Evolution of the Scale Factor with a Variable Cosmological Term

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dc.creatorOverduin, J. M.
dc.creatorCooperstock, F. I.
dc.date1998-05-20
dc.date.accessioned2026-07-07T11:46:09Z
dc.date.available2026-07-07T11:46:09Z
dc.descriptionEvolution of the scale factor a(t) in Friedmann models (those with zero pressure and a constant cosmological term Lambda) is well understood, and elegantly summarized in the review of Felten and Isaacman [Rev. Mod. Phys. 58, 689 (1986)]. Developments in particle physics and inflationary theory, however, increasingly indicate that Lambda ought to be treated as a dynamical quantity. We revisit the evolution of the scale factor with a variable Lambda-term, and also generalize the treatment to include nonzero pressure. New solutions are obtained and evaluated using a variety of observational criteria. Existing arguments for the inevitability of a big bang (ie., an initial state with a=0) are substantially weakened, and can be evaded in some cases with Lambda_0 (the present value of Lambda) well below current experimental limits.
dc.description29 pages, 12 figures (not included), LaTeX, uses Phys Rev D style files (revtex.cls, revtex.sty, aps.sty, aps10.sty, prabib.sty). To appear in Phys Rev D
dc.identifierhttps://arxiv.org/abs/astro-ph/9805260
dc.identifierhttp://arxiv.org/abs/astro-ph/9805260
dc.identifierPhys.Rev.D58:043506,1998
dc.identifierdoi:10.1103/PhysRevD.58.043506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202125
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleEvolution of the Scale Factor with a Variable Cosmological Term
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