Decaying vacuum energy and deflationary cosmology in open and closed universes

Lima, J.A.S.; Trodden, M.

doi:10.1103/PhysRevD.53.4280

Decaying vacuum energy and deflationary cosmology in open and closed universes

J.A.S. Lima
(
- Brown U. and
- Rio Grande do Norte U.
)
,
M. Trodden
(
- Brown U.
)

Aug, 1995

21 pages

Published in:

Phys.Rev.D 53 (1996) 4280-4286

e-Print:

astro-ph/9508049 [astro-ph]

DOI:

10.1103/PhysRevD.53.4280

Report number:

BROWN-HET-994

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Abstract: (arXiv)

We consider a nonsingular deflationary cosmological model with decaying vacuum energy density in universes of arbitrary spatial curvature. Irrespective of the value of

k

, the models are characterized by an arbitrary time scale

H_I~{-1}

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

H_I~{-1}

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_I/\Lambda_0 \simeq 10~{118}

as theoretically suggested. It is also shown that all models allow a density parameter \Omega_0 <2/3 and that the age of the universe is large enough to agree with observations even with the high value of

H_0

suggested by recent measurements.

04.50.+h
98.80.Cq
cosmological model
energy: density
vacuum state: decay
decay: vacuum state
space-time: Robertson-Walker
matter: density
numerical calculations

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