A note on the moduli-induced gravitino problem

Shuhmaher, Natalia

doi:10.1088/1126-6708/2008/12/094

Cited by 5 publications

(4 citation statements)

References 34 publications

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“…Building on the original work, further studies of the moduli-induced gravitino problem have been performed in [729,730,731,732,733,734,735,736,737,738,739,740,741,742,743,744].…”

Section: Moduli-induced Gravitino Problemsmentioning

confidence: 99%

String Cosmology: from the Early Universe to Today

Cicoli¹,

Conlon²,

Maharana³

et al. 2023

Preprint

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We review applications of string theory to cosmology, from primordial times to the present-day accelerated expansion. Starting with a brief overview of cosmology and string compactifications, we discuss in detail moduli stabilisation, inflation in string theory, the impact of string theory on post-inflationary dynamics (reheating, moduli domination, kination), dark energy (the cosmological constant from a string landscape and models of quintessence) and various alternative scenarios (string/brane gases, the pre big-bang scenario, rolling tachyons, ekpyrotic/cyclic cosmologies, bubbles of nothing, S-brane and holographic cosmologies). The state of the art in string constructions is described in each topic and, where relevant, connections to swampland conjectures are made. The possibilities for novel particles and excitations (axions, moduli, cosmic strings, branes, solitons, oscillons and boson stars) are emphasised. Implications for the physics of the CMB, gravitational waves, dark matter and dark radiation are discussed along with potential observational signatures.

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“…Building on the original work, further studies of the moduli-induced gravitino problem have been performed in [729,730,731,732,733,734,735,736,737,738,739,740,741,742,743,744].…”

Section: Moduli-induced Gravitino Problemsmentioning

confidence: 99%

String Cosmology: from the Early Universe to Today

Cicoli¹,

Conlon²,

Maharana³

et al. 2023

Preprint

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“…For example, moduli couplings to the Higgs (∼ σH † H) are relevant operators and the moduli might undergo enhanced decay to Higgs bosons. However, such couplings were already considered some time ago by Brandenberger and Shuhmaher in [35,36]. They considered relevant operators arising from SUSY breaking for a range of moduli masses.…”

Section: Comments and Conclusionmentioning

confidence: 99%

Was the Universe actually radiation dominated prior to nucleosynthesis?

et al. 2017

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Maybe not. String theory approaches to both beyond the Standard Model and Inflationary model building generically predict the existence of scalars (moduli) that are light compared to the scale of quantum gravity. These moduli become displaced from their low energy minima in the early universe and lead to a prolonged matter-dominated epoch prior to BBN. In this paper, we examine whether non-perturbative effects such as parametric resonance or tachyonic instabilities can shorten, or even eliminate, the moduli condensate and matter-dominated epoch. Such effects depend crucially on the strength of the couplings, and we find that unless the moduli become strongly coupled the matterdominated epoch is unavoidable. In particular, we find that in string and M-theory compactifications where the lightest moduli are near the TeV-scale that a matter-dominated epoch will persist until the time of Big Bang Nucleosynthesis.1 We work with sign convention (−, +, +, +) and with the reduced Planck mass mp = 1/(8πG) 1/2 = 2.4 × 10 18 GeV. We use Greek indices to denote space-time µ = 0, 1, 2, 3 whereas latin indices imply spatial directions only k = 1, 2, 3.

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“…In the meantime, it is desirable to have a thorough understanding of the conditions under which the energy transfer from the inflationary sector to preheat matter fields is efficient. Further, the preliminary theory of preheating has been successfully applied in other areas, for instance in the notion of moduli trapping on the landscape [15,16,17], a possible solution [18] to the moduli-induced gravitino problem [95], or as an additional source of gravitational waves [19,20,21,22,23,24,25,26]. In light of these applications, it is necessary to investigate the viability of the proposed mechanisms, particularly as, in recent years, new developments in string cosmology (see [27,28,29,30] for recent reviews) have led to the emergence of several multi-field inflationary models; a few examples are inflation on the landscape [31,32], inflation driven by axions i.e.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suppression of parametric resonance and the viability of tachyonic preheating after multifield inflation

Battefeld¹,

Battefeld²,

Giblin³

2009

Phys. Rev. D

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We investigate the feasibility of explosive particle production via parametric resonance or tachyonic preheating in multi-field inflationary models by means of lattice simulations. We observe a strong suppression of resonances in the presence of four-leg interactions between the inflaton fields and a scalar matter field, leading to insufficient preheating when more than two inflatons couple to the same matter field. This suppression is caused by a dephasing of the inflatons that increases the effective mass of the matter field.Including three-leg interactions leads to tachyonic preheating, which is not suppressed by an increase in the number of fields. If four-leg interactions are sub-dominant, we observe a slight enhancement of tachyonic preheating. Thus, in order for preheating after multi-field inflation to be efficient, one needs to ensure that three-leg interactions are present. If no tachyonic contributions exist, we expect the old theory of reheating to be applicable.

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A note on the moduli-induced gravitino problem

Cited by 5 publications

References 34 publications

String Cosmology: from the Early Universe to Today

String Cosmology: from the Early Universe to Today

Was the Universe actually radiation dominated prior to nucleosynthesis?

Suppression of parametric resonance and the viability of tachyonic preheating after multifield inflation

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