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
Covariant single-field formulation of effective cosmological bounces
Sign Up to like & getrecommendations! Published in 2024 at "General Relativity and Gravitation"
DOI: 10.1007/s10714-025-03357-6
Abstract: This study explores the feasibility of an effective Friedmann equation in removing the classical Big Bang initial singularity and replacing it with a non-singular bounce occurring at a critical energy density value. In a spatially… read more here.
Keywords: covariant single; field formulation; critical energy; 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
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
Reconstructing the inflaton potential: primordial black holes and gravitational waves in slow roll and ultra slow roll single field inflation
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2025/01/154
Abstract: We present new single field inflationary scenarios that produce the critical abundance of primordial black holes as dark matter reconstructing the inflaton potential from an input power spectrum. The method is exact in the slow… read more here.
Keywords: roll; primordial black; slow roll; ultra slow ... See more keywords
Is the formation of primordial black holes from single-field inflation compatible with standard cosmology?
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/9rr3-ltbt
Abstract: In this work, we investigate the generation of primordial black holes (PBHs) within the framework of single-field inflationary models and their compatibility with the cosmological history of the Universe. Our results suggest that, depending on… read more here.
Keywords: field inflation; primordial black; cosmology; black holes ... 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
Shift-symmetric orbital inflation: Single field or multifield?
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.102.021302
Abstract: We present a new class of two-field inflationary attractor models, known as `shift-symmetric orbital inflation', whose behaviour is strongly multi-field but whose predictions are remarkably close to those of single-field inflation. In these models, the… read more here.
Keywords: field; single field; inflation; symmetric orbital ... 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
Full-shape analysis with simulation-based priors: Constraints on single field inflation from BOSS
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.110.063538
Abstract: Perturbative, or effective field theory (EFT)-based, full-shape analyses of galaxy clustering data involve ``nuisance parameters'' to capture various observational effects such as the galaxy-dark matter connection (galaxy bias). We present an efficient approach to set… read more here.
Keywords: field; analysis; based priors; full shape ... See more keywords
Is curvature-assisted quintessence observationally viable?
Sign Up to like & getrecommendations! Published in 2024 at "Physical Review D"
DOI: 10.1103/physrevd.110.106010
Abstract: Single-field models of accelerated expansion with nearly flat potentials, despite being able to provide observationally viable explanations for the early-time cosmic inflation and the late-time cosmic acceleration, are in strong tension with string theory evidence… read more here.
Keywords: accelerated expansion; curvature assisted; observationally viable; quintessence ... See more keywords