Cosmological constraints on pseudo-Nambu-Goldstone bosons

Details Cosmological constraints on pseudo-Nambu-Goldstone bosons Cosmological constraints on pseudo-Nambu-Goldstone bosons

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9211943f&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Bosons, Broken Symmetry, Cosmology, Mathematical Models, Particle Theory, Quantum Chromodynamics, Astrophysics, Misalignment, Nuclides, Particle Production, Vacuum

Scientific paper

Particle physics models with pseudo-Nambu-Goldstone bosons (PNGBs) are characterized by two mass scales: a global spontaneous symmetry breaking scale, f, and a soft (explicit) symmetry breaking scale, Lambda. General model insensitive constraints were studied on this 2-D parameter space arising from the cosmological and astrophysical effects of PNGBs. In particular, constraints were studied arising from vacuum misalignment and thermal production of PNGBs, topological defects, and the cosmological effects of PNGB decay products, as well as astrophysical constraints from stellar PNGB emission. Bounds on the Peccei-Quinn axion scale, 1010 GeV approx. = or less than fpq approx. = or less than 1010 to 1012 GeV, emerge as a special case, where the soft breaking scale is fixed at LambdaQCD approx. = 100 MeV.

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