Pre-thermalized gravitational waves
Sign Up to like & getrecommendations! Published in 2025 at "Journal of High Energy Physics"
DOI: 10.1007/jhep08(2025)125
Abstract: We investigate a novel gravitational wave (GW) production mechanism from gravitons generated during the pre-thermal phase of cosmic reheating, where the energy density is dominated by non-thermalized inflaton decay products, dubbed reheatons. We consider multiple… read more here.
Keywords: thermalized gravitational; pre thermalized; gravitational waves; inflaton ... See more keywords
Non-perturbative reheating and Nnaturalness
Sign Up to like & getrecommendations! Published in 2017 at "Journal of High Energy Physics"
DOI: 10.1007/jhep11(2017)125
Abstract: A bstractWe study models in which reheating happens only through non-perturbative processes. The energy transferred can be exponentially suppressed unless the inflaton is coupled to a particle with a parametrically small mass. Additionally, in some… read more here.
Keywords: energy; perturbative reheating; inflaton; mass ... See more keywords
Polonyi–Starobinsky supergravity with inflaton in a massive vector multiplet with DBI and FI terms
Sign Up to like & getrecommendations! Published in 2019 at "Classical and Quantum Gravity"
DOI: 10.1088/1361-6382/ab0901
Abstract: We propose the Starobinsky-type inflationary model in the matter-coupled N = 1 four-dimensional supergravity with the massive vector multiplet that has inflaton (scalaron) and goldstino amongst its field components, whose action includes the Dirac–Born–Infeld-type kinetic term and… read more here.
Keywords: vector multiplet; massive vector; supergravity; inflaton ... See more keywords
Supersymmetric ν-inflaton Dark Matter
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/04/037
Abstract: We present the supersymmetric extension of the unified model for inflation and Dark Matter studied in ref. [1]. The scenario is based on the incomplete decay of the inflaton field into right-handed (s)neutrino pairs. By… read more here.
Keywords: inflaton dark; inflaton; dark matter; supersymmetric inflaton ... See more keywords
Inflation is always semi-classical: diffusion domination overproduces Primordial Black Holes
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2021/12/027
Abstract: We use the Hamilton-Jacobi (H-J) formulation of stochastic inflation to describe the evolution of the inflaton during a period of Ultra-Slow Roll (USR), taking into account the field's velocity and its gravitational backreaction. We demonstrate… read more here.
Keywords: inflaton; primordial black; black holes; diffusion ... See more keywords
Pseudo-Nambu-Goldstone boson production from inflaton coupling during reheating
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2024/11/058
Abstract: The existence of pseudo-Nambu-Goldstone boson (pNGB) fields is a common feature in many models beyond the Standard Model, characterized by their exclusive derivative couplings. This paper investigates a scenario where a pNGB is coupled to… read more here.
Keywords: pseudo nambu; nambu goldstone; goldstone boson; inflaton ... See more keywords
Spectrum of high-frequency gravitational waves from graviton bremsstrahlung by the decay of inflaton: case with polynomial potential
Sign Up to like & getrecommendations! Published in 2024 at "Journal of Cosmology and Astroparticle Physics"
DOI: 10.1088/1475-7516/2025/02/041
Abstract: We study the generation of high-frequency gravitational waves (GWs) through graviton bremsstrahlung during the decay of inflaton in the post-inflationary universe, focusing on scenarios with a polynomial inflaton potential. Two main reheating channels are considered:… read more here.
Keywords: graviton bremsstrahlung; gravitational waves; inflaton; bremsstrahlung decay ... See more keywords
Homogeneous transitions during inflation: A description in quantum cosmology
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.063501
Abstract: 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. Even for large fluctuations, such as those… read more here.
Keywords: description; homogeneous transitions; inflaton; inflation ... See more keywords
Sub-Planckian ϕ2 inflation in the Palatini formulation of gravity with an R2 term
Sign Up to like & getrecommendations! Published in 2020 at "Physical Review D"
DOI: 10.1103/physrevd.101.123515
Abstract: The simplest model that can produce inflation is a massive noninteracting scalar particle with potential V=m2φ2/2. However, φ2 chaotic inflation is inconsistent with the observed upper bound on the tensor-to-scalar ratio, r. Recently it has… read more here.
Keywords: term; sub planckian; inflaton; inflation ... See more keywords
Quantum fluctuations and particle production in the oscillatory phase of a thermal inflaton in a FRW universe
Sign Up to like & getrecommendations! Published in 2019 at "Modern Physics Letters A"
DOI: 10.1142/s0217732320500224
Abstract: By the use of coherent and squeezed thermal states formalism, we analyzed the phenomena of particle creation when coherently oscillating a homogeneous scalar field (Inflaton) in semi-classical gravity. We also obtained an estimated solution for… read more here.
Keywords: quantum fluctuations; particle production; thermal states; inflaton ... See more keywords