Gravitino constraints on supergravity inflation

Kawai, Shinsuke; Okada, Nobuchika

doi:10.1103/physrevd.105.l101302

Cited by 6 publications

(1 citation statement)

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“…Assuming a constant equation of state parameter wre (or a given parameterization) during reheating, one can compute the dependence of (T re , N re ) on n s or r, for instance, as shown in figure 4. This method has been used for minimally coupled models with monomial potentials and for the α-attractor scenario, but recently, applications to non-minimally coupled models have appeared [52,74], showing how the presence of the coupling might affect the post-inflationary parameters. We have obtained an interval of approximately 20 < N re < 50 for the duration of the reheating, when wre = 0, which also imposes a constraint on N at horizon crossing, as seen in figure 5.…”

Section: Jcap08(2022)002mentioning

confidence: 99%

Revisiting Witten-O'Raifeartaigh inflation for a non-minimally coupled scalar field

Santos

2022

J. Cosmol. Astropart. Phys.

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In this work, we revisit the Witten-O'Raifeartaigh model of inflation, in which the potential takes a log2(ϕ/M) form, when the scalar field is non-minimally coupled to gravity. We investigate the impact of the coupling in the prediction of the inflationary parameters, thereby affecting the viability of the model. We find that a small coupling of order ξ ∼ 10-3 is preferred by data at the ns-r plane level, and that the presence of a non-zero ξ allows for a large interval of the mass scale M, in which it is possible to achieve a low tensor-to-scalar ratio. We also establish constraints imposed by a subsequent reheating era, in which its duration and temperature can be related to CMB observables, which in return, restricts the possible values for the ns and r parameters.

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Section: Jcap08(2022)002mentioning

confidence: 99%