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Type: Artigo de periódico
Author: LIMA, JAS
Abstract: The thermodynamic behavior of a relativistic perfect simple fluid obeying the equation of state p = (gamma - 1)rho, where 0 less than or equal to gamma less than or equal to 2 is a constant, is investigated. Particular cases include a vacuum (p = -rho, gamma = 0), a randomly oriented distribution of cosmic strings (p = -1/3 rho, gamma = 2/3), blackbody radiation (p = -1/3 rho, gamma = 4/3), and stiff matter (p = rho, gamma = 2). Fluids with gamma < 1 become hotter when they expand adiabatically (T proportional to V1-gamma). By assuming that such fluids may be regarded as a kind of generalized radiation, the general Planck-type form of the spectrum is deduced. As a Limiting case, a new Lorentz-invariant spectrum of the vacuum which is compatible with the equation of state and other thermodynamic constraints is proposed. Some possible consequences to early universe physics are also discussed.
Country: EUA
Editor: American Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevD.52.5628
Date Issue: 1995
Appears in Collections:Unicamp - Artigos e Outros Documentos

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