Abstract
A homogeneous and isotropic cosmological model of the universe is studied in which the parameter gamma of the “gamma-law” equation of statep=(γ−1)ρ varies continuously with cosmological time. A unified description of the early evolution of the universe is given in which an inflationary period is followed by a radiation dominated phase. Comparing the dynamics of the model with those models endowed with matter creation or vacuum energy decay, allows us to establish the time dependence of the creation rate and of the cosmological constant in terms of the varying γ index.
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Carvalho, J. C., Lima, J. A. S., and Waga, I. (1992).Physical Review D,46, 2404.
Chen, W., and Wu, Y. S. (1990).Physical Review D,41, 695.
Guth, A. H. (1981).Physical Review D,23, 347.
Israelit, M., and Rosen, N. (1989).Astrophysical Journal,342, 627.
Israelit, M., and Rosen, N. (1993).Astrophysics and Space Science,204, 317.
Lima, J. A. S., and Maia, J. M. F. (1993).Modern Physics Letters A,8, 591.
Lima, J. A. S., and Maia, J. M. F. (1994).Physical Review D,49, 5597.
Lima, J. A. S., and Trodden, M. (1995). Preprint, Brown-HET-994.
Lima, J. A. S., Germano, A. S. M., and Abramo, L. R. W. (1995). Preprint, Brown-HET-991.
Prigogine, I., Geheniau, J., Gunzig, E., and Nardone, P. (1989).General Relativity and Gravitation,21, 767.
Weinberg, S. (1972).Gravitation and Cosmology, Wiley, New York.
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Carvalho, J.C. Unified description of the early universe. Int J Theor Phys 35, 2019–2028 (1996). https://doi.org/10.1007/BF02302426
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DOI: https://doi.org/10.1007/BF02302426