Results 21 to 30 of about 203,417 (295)
SSRN Electronic Journal, 2023 In cosmological special relativity theory, we study Maxwell equations, electromagnetic wave equations and functions. In the cosmological special theory of relativity, we study energy?momentum relations, the Klein-Gordon equation and wave functions. If we solve the Klein?Gordon equation, we obtain the Yukawa potential in the cosmological inertial frame.
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Coarse-grained cosmological perturbation theory [PDF]
Journal of Cosmology and Astroparticle Physics, 2012 Semi-analytical methods, based on Eulerian perturbation theory, are a promising tool to follow the time evolution of cosmological perturbations at small redshifts and at mildly nonlinear scales. All these schemes are based on two approximations: the existence of a smoothing scale and the single-stream approximation, where velocity dispersion of the ...
Pietroni, Massimo +3 more
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Non-minimal coupled warm inflation with quantum-corrected self-interacting inflaton potential
European Physical Journal C: Particles and Fields, 2022 In this work, we investigate the non-minimally coupled scenario in the context of warm inflation with quantum-corrected self-interacting potential. We transform the potential in the Jordan frame to the Einstein frame and consider a dissipation parameter ...
Daris Samart +3 more
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Proceedings of The European Physical Society Conference on High Energy Physics — PoS(EPS-HEP 2013), 2014 Plenary talk delivered at the European Physical Society Conference on High Energy Physics, 18-24 July, 2013, Stockholm ...
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Cosmological Perturbation Theory [PDF]
Progress of Theoretical Physics Supplement, 1984 The linear perturbation theory of spatially homogeneous and isotropic universes is reviewed and reformulated extensively. In the first half of the article, a gauge-invariant formulation of the theory is carried out with special attention paid to the geometrical meaning of the perturbation.
Hideo Kodama, Misao Sasaki
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Unimodular Approaches to the Cosmological Constant Problem
Universe, 2023 We review selected aspects of unimodular gravity and we discuss its viability as a solution of the old cosmological constant problem. In unimodular gravity, the cosmological constant is promoted to a global degree of freedom.
Pavel Jiroušek
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Anisotropic Fractional Cosmology: K-Essence Theory
Fractal and Fractional, 2023 In the particular configuration of the scalar field k-essence in the Wheeler–DeWitt quantum equation, for some age in the Bianchi type I anisotropic cosmological model, a fractional differential equation for the scalar field arises naturally.
José Socorro +2 more
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Universe, 2020 In this work, we study the impact of quantum entanglement on the two-point correlation function and the associated primordial power spectrum of mean square vacuum fluctuation in a bipartite quantum field theoretic system.
Sayantan Choudhury, Sudhakar Panda
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Quantum Fractionary Cosmology: K-Essence Theory
Universe, 2023 Using a particular form of the quantum K-essence scalar field, we show that in the quantum formalism, a fractional differential equation in the scalar field variable, for some epochs in the Friedmann–Lemaı^tre–Robertson–Walker (FLRW) model (radiation and
J. Socorro, J. Juan Rosales
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Perturbation theory in nonstandard cosmology [PDF]
, 2019 We study inhomogeneous perturbations away from the strongly homogeneous background cosmology previously studied. The problem is greatly simplified by using the mapping on the inner Schwarzschild solution.
Scharf, Günter
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