Cosmological gravitino regeneration and decay

Ellis, Jonathan Richard; Kim, J E; Nanopoulos, Dimitri V.

doi:10.1016/0370-2693(84)90334-4

Cited by 779 publications

(778 citation statements)

References 13 publications

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“…[47]. 9 Working with an upper limit on the primordial 6 Li/H abundance of [93] which provides a more relaxed Y e l − 1 limit. In Figs.…”

Section: Probing Tr With Primordial Nucleosynthesismentioning

confidence: 99%

“…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%

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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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“…[47]. 9 Working with an upper limit on the primordial 6 Li/H abundance of [93] which provides a more relaxed Y e l − 1 limit. In Figs.…”

Section: Probing Tr With Primordial Nucleosynthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Steffen¹

2008

Physics Letters B

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“…The parameter λ is taken to range between 10 −4 and 10 −3 . Fixing the reheat temperature T reh to the value 10 9 GeV [34] and taking g * = 228.75 which corresponds to the MSSM spectrum, Eq. (4.7) yields the inflaton decay time t reh = Γ −1 infl ≃ 2.44 × 10 −1 GeV −1 .…”

Section: The Band Structurementioning

confidence: 99%

The Peccei-Quinn field as curvaton

Dimopoulos

Lazarides

Lyth

et al. 2003

J. High Energy Phys.

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A simple extension of the minimal supersymmetric standard model which naturally and simultaneously solves the strong CP and µ problems via a PecceiQuinn and a continuous R symmetry is considered. This model is supplemented with hybrid inflation and leptogenesis, but without taking the specific details of these scenarios. It is shown that the Peccei-Quinn field can successfully act as a curvaton generating the total curvature perturbation in the universe in accord with the cosmic background explorer measurements. A crucial phenomenon, which assists us to achieve this, is the 'tachyonic amplification' of the perturbation acquired by this field during inflation if the field, in its subsequent evolution, happens to be stabilized for a while near a maximum of the potential. In this case, the contribution of the field to the total energy density is also enhanced ('tachyonic effect'), which helps too. The cold dark matter in the universe consists, in this model, mainly of axions which carry an isocurvature perturbation uncorrelated with the total curvature perturbation. There are also lightest sparticles (neutralinos) which, like the baryons, originate from the inflationary reheating and, thus, acquire an isocurvature perturbation fully correlated with the curvature perturbation. So, the overall isocurvature perturbation has a mixed correlation with the adiabatic one. It is shown that the presently available bound on such an isocurvature perturbation from cosmic microwave background radiation and other data is satisfied. Also, the constraint on the non-Gaussianity of the curvature perturbation obtained from the recent Wilkinson microwave anisotropy probe data is fulfilled thanks to the 'tachyonic effect'.

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“…Inflation was used to dilute the primordial gravitinos, but thermal production of gravitinos are troublesome in cosmology if it exceeds [3] T R > 10 9 GeV.…”

Section: Axion and Gravitino Constraintsmentioning

confidence: 99%

“…But even after the reheating phase, the thermal production can be effective enough to create sufficient number of heavy particles to close the universe. It has been most extensively studied for the case of O(100 GeV) gravitino [3]. Because of the gravitino problem, we consider the reheating temperature below 10 9 GeV.…”

Section: Introductionmentioning

confidence: 99%

Axino as Cold Dark Matter Candidate

Kim

2002

Dark Matter in Astro- And Particle Physics

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Abstract. The possibility of the CDM axino is presented. From the early days of supersymmetry, axino has been considered as hot dark matter and warm dark matter. But the CDM axino has been considered quite recently. It is because the low reheating temperature of the universe is gaining momentum recently from various considerations in particle cosmology. I present a general introduction on the CDM's, in particular the axino, the calculation on the axino density in the universe, and the constraints imposed on the axino parameters.

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Cosmological gravitino regeneration and decay

Cited by 779 publications

References 13 publications

Probing the reheating temperature at colliders and with primordial nucleosynthesis

Probing the reheating temperature at colliders and with primordial nucleosynthesis

The Peccei-Quinn field as curvaton

Axino as Cold Dark Matter Candidate

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