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High Energy Physics - Theory

arXiv:1503.08739 (hep-th)
[Submitted on 30 Mar 2015 (v1), last revised 14 Jul 2015 (this version, v2)]

Title:Non-linear curvature inhomogeneities and backreaction for relativistic viscous fluids

Authors:Massimo Giovannini
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Abstract:The non-perturbative curvature inhomogeneities induced by relativistic viscous fluids are not conserved in the large-scale limit. However when the bulk viscosity is a function of the total energy density of the plasma (or of the trace of the extrinsic curvature) the relevant evolution equations develop a further symmetry preventing the non-linear growth of curvature perturbations. In this situation the fully inhomogeneous evolution can be solved to leading order in the gradient expansion. Over large-scales both the acceleration and the curvature inhomogeneities are determined by the bulk viscosity coefficients. Conversely the shear viscosity does not affect the evolution of the curvature and does not produce any acceleration. The curvature modes analyzed here do not depend on the choice of time hypersurfaces and are invariant for infinitesimal coordinate transformations in the perturbative regime.
Comments: 25 pages, no figures; corrected typos to match the published version
Subjects: High Energy Physics - Theory (hep-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics - Phenomenology (hep-ph)
Report number: CERN-PH-TH/2015-068
Cite as: arXiv:1503.08739 [hep-th]
  (or arXiv:1503.08739v2 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.1503.08739
Journal reference: Class.Quant.Grav. 32 (2015) 15, 155004
Related DOI: https://doi.org/10.1088/0264-9381/32/15/155004

Submission history

From: Massimo Giovannini [view email]
[v1] Mon, 30 Mar 2015 16:46:19 UTC (22 KB)
[v2] Tue, 14 Jul 2015 09:49:05 UTC (22 KB)
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