Decaying vacuum energy and deflationary cosmology in open and closed universes

Journal Article · Mon Apr 01 04:00:00 EST 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.53.4280· OSTI ID:279952

Lima, J A ^[1]; Trodden, M ^[1]

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1. Physics Department, Brown University, Providence, Rhode Island 02912 (United States)

We consider a nonsingular deflationary cosmological model with a decaying vacuum energy density in universes of arbitrary spatial curvature. Irrespective of the value of {ital k}, the models are characterized by an arbitrary time scale {ital H}{sup {minus}1}{sub {ital I}} which determines the initial temperature of the universe and the largest value of the vacuum energy density, the slow decay of which generates all the presently observed matter energy of the Universe. If {ital H}{sup {minus}1}{sub {ital I}} is of the order of the Planck time, the models begin with the Planck temperature and the present day value of the cosmological constant satisfies {Lambda}{sub {ital I}}/{Lambda}{sub 0}{approx_equal}10{sup 118} as theoretically suggested. It is also shown that all models allow a density parameter {Omega}{sub 0}{lt}2/3 and that the age of the Universe is large enough to agree with observations even with the high value of {ital H}{sub 0} suggested by recent measurements. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Brown University
• DOE Contract Number: FG02-91ER40688
• OSTI ID: 279952
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 8 Vol. 53; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CLOSED-CYCLE SYSTEMS
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
DECAY
ENERGY DENSITY
OPEN-CYCLE SYSTEMS
UNIVERSE
VACUUM STATES