Results 71 to 80 of about 19,573 (204)
Relic gravity waves and 7 keV dark matter from a GeV scale inflaton
Physics Letters B, 2014 We study the mechanism of generation of 7 keV sterile neutrino Dark Matter (DM) in the model with light inflaton χ, which serves as a messenger of scale invariance breaking.
F.L. Bezrukov, D.S. Gorbunov
doaj +1 more source
Is nonperturbative inflatino production during preheating a real threat to cosmology? [PDF]
, 2001 We discuss toy models where supersymmetry is broken due to non-vanishing time-varying vacuum expectation value of the inflaton field during preheating.
A. Albrecht +34 more
core +3 more sources
Observable signatures of inflaton decays [PDF]
Journal of Cosmology and Astroparticle Physics, 2011 26 pages, 5 ...
Battefeld, Diana +3 more
openaire +3 more sources
Two Micron‐Size Dark Dimensions
Fortschritte der Physik, Volume 73, Issue 8, August 2025.Abstract Two extra dimensions of micron scale might simultaneously address the gauge and cosmological hierarchy problems. In this paper various observational bounds in scenarios with one and two large extra dimensions are examined, to see if they are compatible with the micron scale.
Luis A. Anchordoqui +2 more
wiley +1 more source
The Importance of Scalar Fields as Extradimensional Metric Components in Kaluza‐Klein Models
Advances in Astronomy, Volume 2019, Issue 1, 2019., 2019 Extradimensional models are achieving their highest popularity nowadays, among other reasons, because they can plausible explain some standard cosmology issues, such as the cosmological constant and hierarchy problems. In extradimensional models, we can infer that the four‐dimensional matter rises as a geometric manifestation of the extra coordinate ...
P. H. R. S. Moraes +2 more
wiley +1 more source
R-symmetric axion/natural inflation in supergravity via deformed moduli dynamics
Physics Letters B, 2014 We construct a natural inflation model in supergravity where the inflaton is identified with a modulus field possessing a shift symmetry. The superpotential for the inflaton is generated by meson condensation due to strong dynamics with deformed moduli ...
Keisuke Harigaya +2 more
doaj +1 more source
Recent Developments in Degenerate Higher Order Scalar Tensor Theories
Annalen der Physik, Volume 537, Issue 2, February 2025.Degenerate Higher Order Scalar Tensor theories are reviewed, together with their applications in cosmology and astrophysics. These theories have been applied to build models of the early universe, in the description of the late‐time cosmic acceleration, as well as in astrophysics, including black hole physics. They have the potential to provide answers
Andrei Lazanu
wiley +1 more source
More on the Non‐Gaussianity of Perturbations in a Nonminimal Inflationary Model
Advances in High Energy Physics, Volume 2018, Issue 1, 2018., 2018 We study nonlinear cosmological perturbations and their possible non‐Gaussian character in an extended nonminimal inflation where gravity is coupled nonminimally to both the scalar field and its derivatives. By expansion of the action up to the third order, we focus on the nonlinearity and non‐Gaussianity of perturbations in comparison with recent ...
R. Shojaee +3 more
wiley +1 more source
Journal of High Energy Physics, 2021 In traditional models only an order one fraction of energy is transferred from the inflaton to radiation through nonperturbative resonance production in preheating immediately after inflation, due to backreaction effects. We propose a particle production
JiJi Fan, Kaloian D. Lozanov, Qianshu Lu
doaj +1 more source
Species Scale and Primordial Gravitational Waves
Fortschritte der Physik, Volume 72, Issue 6, June 2024.Abstract The species scale is a field‐dependent UV cut‐off for any effective field theory weakly coupled to gravity. In this letter, it is shown that in the context of inflationary cosmology, a detection of primordial gravitational waves will set an upper bound on the decay rate |Λs′/Λs|$|\Lambda ^{\prime }_s/\Lambda _s|$ of the species scale ...
Marco Scalisi
wiley +1 more source