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      Density perturbations with relativistic thermodynamics

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          Abstract

          We investigate cosmological density perturbations in a covariant and gauge-invariant formalism, incorporating relativistic causal thermodynamics to give a self-consistent description. The gradient of density inhomogeneities splits covariantly into a scalar part, equivalent to the usual density perturbations, a rotational vector part that is determined by the vorticity, and a tensor part that describes the shape. We give the evolution equations for these parts in the general dissipative case. Causal thermodynamics gives evolution equations for viscous stress and heat flux, which are coupled to the density perturbation equation and to the entropy and temperature perturbation equations. We give the full coupled system in the general dissipative case, and simplify the system in certain cases. A companion paper uses the general formalism to analyze damping of density perturbations before last scattering.

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          Author and article information

          Journal
          08 July 1997
          1997-09-12
          Article
          10.1103/PhysRevD.56.4640
          gr-qc/9707018
          1dbf9725-36d7-4247-b00a-974c9f696788
          History
          Custom metadata
          Phys.Rev. D56 (1997) 4640-4650
          Minor corrections to some equations. To appear Phys. Rev. D
          gr-qc astro-ph

          General relativity & Quantum cosmology,General astrophysics
          General relativity & Quantum cosmology, General astrophysics

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