Results 101 to 110 of about 58,534 (245)
Cosmological implications of the Weyl geometric gravity theory
European Physical Journal C: Particles and FieldsWe consider the cosmological implications of the Weyl geometric gravity theory. The basic action of the model is obtained from the simplest conformally invariant gravitational action, constructed, in Weyl geometry, from the square of the Weyl scalar, the
Tiberiu Harko, Shahab Shahidi
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Reheating in a modified teleparallel model of inflation
European Physical Journal C: Particles and Fields, 2019 We study the cosmological inflation and reheating in a teleparallel model of gravity. Reheating is assumed to be due to the decay of a scalar field to radiation during its rapid oscillation.
Parviz Goodarzi, H. Mohseni Sadjadi
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上海师范大学学报. 自然科学版, 2015 We study the cosmological inflation models driven by the rolling tachyon field which has a Born-Infeld-type action.We drive the Hamilton-Jacobi equation for the cosmological dynamics of tachyon inflation and the mode equations for the scalar and tensor ...
HU Zhijuan, YAN Aimin
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The Journal of Latin American and Caribbean Anthropology, Volume 31, Issue 2, June 2026.ABSTRACT This article examines the historical displacement of Indigenous peoples in Venezuela, focusing on the links between indigenist policies and the exploitation of natural resources, particularly oil, throughout the 20th century. Using a combined historical and ethnographic approach, it demonstrates how the formation of the Venezuelan nation‐state
Gabriel Tardelli
wiley +1 more source
Cosmic anisotropy with reduced relativistic gas
European Physical Journal C: Particles and Fields, 2018 The dynamics of cosmological anisotropies is investigated for Bianchi type I universe filled by a relativistic matter represented by the reduced relativistic gas model (RRG), with equation of state interpolating between radiation and matter.
Simpliciano Castardelli dos Reis +1 more
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Quantum coherence of cosmological perturbations
, 2017 The degrees of quantum coherence of cosmological perturbations of different spins are computed in the large-scale limit and compared with the standard results holding for a single mode of the electromagnetic field in an optical cavity.
Giovannini, Massimo
core +1 more source
Cosmological teleparallel perturbations
Journal of Cosmology and Astroparticle PhysicsAbstract There has been growing interest in f(ℚ) gravity, which has led to significant advancements in the field. However, it is important to note that most studies in this area were based on the coincident gauge, thus overlooking the impact of the connection degrees of freedom.
Heisenberg, Lavinia +2 more
openaire +3 more sources
Non‐Migrating Thermal Tides in the Martian Lower Atmosphere Observed by EMM/EMIRS
Journal of Geophysical Research: Planets, Volume 131, Issue 5, May 2026.Abstract Thermal tides significantly influence Martian atmospheric dynamics and radiative transfer. However, the excitation mechanisms of non‐migrating tides, exhibiting diverse spatial structures, remain poorly understood due to the limited number of observations.
Cong Sun +13 more
wiley +1 more source
Signature of f(R) gravity via Lemaître–Tolman–Bondi inhomogeneous perturbations
European Physical Journal C: Particles and FieldsWe analyze inhomogeneous cosmological models in the local Universe, described by the Lemaître–Tolman–Bondi (LTB) metric and developed using linear perturbation theory on a homogeneous and isotropic Universe background. Focusing on the different evolution
Tiziano Schiavone, Giovanni Montani
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Hamilton-Jacobi formalism of tachyon inflation and cosmological perturbations
上海师范大学学报. 自然科学版, 2014 We study the cosmological inflation models driven by the rolling tachyon field which has a Born-Infeld-type action.We drive the Hamilton-Jacobi equation for the cosmological dynamics of tachyon inflation and the mode equations for the scalar and tensor ...
LIU Daojun
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