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Viscous modes, isocurvature perturbations, and CMB initial conditions

Massimo Giovannini
Phys. Rev. D 91, 061304(R) – Published 27 March 2015

Abstract

When the predecoupling plasma is thermodynamically reversible its fluctuations are classified in terms of the adiabatic and entropic modes. A different category of physical solutions, so far unexplored, arises when the inhomogeneities of the viscosity coefficients induce computable curvature perturbations. The viscous modes are explicitly illustrated and compared with the conventional isocurvature solutions.

  • Received 5 February 2015

DOI:https://doi.org/10.1103/PhysRevD.91.061304

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Authors & Affiliations

Massimo Giovannini*

  • Department of Physics, Theory Division, CERN, 1211 Geneva 23, Switzerland and INFN, Section of Milan-Bicocca, 20126 Milan, Italy

  • *massimo.giovannini@cern.ch

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Issue

Vol. 91, Iss. 6 — 15 March 2015

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