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How thermal inflation can save minimal hybrid inflation in supergravity

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How thermal inflation can save minimal hybrid inflation in supergravity. / Dimopoulos, Konstantinos; Owen, Charlotte.

In: Journal of Cosmology and Astroparticle Physics, Vol. 16, No. 10, 20, 12.10.2016.

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Dimopoulos, Konstantinos ; Owen, Charlotte. / How thermal inflation can save minimal hybrid inflation in supergravity. In: Journal of Cosmology and Astroparticle Physics. 2016 ; Vol. 16, No. 10.

Bibtex

@article{38b512187c9a406390cfaf7be1ffc4d8,
title = "How thermal inflation can save minimal hybrid inflation in supergravity",
abstract = "Minimal hybrid inflation in supergravity has been ruled out by the 2015 Planck observations because the spectral index of the produced curvature perturbation falls outside observational bounds. To resurrect the model, a number of modifications have been put forward but many of them spoil the accidental cancellation that resolves the η-problem and require complicated Kahler constructions to counterbalance the lost cancellation. In contrast, in this paper the model is rendered viable by supplementing the scenario with a brief period of thermal inflation, which follows the reheating of primordial inflation. The scalar field responsible for thermal inflation requires a large non-zero vacuum expectation value (VEV) and a flat potential. We investigate the VEV of such a flaton field and its subsequent effect on the inflationary observables. We find that, for large VEV, minimal hybrid inflation in supergravity produces a spectral index within the 1-σ Planck bound and a tensor-to-scalar ratio which may be observable in the near future. The mechanism is applicable to other inflationary models.",
keywords = "cosmic inflation, early universe, supersymmetry, COSMOLOGY",
author = "Konstantinos Dimopoulos and Charlotte Owen",
year = "2016",
month = oct,
day = "12",
doi = "10.1088/1475-7516/2016/10/020",
language = "English",
volume = "16",
journal = "Journal of Cosmology and Astroparticle Physics",
issn = "1475-7516",
publisher = "IOP Publishing",
number = "10",

}

RIS

TY - JOUR

T1 - How thermal inflation can save minimal hybrid inflation in supergravity

AU - Dimopoulos, Konstantinos

AU - Owen, Charlotte

PY - 2016/10/12

Y1 - 2016/10/12

N2 - Minimal hybrid inflation in supergravity has been ruled out by the 2015 Planck observations because the spectral index of the produced curvature perturbation falls outside observational bounds. To resurrect the model, a number of modifications have been put forward but many of them spoil the accidental cancellation that resolves the η-problem and require complicated Kahler constructions to counterbalance the lost cancellation. In contrast, in this paper the model is rendered viable by supplementing the scenario with a brief period of thermal inflation, which follows the reheating of primordial inflation. The scalar field responsible for thermal inflation requires a large non-zero vacuum expectation value (VEV) and a flat potential. We investigate the VEV of such a flaton field and its subsequent effect on the inflationary observables. We find that, for large VEV, minimal hybrid inflation in supergravity produces a spectral index within the 1-σ Planck bound and a tensor-to-scalar ratio which may be observable in the near future. The mechanism is applicable to other inflationary models.

AB - Minimal hybrid inflation in supergravity has been ruled out by the 2015 Planck observations because the spectral index of the produced curvature perturbation falls outside observational bounds. To resurrect the model, a number of modifications have been put forward but many of them spoil the accidental cancellation that resolves the η-problem and require complicated Kahler constructions to counterbalance the lost cancellation. In contrast, in this paper the model is rendered viable by supplementing the scenario with a brief period of thermal inflation, which follows the reheating of primordial inflation. The scalar field responsible for thermal inflation requires a large non-zero vacuum expectation value (VEV) and a flat potential. We investigate the VEV of such a flaton field and its subsequent effect on the inflationary observables. We find that, for large VEV, minimal hybrid inflation in supergravity produces a spectral index within the 1-σ Planck bound and a tensor-to-scalar ratio which may be observable in the near future. The mechanism is applicable to other inflationary models.

KW - cosmic inflation

KW - early universe

KW - supersymmetry

KW - COSMOLOGY

U2 - 10.1088/1475-7516/2016/10/020

DO - 10.1088/1475-7516/2016/10/020

M3 - Journal article

VL - 16

JO - Journal of Cosmology and Astroparticle Physics

JF - Journal of Cosmology and Astroparticle Physics

SN - 1475-7516

IS - 10

M1 - 20

ER -