Cosmological properties of a class of Lambda decaying cosmologies - INSPIRE

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Cosmological properties of a class of Lambda decaying cosmologies

V. Silveira
(
- Brasilia U. and
- Fermilab
)
,
I. Waga
(
- Rio de Janeiro Federal U. and
- Fermilab
)

Mar, 1997

7 pages

Published in:

Phys.Rev.D 56 (1997) 4625-4632

e-Print:

astro-ph/9703185 [astro-ph]

DOI:

10.1103/PhysRevD.56.4625

View in:

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Abstract: (arXiv)

We investigate some properties of flat cosmological models with a

\Lambda

term that decreases with time as

\Lambda \propto a^{-m}

(a is the scale factor and m is a parameter

0\leq m < 3

). The models are equivalent to standard cosmology with matter and radiation plus an exotic fluid with the equation of state

p_x = (m/3 -1)\rho_x

. We study the effect of the decaying

\Lambda

term on the cosmic microwave background (CMB) anisotropy and by using a seminumeric method we compute the angular power spectrum (up to l=20) for different values of m and

\Omega_{m0}

. We also investigate the constraints imposed on the models by the magnitude-redshift test in which high-redshift type Ia supernovae (SNe Ia) are used as standard candles. We obtain the 95.4%, 90%, and 68% confidence levels on the parameters m and

\Omega_{m0}

and compare them with those arising from lensing statistics. Our analysis reveals that the SNe Ia constraints are stronger for low values of m and

\Omega_{m0}

, while those from lensing statistics are more important for

m > \sim 1

. Models with

\Omega_{m0} > \sim 0.2

and

m > \sim 1.6

are in good agreement with the data.

98.80.Hw

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