Moduli Stabilisation for Chiral Global Models

Cicoli, Michele; Mayrhofer, Christoph; Valandro, Roberto

doi:10.48550/arxiv.1110.3333

Cited by 30 publications

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“…Then τ b is the lightest modulus as before and its axionic partner a b is a nearly massless DR candidate (see (2.2)). An explicit example for a construction of this type is given in [34].…”

Section: Visible Sector Cycle Stabilisation By D-termsmentioning

confidence: 99%

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Dark Radiation predictions from general Large Volume Scenarios

Hebecker

Mangat

Rompineve

et al. 2014

J. High Energ. Phys.

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Recent observations constrain the amount of Dark Radiation (∆N eff ) and may even hint towards a non-zero value of ∆N eff . It is by now well-known that this puts stringent constraints on the sequestered Large Volume Scenario (LVS), i.e. on LVS realisations with the Standard Model at a singularity. We go beyond this setting by considering LVS models where SM fields are realised on 7-branes in the geometric regime. As we argue, this naturally goes together with high-scale supersymmetry. The abundance of Dark Radiation is determined by the competition between the decay of the lightest modulus to axions, to the SM Higgs and to gauge fields, and leads to strict constraints on these models. Nevertheless, these constructions can in principle meet current DR bounds due to decays into gauge bosons alone. Further, a rather robust prediction for a substantial amount of Dark Radiation can be made. This applies both to cases where the SM 4-cycles are stabilised by D-terms and are small 'by accident', i.e. tuning, as well as to fibred models with the small cycles stabilised by loops. In these constructions the DR axion and the QCD axion are the same field and we require a tuning of the initial misalignment to avoid Dark Matter overproduction. Furthermore, we analyse a closely related setting where the SM lives at a singularity but couples to the volume modulus through flavour branes. We conclude that some of the most natural LVS settings with natural values of model parameters lead to Dark Radiation predictions just below the present observational limits. Barring a discovery, rather modest improvements of present Dark Radiation bounds can rule out many of these most simple and generic variants of the LVS.

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Section: Visible Sector Cycle Stabilisation By D-termsmentioning

confidence: 99%

“…If some cycles have been stabilised by D-terms, we assume that this is the volume after the moduli stabilised by D-terms have been integrated out [34,42].…”

Section: Visible Sector Cycle Stabilisation By String Loop Correctionsmentioning

confidence: 99%

Dark Radiation predictions from general Large Volume Scenarios

Hebecker

Mangat

Rompineve

et al. 2014

J. High Energ. Phys.

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“…String compactifications that we are going to discuss include O3/O7-planes and the following small cycles [6,26]: The low-energy effective field theory is an N = 1 supergravity which is completely specified in terms of the real Kähler potential K, the holomorphic superpotential W and the gauge kinetic functions f a (a refers to different gauge groups). The Kähler potential reads (including the leading α ′ correction proportional to the constant ξ [27]):…”

Section: Setup Of the Compactificationmentioning

confidence: 99%

Affleck-Dine baryogenesis in type IIB string models

Allahverdi

Cicoli

Muia

2016

J. High Energ. Phys.

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Abstract:We propose a possible string embedding of Affleck-Dine baryogenesis in type IIB sequestered models where the late-time decay of the lightest modulus reheats the universe to relatively low temperatures. We show that if inflation is driven by a blow-up Kähler modulus, the Affleck-Dine field can become tachyonic during inflation if the Kähler metric for matter fields has an appropriate inflaton-dependent contribution. We find that the Affleck-Dine mechanism can generate the observed baryon asymmetry for natural values of the underlying parameters which lead also to successful inflation and low-energy gaugino masses in a split supersymmetry scenario. The reheating temperature from the lightest modulus decay is high enough to allow thermal Higgsino-like dark matter.

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“…This argument is however not a proof that the SM has to live at a singularity since there are two ways out: the FI term is model dependent and usually is a linear combination of moduli fields. There may be a way to engineer the models so that these combinations vanish with nonvanishing fields (see for instance [39]). Furthermore the soft terms contributions to the matter fields φ i may be tachyonic and then φ i = 0 at the minimum.…”

Section: Local and Global Model Buildingmentioning

confidence: 99%

Local string models and moduli stabilisation

Quevedo

2015

Mod. Phys. Lett. A

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A brief overview is presented of the progress made during the past few years on the general structure of local models of particle physics from string theory including: moduli stabilisation, supersymmetry breaking, global embedding in compact Calabi-Yau compactifications and potential cosmological implications. Type IIB D-brane constructions and the Large Volume Scenario (LVS) are discussed in some detail emphasising the recent achievements and the main open questions.

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Moduli Stabilisation for Chiral Global Models

Cited by 30 publications

References 0 publications

Dark Radiation predictions from general Large Volume Scenarios

Dark Radiation predictions from general Large Volume Scenarios

Affleck-Dine baryogenesis in type IIB string models

Local string models and moduli stabilisation

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