Cosmological constraints from lensing statistics and supernovae on the cosmic equation of state

Details Cosmological constraints from lensing statistics and supernovae on the cosmic equation of state Cosmological constraints from lensing statistics and supernovae on the cosmic equation of state

1998-11-30

arxiv.org/abs/astro-ph/9811460v1

Phys.Rev.D59:103507,1999

Astronomy and Astrophysics

Astrophysics

7 pages, 4 postscript figures, revtex, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.59.103507

We investigate observational constraints from lensing statistics and high-z type Ia supernovae on flat cosmological models with nonrelativistic matter and an exotic fluid with equation of state, $p_x=(m/3 -1)\rho_x$. We show that agreement with both tests at the 68% confidence level is possible if the parameter $m$ is low ($m \lesssim 0.85$) and $0.24 \lesssim \Omega_{m0} \lesssim 0.38$ with lower values of $\Omega_{m0}$ corresponding to higher $m$. We find that a conventional cosmological constant model with $\Omega_{m0}\simeq 0.33$ is the best fit model of the combined likelihood.

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