From de Sitter to de Sitter: A non-singular inflationary universe driven by vacuum

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dc.creatorCarneiro, Saulo
dc.date2006-05-26
dc.date2006-05-26
dc.date.accessioned2026-07-07T11:04:26Z
dc.date.available2026-07-07T11:04:26Z
dc.descriptionA semi-classical analysis of vacuum energy in the expanding spacetime suggests that the cosmological term decays with time, with a concomitant matter production. For early times we find, in Planck units, $Λ\approx H^4$, where H is the Hubble parameter. The corresponding cosmological solution has no initial singularity, existing since an infinite past. During an infinitely long period we have a quasi-de Sitter, inflationary universe, with $H \approx 1$. However, at a given time, the expansion undertakes a phase transition, with H and $Λ$ decreasing to nearly zero in a few Planck times, producing a huge amount of radiation. On the other hand, the late-time scenario is similar to the standard model, with the radiation phase followed by a dust era, which tends asymptotically to a de Sitter universe, with vacuum dominating again.
dc.descriptionThis essay received an "honorable mention" in the 2006 Essay Competition of the Gravity Research Foundation
dc.identifierhttps://arxiv.org/abs/gr-qc/0605133
dc.identifierhttp://arxiv.org/abs/gr-qc/0605133
dc.identifierInt.J.Mod.Phys.D15:2241-2247,2006
dc.identifierdoi:10.1142/S0218271806009510
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188893
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Theory
dc.titleFrom de Sitter to de Sitter: A non-singular inflationary universe driven by vacuum
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