New constraints from high redshift supernovae and lensing statistics upon scalar field cosmologies

Journal Article · Tue Aug 15 04:00:00 EDT 2000 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.62.043521· OSTI ID:20217387

Waga, Ioav ^[1]; Frieman, Joshua A ^[2]

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1. Universidade Federal do Rio de Janeiro, Instituto de Fisica, Rio de Janeiro, RJ, 21945-970, (Brazil)
2. NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510 (United States)

We explore the implications of gravitationally lensed quasistellar objects and high-redshift SNe Ia observations for spatially flat cosmological models in which a classically evolving scalar field currently dominates the energy density of the Universe. We consider two representative scalar field potentials that give rise to effective decaying {lambda} (''quintessence'') models: pseudo Nambu-Goldstone bosons [V({phi})=M{sup 4}(1+cos({phi}/f))] and an inverse power-law potential [V({phi})=M{sup 4+{alpha}}{phi}{sup -{alpha}}]. We show that a large region of parameter space is consistent with current data if {omega}{sub m0}>0.15. On the other hand, a higher lower bound for the matter density parameter suggested by large-scale galaxy flows, {omega}{sub m0}>0.3, considerably reduces the allowed parameter space, forcing the scalar field behavior to approach that of a cosmological constant. (c) 2000 The American Physical Society.

• OSTI ID: 20217387
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 4 Vol. 62; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMOLOGICAL CONSTANT
COSMOLOGICAL MODELS
GRAVITATIONAL LENSES
QUASARS
RED SHIFT
SUPERNOVAE
THEORETICAL DATA