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|Type:||Artigo de periódico|
|Title:||D-dimensional radiative plasma: a kinetic approach|
|Abstract:||The covariant kinetic approach for the radiative plasma a mixture of a relativistic moving gas plus radiation quanta (photons, neutrinos or gravitons) is generalized to D spatial dimensions. The operational and physical meaning of Eckart's temperature is re-examined. The D-dimensional expressions for the transport coefficients (heat conduction, bulk and shear viscosity) are evaluated in dosed form. Weinberg's conclusion that the mixture behaves like a relativistic imperfect simple fluid (in Eckart's formulation) depends neither on the number of spatial dimensions nor on the details of the collisional term. The case of Thomson scattering is studied in detail. In the case where Thomson scattering dominates, the bulk viscosity is negligible regardless of the number of spatial dimensions. The interest of these results and some of their consequences for higher-dimensional cosmologies are also discussed.|
|Editor:||Iop Publishing Ltd|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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