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Viscous modes, isocurvature perturbations and CMB initial conditions
When the predecoupling plasma is thermodinamically 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 perturb...
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| Lenguaje: | eng |
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2015
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| Acceso en línea: | https://dx.doi.org/10.1103/PhysRevD.91.061304 http://cds.cern.ch/record/1987179 |