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
Analytical attractor and the divergence of the slow-roll expansion in relativistic hydrodynamics
Sign Up to like & getrecommendations! Published in 2018 at "Physical Review D"
DOI: 10.1103/physrevd.97.056021
Abstract: We find the general analytical solution of the viscous relativistic hydrodynamic equations (in the absence of bulk viscosity and chemical potential) for a Bjorken expanding fluid with a constant shear viscosity relaxation time. We analytically… read more here.
Keywords: slow roll; roll expansion; attractor; hydrodynamics ... See more keywords
Primordial Spectra of slow-roll inflation at second-order with the Gauss-Bonnet correction
Sign Up to like & getrecommendations! Published in 2017 at "Physical Review D"
DOI: 10.1103/physrevd.97.103502
Abstract: The slow-roll inflation for a single scalar field that couples to the Gauss-Bonnet (GB) term represents an important higher-order curvature correction inspired by string theory. With the arrival of the era of precision cosmology, it… read more here.
Keywords: gauss bonnet; order; slow roll; roll inflation ... See more keywords
Gauss–Bonnet Inflation and the String Swampland
Sign Up to like & getrecommendations! Published in 2019 at "Universe"
DOI: 10.3390/universe5090200
Abstract: The swampland criteria are generically in tension with single-field slow-roll inflation because the first swampland criterion requires small tensor-to-scalar ratio while the second swampland criterion requires either large tensor-to-scalar ratio or large scalar spectral tilt.… read more here.
Keywords: swampland; tensor scalar; gauss bonnet; slow roll ... See more keywords