Results 41 to 50 of about 49,682 (257)
Assisted Inflation in Bianchi VI0 Cosmologies [PDF]
General Relativity and Gravitation, 2002 11 ...
Aguirregabiria, J. M. +2 more
openaire +3 more sources
A new mechanism for freezing extra dimensions with higher-order curvature terms
Physics Letters B, 2020 We construct a model of higher dimensional cosmology in which extra dimensions are frozen by virtue of the cubic-order Lovelock gravity throughout the cosmic history from inflation to the present with radiation and matter-dominated regimes in between.
Hiroaki W.H. Tahara +2 more
doaj +1 more source
Constant-roll inflation in brane induced gravity cosmology
European Physical Journal C: Particles and Fields, 2022 In this article we study a constant-roll inflationary model in the context of the DGP brane-world cosmology caused by a quintessence scalar field. We determine an analytical solution for the Friedman equation coupled to the equation of motion of the ...
A. Ravanpak, G. F. Fadakar
doaj +1 more source
Universe, 2020 We investigate the ability of the exponential power-law inflation to be a phenomenologically correct model of the early universe. We study General Relativity (GR) scalar cosmology equations in Ivanov–Salopek–Bond (or Hamilton–Jacobi like) representation ...
Igor Fomin, Sergey Chervon
doaj +1 more source
, 1995 An exploratory study of the cosmology of moduli in string theory. Moduli are argued to be natural inflaton fields and lead to a robust inflationary cosmology in which inflation takes place at the top of domain walls. The amplitude of microwave background
A. Albrecht +54 more
core +2 more sources
Nearly Forgotten Cosmological Concept of E. B. Gliner
Universe, 2023 E. B. Gliner started his scientific career in 1963 at the age of 40. In 1965, when the existence of the cosmological constant λ seemed unnecessary to most cosmologists, he renewed interest in the problem by emphasizing a material interpretation of de ...
Dmitry Yakovlev, Alexander Kaminker
doaj +1 more source
Cosmology analogues in optical systems [PDF]
EPJ Web of Conferences, 2020 We discuss the possibility of exploiting polariton-exciton physics as an analogue experimental tool to study challenging ideas and existing problems arising in the context of gravity theory and theoretical cosmology.
Howard Eric
doaj +1 more source
, 2006 These lectures present a brief review of inflationary cosmology, provide an overview of the theory of cosmological perturbations, and then focus on the conceptual problems of the current paradigm of early universe cosmology, thus motivating an ...
Robert Brandenberger +1 more
core +3 more sources
Journal of High Energy Physics, 2021 We consider multiverse models in two-dimensional linear dilaton-gravity theories as toy models of false vacuum eternal inflation. Coupling conformal matter we calculate the Von Neumann entropy of subregions. When these are sufficiently large we find that
Sergio E. Aguilar-Gutierrez +4 more
doaj +1 more source
Inflationary cosmology in modified gravity theories
, 2015 We review inflationary cosmology in modified gravity such as $R^2$ gravity with its extensions in order to generalize the Starobinsky inflation model. In particular, we explore inflation realized by three kinds of effects: modification of gravity, the ...
Bamba, Kazuharu, Odintsov, Sergei D.
core +2 more sources