Results 41 to 50 of about 6,154 (134)
Phase-Space Analysis of an Einstein–Gauss–Bonnet Scalar Field Cosmology
Mathematics, 2023 We perform a detailed study of the phase-space of the field equations of an Einstein–Gauss–Bonnet scalar field cosmology for a spatially flat Friedmann–Lemaître–Robertson–Walker spacetime.
Alfredo D. Millano +2 more
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$$f(\mathcal {R},\varphi ,\chi )$$ f(R,φ,χ) cosmology with Noether symmetry
European Physical Journal C: Particles and Fields, 2020 This paper is devoted to explore modified $$f(\mathcal {R})$$ f(R) theories of gravity using Noether symmetry approach. For this purpose, Friedmann–Robertson–Walker spacetime is chosen to investigate the cosmic evolution. The study is mainly divided into
M. Farasat Shamir
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How Nonassociative Geometry Describes a Discrete Spacetime
Frontiers in Physics, 2019 Nonassociative geometry, providing a unified description of discrete and continuum spaces, is a valuable candidate for the study of discrete models of spacetime. Within the framework of nonassociative geometry we propose a model of emergent spacetime. In
Alexander I. Nesterov, Héctor Mata
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Physics Letters B, 2022 We present a cosmological model arising from a gravitational theory with an infinite tower of higher-order curvature invariants that can reproduce the entire evolution of the Universe: from inflation to late-time acceleration, without invoking an ...
Luisa G. Jaime, Gustavo Arciniega
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Axion particle production in a laser-induced dynamical spacetime
Physics Letters B, 2018 We consider the dynamics of a charged particle (e.g., an electron) oscillating in a laser field in flat spacetime and describe it in terms of the variable mass metric.
M.A. Wadud +3 more
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Holographic evolution with dynamical boundary gravity
Journal of High Energy Physics, 2022 Holography has provided valuable insights into the time evolution of strongly coupled gauge theories in a fixed spacetime. However, this framework is insufficient if this spacetime is dynamical.
Christian Ecker +3 more
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Casimir effect and Stefan–Boltzmann law at finite temperature in a Friedmann–Robertson–Walker universe [PDF]
International Journal of Modern Physics D, 2020 A spatially flat Friedmann–Robertson–Walker background with a general scale factor is considered. In this spacetime, the energy–momentum tensor of the scalar field with a general curvature coupling parameter is obtained.
A. F. Santos +3 more
semanticscholar +1 more source
Effective lagrangian for a mass dimension one fermionic field in curved spacetime
Journal of High Energy Physics, 2018 In this work we use momentum-space techniques to evaluate the propagator G(x, x ′) for a spin 1/2 mass dimension one spinor field on a curved Friedmann-Robertson-Walker spacetime.
R.J. Bueno Rogerio +3 more
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Nonlinear dynamics from the relativistic Boltzmann equation in the Friedmann-Lemaître-Robertson-Walker spacetime [PDF]
, 2016 The dissipative dynamics of an expanding massless gas with constant cross section in a spatially flat Friedmann-Lema\^{\i}tre-Robertson-Walker (FLRW) universe is studied.
D. Bazow +5 more
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Dynamical wormholes in Einstein–Gauss–Bonnet gravity
European Physical Journal C: Particles and Fields, 2020 In the present work, we investigate evolving wormhole configurations in higher-dimensions, by adding a Gauss–Bonnet term to the standard Einstein–Hilbert action.
Mohammad Reza Mehdizadeh
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