Results 121 to 130 of about 19,573 (204)

Reheating of the Universe as holographic thermalization

Physics Letters B, 2016
Assuming gauge/gravity correspondence we study reheating of the Universe using its holographic dual. Inflaton decay and thermalisation of the decay products correspond to collapse of a spherical shell and formation of a blackhole in the dual anti-de ...
Shinsuke Kawai, Yu Nakayama
doaj   +1 more source

An exact solution approach to warm inflation using Tsallis and Barrow holographic dark energy entropy within Rastall gravity. [PDF]

Eur Phys J Plus, 2022
Saleem R, Shahid I, Sabir M.
europepmc   +1 more source

Hillclimbing saddle point inflation

Physics Letters B, 2018
Recently a new inflationary scenario was proposed in [1] which can be applicable to an inflaton having multiple vacua. In this letter, we consider a more general situation where the inflaton potential has a (UV) saddle point around the Planck scale. This
Kiyoharu Kawana, Katsuta Sakai
doaj   +1 more source

Stochastic Gravitational Waves from Inflaton Decays

, 2019
Due to the universality of gravitational interactions, it is generally expected that a stochastic gravitational wave (GW) background could form during the reheating period when the inflaton perturbatively decays with the emission of gravitons. Previously,
Huang, Da, Yin, Lu
core   +1 more source

Dark Matter from the Inflaton Field

, 2012
We present a model where inflation and Dark Matter takes place via a single scalar field phi. Without introducing any new parameters we are able unify inflation and Dark Matter using a scalar field phi that accounts for inflation at an early epoch while ...
A. de la Macorra, Abazajian, Adelman-McCarthy, Allahverdi, Astier, Astier, Baacke, Bertone, Cole, Colin, de la Macorra, de la Macorra, Dolgov, Dufaux, Felder, Felder, German, German, Giudice, Greene, Greene, Greene, Ichikawa, Jungman, Kawasaki, Khlebnikov, Kofman, Kofman, Komatsu, Liddle, Lyth, Mangano, Mazumdar, Micha, Micha, Michael Wood-Vasey, Miknaitis, Peloso, Prokopec, Riess, Riess, Tegmark, Tegmark, Traschen, Viel   +44 more
core   +1 more source

Homogeneous Transitions during Inflation: a Description in Quantum Cosmology

, 2019
The usual description of inflationary fluctuations uses the framework of quantum field theory (QFT) in curved spacetime, in which quantum fluctuations are superimposed on a classical background spacetime.
Bramberger, S., Di Tucci, A., Lehners, J.   +2 more
core   +2 more sources

Hillclimbing inflation in metric and Palatini formulations

Physics Letters B, 2019
A new setup of cosmic inflation with a periodic inflaton potential and conformal factor is discussed in the metric and Palatini formulations of gravity.
Ryusuke Jinno, Kunio Kaneta, Kin-ya Oda, Seong Chan Park   +3 more
doaj   +1 more source

Constraining barrow entropy-based cosmology with power-law inflation. [PDF]

Eur Phys J C Part Fields, 2023
Luciano GG.
europepmc   +1 more source

Signature of short distance physics on inflation power spectrum and CMB anisotropy

, 2009
The inflaton field responsible for inflation may not be a canonical fundamental scalar. It is possible that the inflaton is a composite of fermions or it may have a decay width.
A. Lewis, A. Riotto, G. Barenboim, G. Källén, L. Verde, N. Kogo, R.K. Jain, S. Weinberg, Subhendra Mohanty, Suratna Das, WMAP collaboration, Z.-Y. Huang   +11 more
core   +1 more source

Unitarity problems for an effective field theory description of early universe cosmology. [PDF]

Eur Phys J C Part Fields, 2022
Brandenberger R, Kamali V.
europepmc   +1 more source