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

Ioav Waga and Joshua A. Frieman
Phys. Rev. D 62, 043521 – Published 26 July 2000
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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 Λ (“quintessence”) models: pseudo Nambu-Goldstone bosons [V(φ)=M4(1+cos(φ/f))] and an inverse power-law potential [V(φ)=M4+αφα]. We show that a large region of parameter space is consistent with current data if Ωm0>0.15. On the other hand, a higher lower bound for the matter density parameter suggested by large-scale galaxy flows, Ωm0>0.3, considerably reduces the allowed parameter space, forcing the scalar field behavior to approach that of a cosmological constant.

  • Received 18 January 2000


©2000 American Physical Society

Authors & Affiliations

Ioav Waga

  • Universidade Federal do Rio de Janeiro, Instituto de Física, Rio de Janeiro, RJ, 21945-970, Brazil

Joshua A. Frieman

  • NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510
  • Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637

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Vol. 62, Iss. 4 — 15 August 2000

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