Red spectral tilt and observable gravity waves in shifted hybrid inflation

Civiletti, Matthew; Rehman, Mansoor Ur; Shafi, Qaisar; Wickman, Joshua R.

doi:10.1103/physrevd.84.103505

Cited by 25 publications

(22 citation statements)

References 33 publications

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“…[46] but also large r T = O(0.1), in contrast with the previous work [47] where the possibility of r T ≃ 0.02 has been pointed out.…”

Section: Introductioncontrasting

confidence: 50%

“…In this paper, we show if the secondary inflation takes place with a sufficient number of e-folds, say N ≃ 40 − 50, a kind of supersymmetric hybrid inflation is available and could generate not only an appropriate density perturbation and its spectrum as in Ref. [46] but also large r T = O(0.1), in contrast with the previous work [47] where the possibility of r T ≃ 0.02 has been pointed out.…”

Section: Introductionmentioning

confidence: 61%

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Beginning of Universe through large field hybrid inflation

Kobayashi

Seto

2015

Mod. Phys. Lett. A

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Recent detection of B-mode polarization induced from tensor perturbations by the BICEP2 experiment implies so-called large field inflation, where an inflaton field takes super-Planckian expectation value during inflation, at a high energy scale. We show however, if another inflation follows hybrid inflation, the hybrid inflation can generate a large tensor perturbation with not super-Plankian but Planckian field value. This scenario would relax the tension between BICEP2and Planck concerning the tensor-to-scalar ratio, because a negative large running can also be obtained for a certain number of e-fold of the hybrid inflation. A natural interpretation of a large gravitational wave mode with or without the scalar spectral running might be multiple inflation in the early Universe.

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“…[46] but also large r T = O(0.1), in contrast with the previous work [47] where the possibility of r T ≃ 0.02 has been pointed out.…”

Section: Introductioncontrasting

confidence: 50%

Section: Introductionmentioning

confidence: 61%

Beginning of Universe through large field hybrid inflation

Kobayashi

Seto

2015

Mod. Phys. Lett. A

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“…For the predictions of standard, shifted and smooth hybrid inflation with a conjugate pair of chiral Higgs superfields and non-minimal Kähler potential see refs. [19]- [23]. It can be seen from the Figs.…”

Section: + 2κmentioning

confidence: 81%

Simplified smooth hybrid inflation in supersymmetricSU(5)

Rehman

Zubair

2015

Phys. Rev. D

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A scheme of simplified smooth hybrid inflation is realized in the framework of supersymmetric SU (5). The smooth model of hybrid inflation provides a natural solution to the monopole problem that appears in the breaking of SU (5) gauge symmetry. The supergravity corrections with nonminimal Kähler potential are shown to play important role in realizing inflation with a red-tilted scalar spectral index n s < 1, within Planck's latest bounds. As compared to shifted model of hybrid inflation, relatively large values of the tensor-to-scalar ratio r 0.01 are achieved here, with nonminimal couplings −0.05 κ S 0.01 and −1 κ SS 1 and the gauge symmetry-breaking scale M ≃ (2.0 − 16.7) × 10 16 GeV.

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“…With a non-minimal Kähler potential it is possible to realize r values as large as 0.02 or so [4], which can be measured by Planck. r 0.02 for n s ≥ 0.96 -SUSY Higgs (Hybrid) Inflation: r 10 −10 (minimal), r 0.02 (non-minimal)…”

Section: Non-minimal Hybrid Inflationmentioning

confidence: 99%

Will Planck Observe Gravity Waves?

Shafi¹

2014

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP 2013)

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Assume that inflation is driven by a gauge singlet scalar field with a Higgs potential. The tensor to scalar ratio r, a canonical measure of gravity waves generated during inflation, turns out in this case to be 0.02, provided the scalar spectral index n s ≥ 0.96. Thus, Planck or some other comparable experiment should observe r sooner or later. In minimal supersymmetric hybrid inflation, on the other hand, r ∼ 10 −10 , and therefore lies well below the reach of Planck and any foreseeable experiment. Observable r values, ∼ 0.02 or so, are realized in non-minimal versions of supersymmetric hybrid inflation.

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Red spectral tilt and observable gravity waves in shifted hybrid inflation

Cited by 25 publications

References 33 publications

Beginning of Universe through large field hybrid inflation

Beginning of Universe through large field hybrid inflation

Simplified smooth hybrid inflation in supersymmetricSU(5)

Will Planck Observe Gravity Waves?

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