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|Type:||Artigo de periódico|
|Title:||THERMODYNAMIC PROPERTIES OF GAMMA-FLUIDS AND THE QUANTUM VACUUM|
|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.|
|Editor:||American Physical Soc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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