on the reheating temperature. This problem comes from the fact that if gravitinos are stable then their energy density should not be larger than the energy density of the universe, which results in an upper bound on the reheating temperature.…”

Section: Jhep06(2017)109 4 Reheatingmentioning

confidence: 99%

Sneutrino driven GUT inflation in supergravity

Gonzalo¹,

Heurtier²,

Moursy³

2017

J. High Energ. Phys.

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In this paper, we embed the model of flipped GUT sneutrino inflation -in a flipped SU(5) or SO(10) set up -developed by Ellis et al. in a supergravity framework. The GUT symmetry is broken by a waterfall which could happen at early or late stage of the inflationary period. The full field dynamics is thus studied in detail and these two main inflationary configurations are exposed, whose cosmological predictions are both in agreement with recent astrophysical measurements. The model has an interesting feature where the inflaton has natural decay channels to the MSSM particles allowed by the GUT gauge symmetry. Hence it can account for the reheating after the inflationary epoch.

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Cosmological constraints on the light stable gravitino

Cited by 578 publications

References 25 publications

Quintessential kination and thermal production of gravitinos and axinos

Quintessential kination and thermal production of gravitinos and axinos

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Sneutrino driven GUT inflation in supergravity

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