Cosmology with ultralight pseudo Nambu-Goldstone bosons

Journal Article · Mon Sep 11 00:00:00 EDT 1995 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.75.2077· OSTI ID:239416

Frieman, J A; Hill, C T; Stebbins, A; Waga, I ^[1]

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1. NASA/Fermilab Astrophysics Center, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States)

We explore the cosmological implications of an ultralight pseudo Nambu-Goldstone boson. With global spontaneous symmetry breaking scale {ital f}{congruent}10{sup 18} GeV and explicit breaking scale comparable to Mikheyev-Smirnov-Wolfenstein neutrino masses, {ital M}{similar_to}10{sup {minus}3}eV, such a field, which acquires a mass {ital m}{sub {phi}}{similar_to}{ital M}{sup 2}/{ital f}{similar_to}{ital H}{sub 0}, 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, {Omega}{sub {ital m}}{similar_to}0.2, with a spatially flat universe, yielding {ital H}{sub 0}{ital t}{sub 0}{congruent}1 consistent with limits from gravitational lens statistics.

• OSTI ID: 239416
• Journal Information: Physical Review Letters, Vol. 75, Issue 11; Other Information: PBD: 11 Sep 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COSMOLOGY
GOLDSTONE BOSONS
COSMOLOGICAL CONSTANT
ENERGY DENSITY
MASS
NEUTRINOS
SYMMETRY BREAKING
UNIVERSE