Cosmological models with dynamical Lambda in scalar tensor theories - INSPIRE

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Cosmological models with dynamical Lambda in scalar tensor theories

Jul, 1999

20 pages

Published in:

Phys.Rev.D 60 (1999) 123501

e-Print:

gr-qc/9907016 [gr-qc]

DOI:

10.1103/PhysRevD.60.123501

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Abstract: (arXiv)

In the context of a family os scalar-tensor theories with a dynamical

\Lambda

, that is a binomial on the scalar field, the cosmological equations are considered. A general barotropic state equation

p=(\gamma-1)\rho

, for a perfect fluid is used for the matter content of the Universe. Some Friedmann- Robertson-Walker exact solutions are found, they have scale factor wich shows exponential or power law dependence on time. For some models the singularity can be avoided. Cosmological parameters as

\Omega_m

,

\Omega_{\Lambda}

,

q_0

and

t_0

are obtained and compared with observational data.

gravitation: scalar
gravitation: tensor
cosmological model
cosmological constant
model: fluid
space-time: Robertson-Walker
matter: density
radiation
field equations: solution
vacuum state

References(70)

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