Cosmology with Ultralight Pseudo Nambu-Goldstone Bosons

Joshua A. Frieman, Christopher T. Hill, Albert Stebbins, and Ioav Waga
Phys. Rev. Lett. 75, 2077 – Published 11 September 1995
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Abstract

We explore the cosmological implications of an ultralight pseudo Nambu-Goldstone boson. With global spontaneous symmetry breaking scale f1018GeV and explicit breaking scale comparable to Mikheyev-Smirnov-Wolfenstein neutrino masses, M103eV, such a field, which acquires a mass mφM2/fH0, would currently dominate the energy density of the Universe. The field acts as an effective cosmological constant before relaxing into a condensate of nonrelativistic bosons. Such a model can reconcile dynamical estimates of the density parameter, Ωm0.2, with a spatially flat universe, yielding H0t01 consistent with limits from gravitational lens statistics.

  • Received 17 May 1995

DOI:https://doi.org/10.1103/PhysRevLett.75.2077

©1995 American Physical Society

Authors & Affiliations

Joshua A. Frieman1,2, Christopher T. Hill3, Albert Stebbins1, and Ioav Waga1,4

  • 1NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510
  • 2Department of Astronomy and Astrophysics, University of Chicago, Chicago, Illinois 60637
  • 3Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510
  • 4Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, 21943, Brazil

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Vol. 75, Iss. 11 — 11 September 1995

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