Results 11 to 20 of about 32,545 (270)
Inflating an Inhomogeneous Universe [PDF]
Journal of Cosmology and Astroparticle Physics, 2014 While cosmological inflation can erase primordial inhomogeneities, it is possible that inflation may not begin in a significantly inhomogeneous universe. This issue is particularly pressing in multifield scenarios, where even the homogeneous dynamics may
Easther, Richard +2 more
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Quantum creation of an Inhomogeneous universe [PDF]
Classical and Quantum Gravity, 2000 In this paper we study a class of inhomogeneous cosmological models which is a modified version of what is usually called the Lema\^itre-Tolman model. We assume that we have a space with 2-dimensional locally homogeneous spacelike surfaces.
Ashtekar A +19 more
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Neutrino Degeneracy and Chemically Inhomogeneous Universe [PDF]
Second international workshop on particle physics and the early universe (COSMO-98), 1999 A possibility that the universe may be strongly inhomogeneous chemically, while very smooth energetically, is considered. A possible mechanism which could lead to such a picture is a large and inhomogeneous lepton asymmetry.
Dolgov, A. D.
core +5 more sources
The Evolution of an Inhomogeneous Universe [PDF]
Physical Review D, 2014 A refined version of a recently introduced method for analysing the dynamics of an inhomogeneous irrotational dust universe is presented. A fully non-perturbative numerical computation of the time dependence of volume in this framework leads to the ...
Skarke, Harald
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The QCD phase transition in the inhomogeneous Universe [PDF]
Physical Review Letters, 2000 We investigate a new mechanism for the cosmological QCD phase transition: inhomogeneous nucleation. The primordial temperature fluctuations, measured to be $\delta T/T \sim 10^{-5}$, are larger than the tiny temperature interval, in which bubbles would ...
Ignatius, J., Schwarz, Dominik J.
core +6 more sources
Inhomogeneous universe in f(T) theory [PDF]
Gravitation and Cosmology, 2014 We obtain the equations of motions of the $f(T)$ theory considering the Lema tre-Tolman-Bondi's metric for a set of diagonal and non-diagonal tetrads. In the case of diagonal tetrads the equations of motion of the $f(T)$ theory impose a constant torsion or the same equations of the General Relativity, while in the case of non-diagonal set the ...
Rodrigues, Manuel E. +4 more
openaire +3 more sources
Isotropic expansion of an inhomogeneous universe [PDF]
Physical Review D, 2014 We propose a cosmological model that describes isotropic expansion of inhomogeneous universe. The energy-momentum tensor that creates the spatial inhomogeneity may not affect the uniform expansion scaling factor $a(t)$ in the FLRW-like metrics. Such energy-momentum tensor may not be exotic; in fact any linear or non-linear $ $-model has this feature ...
Geng, Wei-Jian, Lu, H.
openaire +2 more sources
Dark Photon Oscillations in Our Inhomogeneous Universe [PDF]
Physical Review Letters, 2020 5+8 pages, 3+6 figures; v2, added appendix on energy injection assumptions, minor updates to figures, results and conclusions unchanged; v3, minor changes, similar to version published in ...
Andrea Caputo +3 more
openaire +5 more sources
Light Propagation in Inhomogeneous Universe [PDF]
, 1999 3 pages, gzip'ed tar file, including TeX source (not Latex). To be published in a periodical of the Yukawa Institute for Theoretical Physics (1998)
Premadi, Premana W. +2 more
openaire +3 more sources
An inhomogeneous model universe behaving homogeneously [PDF]
General Relativity and Gravitation, 2008 We present a new model universe based on the junction of FRW to flat Lemaitre-Tolman-Bondi (LTB) solutions of Einstein equations along our past light cone, bringing structures within the FRW models. The model is assumed globally to be homogeneous, i.e. the cosmological principle is valid.
Khosravi, Sh. +3 more
openaire +3 more sources