Moduli dynamics in effective nested warped geometry in four dimensions and some cosmological implications
Sign Up to like & getrecommendations! Published in 2024 at "Journal of High Energy Physics"
DOI: 10.1007/jhep09(2024)003
Abstract: We analyze the effective four-dimensional dynamics of the extra-dimensional moduli fields in curved braneworlds having nested warping, with particular emphasis on the doubly warped model which is interesting in the light of current collider constraints… read more here.
Keywords: moduli dynamics; dynamics effective; nested warped; slow roll ... See more keywords
Hurricanes slow their roll around the world
Sign Up to like & getrecommendations! Published in 2018 at "Nature"
DOI: 10.1038/d41586-018-05324-5
Abstract: Storms' slowdown means more rain, and potentially more damage, for populated areas.Storms' slowdown means more rain, and potentially more damage, for populated areas. read more here.
Keywords: slow roll; around world; hurricanes slow; roll around ... See more keywords
Mechanisms for Primordial Black Hole Production in String Theory
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/07/005
Abstract: We consider mechanisms for producing a significant population of primordial black holes (PBHs) within string inspired single field models of inflation. The production of PBHs requires a large amplification in the power spectrum of curvature… read more here.
Keywords: slow roll; production; primordial black; models inflation ... See more keywords
The attractive behaviour of ultra-slow-roll inflation
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2018/08/048
Abstract: It is often claimed that the ultra-slow-roll regime of inflation, where the dynamics of the inflaton field are friction dominated, is a non-attractor and/or transient. In this work we carry out a phase-space analysis of… read more here.
Keywords: attractive behaviour; slow roll; roll; behaviour ultra ... See more keywords
Failure of the stochastic approach to inflation beyond slow-roll
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2019/03/048
Abstract: After giving a pedagogical review we clarify that the stochastic approach to inflation is generically reliable only at zeroth order in the (geometrical) slow-roll parameter 1 if and only if 22 6/1, with the notable… read more here.
Keywords: approach inflation; stochastic approach; slow roll; approach ... See more keywords
No slow-roll inflation à la generalized Chaplygin gas in general relativity
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2020/12/044
Abstract: The Generalized Chaplygin Gas (GCG) model is characterized by the equation of state $P = -A \rho^{-\alpha}$, where $A>0$ and $\alpha < 1$. The model has been extensively studied due to its interesting properties and… read more here.
Keywords: slow roll; model; inflation; generalized chaplygin ... See more keywords
Dynamical consistency conditions for rapid turn inflation
Sign Up to like & getrecommendations! Published in 2022 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2023/05/020
Abstract: We derive consistency conditions for sustained slow roll and rapid turn inflation in two-field cosmological models with oriented scalar field space, which imply that inflationary models with field-space trajectories of this type are non-generic. In… read more here.
Keywords: rapid turn; consistency conditions; turn inflation; slow roll ... See more keywords
Cosmic Inflation at the crossroads
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/07/087
Abstract: The capability of Cosmic Inflation to explain the latest Cosmic Microwave Background and Baryonic Acoustic Oscillation data is assessed by performing Bayesian model comparison within the landscape of nearly three-hundred models of single-field slow-roll inflation.… read more here.
Keywords: cosmic inflation; inflation; slow roll; inflation crossroads ... See more keywords
New slow-roll approximations for inflation in Einstein-Gauss-Bonnet gravity
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/09/050
Abstract: We propose new slow-roll approximations for inflationary models with the Gauss-Bonnet term. We find more accurate expressions of the standard slow-roll parameters as functions of the scalar field. To check the accuracy of approximations considered… read more here.
Keywords: inflationary models; roll approximations; roll; new slow ... See more keywords
Modular invariant slow roll inflation
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/10/016
Abstract: We propose new classes of inflation models based on the modular symmetry, where the modulus field τ serves as the inflaton. We establish a connection between modular inflation and modular stabilization, wherein the modulus field… read more here.
Keywords: modular invariant; inflation; slow roll; inflation modular ... See more keywords
Comparing sharp and smooth transitions of the second slow-roll parameter in single-field inflation
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/10/036
Abstract: In single-field inflation, violation of the slow-roll approximation can lead to growth of curvature perturbation outside the horizon. This violation is characterized by a period with a large negative value of the second slow-roll parameter.… read more here.
Keywords: roll; inflation; slow roll; perturbation ... See more keywords