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FRW Cosmologies with Adiabatic Matter Creation | | J.A.S. Lima
; A.S.M. Germano
; L.R.W. Abramo
; | | Date: |
2 Nov 1995 | | Journal: | Phys.Rev. D53 (1996) 4287-4297 | | Subject: | gr-qc | | Affiliation: | Brown), A.S.M. Germano (UFRN) and L.R.W. Abramo (Brown | | Abstract: | Some properties of cosmological models with matter creation are investigated in the framework of the Friedman-Robertson-Walker (FRW) line element. For adiabatic matter creation, as developed by Prigogine and coworkers, we derive a simple expression relating the particle number density $n$ and energy density $
ho$ which holds regardless of the matter creation rate. The conditions to generate inflation are discussed and by considering the natural phenomenological matter creation rate $psi =3 eta nH$, where $eta$ is a pure number of the order of unity and $H$ is the Hubble parameter, a minimally modified hot big-bang model is proposed. The dynamic properties of such models can be deduced from the standard ones simply by replacing the adiabatic index $gamma$ of the equation of state by an effective parameter $gamma_{*} = gamma (1 - eta)$. The thermodynamic behavior is determined and it is also shown that ages large enough to agree with observations are obtained even given the high values of $H$ suggested by recent measurements. | | Source: | arXiv, gr-qc/9511006 | | Services: | Forum | Review | PDF | Favorites | |
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