Small free field inflation in higher curvature gravity
Sign Up to like & getrecommendations! Published in 2020 at "Journal of High Energy Physics"
DOI: 10.1007/jhep01(2021)029
Abstract: Within General Relativity, a minimally coupled scalar field governed by a quadratic potential is able to produce an accelerated expansion of the universe provided its value and excursion are larger than the Planck scale. This… read more here.
Keywords: field; higher curvature; inflation; small free ... See more keywords
Perturbative unitarity in quasi-single field inflation
Sign Up to like & getrecommendations! Published in 2021 at "Journal of High Energy Physics"
DOI: 10.1007/jhep07(2021)018
Abstract: Abstract We study implications of perturbative unitarity for quasi-single field inflation with the inflaton and one massive scalar. Analyzing high energy scattering, we show that non-Gaussianities with |fNL| ≳ 1 cannot be realized without turning… read more here.
Keywords: perturbative unitarity; quasi single; field inflation; single field ... See more keywords
Compactly supported linearised observables in single-field inflation
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2017/07/043
Abstract: We investigate the gauge-invariant observables constructed by smearing the graviton and inflaton fields by compactly supported tensors at linear order in general single-field inflation. These observables correspond to gauge-invariant quantities that can be measured locally.… read more here.
Keywords: gauge invariant; field inflation; single field; compactly supported ... See more keywords
Inhomogeneous initial data and small-field inflation
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/05/026
Abstract: We consider the robustness of small-field inflation in the presence of scalar field inhomogeneities. Previous numerical work has shown that if the scalar potential is flat only over a narrow interval, such as in commonly… read more here.
Keywords: field inflation; cosmology; small field; inflation ... See more keywords
Unsuppressed Primordial Standard Clocks in Warm Quasi-single Field Inflation
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/06/013
Abstract: We study the non-Gaussianities in quasi-single field inflation with a warm inflation background. The thermal effects at small scales can sufficiently enhance the magnitude of the primordial standard clock signal. This scenario offers us the… read more here.
Keywords: field inflation; field; quasi single; primordial standard ... See more keywords
Many-field inflation: universality or prior dependence?
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2020/04/021
Abstract: We investigate the observational signatures of many-field inflation and present analytic expressions for the spectral index as a function of the prior. For a given prior we employ the central limit theorem and the horizon… read more here.
Keywords: field inflation; inflation universality; universality prior; many field ... See more keywords
Bootstrapping multi-field inflation: non-Gaussianities from light scalars revisited
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2023/05/043
Abstract: Primordial non-Gaussianities from multi-field inflation are a leading target for cosmological observations, because of the possible large correlations generated between long and short distances. These signatures are captured by the local shape of the scalar… read more here.
Keywords: field inflation; non gaussianities; multi field; seed ... See more keywords
New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons
Sign Up to like & getrecommendations! Published in 2019 at "Physical Review D"
DOI: 10.1103/physrevd.100.043534
Abstract: We study a simple extension of quasi-single field inflation in which the inflaton interacts with multiple extra massive scalars known as isocurvatons. Due to the breaking of time translational invariance by the inflaton background, the… read more here.
Keywords: single field; inflation; field inflation; multiple isocurvatons ... See more keywords
Note on initial conditions for small-field inflation
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.103510
Abstract: We show that initial conditions for small-field inflation can be determined quantum mechanically by introducing a suitable flattened region in the scalar potential. The inflaton is then driven toward the slow-roll attractor solution exponentially fast,… read more here.
Keywords: conditions small; initial conditions; inflation; small field ... See more keywords
Primordial black holes from Gauss-Bonnet-corrected single field inflation
Sign Up to like & getrecommendations! Published in 2021 at "Physical Review D"
DOI: 10.1103/physrevd.104.083545
Abstract: Primordial blackholes formed in the early Universe via gravitational collapse of over-dense regions may contribute a significant amount to the present dark matter relic density. Inflation provides a natural framework for the production mechanism of… read more here.
Keywords: field inflation; primordial blackholes; gauss bonnet; single field ... See more keywords
Effect of reheating on predictions following multiple-field inflation
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.97.023511
Abstract: We study the sensitivity of cosmological observables to the reheating phase following inflation driven by many scalar fields. We describe a method which allows semianalytic treatment of the impact of perturbative reheating on cosmological perturbations… read more here.
Keywords: field inflation; following multiple; multiple field; inflation ... See more keywords