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

Journal Article · Sat May 01 04:00:00 EDT 1999 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.59.103507· OSTI ID:337591

Waga, I ^[1]; Miceli, A P ^[1]

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1. Universidade Federal do Rio de Janeiro, Instituto de Fisica, Caixa Postal 68528, 21945-970 (Brazil)

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 an equation of state, p{sub x}=(m/3{minus}1){rho}{sub x}. We show that agreement with both tests at the 68{percent} confidence level is possible if the parameter {ital m} is low (m{approx_lt}0.85) and 0.24{approx_lt}{Omega}{sub m0}{approx_lt}0.38 with lower values of {Omega}{sub m0} corresponding to higher {ital m}. We find that a conventional cosmological constant model with {Omega}{sub m0}{approx_equal}0.33 is the best fit model of the combined likelihood. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 337591
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 10 Vol. 59; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
COSMOLOGY
EQUATIONS OF STATE
GRAVITATIONAL LENSES
SUPERNOVAE