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Title: Windows on the axion

Peccei-Quinn symmetry with attendant axion is a most compelling, and perhaps the most minimal, extension of the standard model, as it provides a very elegant solution to the nagging strong CP-problem associated with the THETA vacuum structure of QCD. However, particle physics gives little guidance as to the axion mass; a priori, the plausible values span the range: 10/sup /minus/12/ eV /approx lt/ m/sub a/ /approx lt/ 10/sup 6/ eV, some 18 orders-of-magnitude. Axions have a host of interesting astrophysical and cosmological effects, including, modifying the evolution of stars of all types (our sun, red giants, white dwarfs, and neutron stars), contributing significantly to the mass density of the Universe today, and producing detectable line radiation through the decays of relic axions. Consideration of these effects has probed 14 orders-of-magnitude in axion mass, and has left open only two windows for further exploration: 10/sup /minus/6/ eV /approx lt/ m/sub a/ /approx lt/ 10/sup /minus/3/ eV and 1 eV /approx lt/ m/sub a/ /approx lt/ 5 eV (hadronic axions only). Both these windows are accessible to experiment, and a variety of very interesting experiments, all of which involve ''heavenly axions,'' are being planned or are underway. 58 refs., 6 figs., 1more » tab.« less
Authors:
Publication Date:
OSTI Identifier:
6060590
Report Number(s):
FNAL/C-89/104-A; CONF-8904224-1
ON: DE89013151
DOE Contract Number:
AC02-76CH03000
Resource Type:
Conference
Resource Relation:
Conference: Cosmic axion workshop, Upton, NY, USA, 13 Apr 1989; Other Information: Portions of this document are illegible in microfiche products
Research Org:
Fermi National Accelerator Lab., Batavia, IL (USA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANIONS; QUANTUM CHROMODYNAMICS; COSMOLOGY; CP INVARIANCE; LAGRANGIAN FUNCTION; NEUTRINOS; NEUTRON STARS; QUARKONIUM; REST MASS; STANDARD MODEL; STARS; SUPERNOVAE; SYMMETRY BREAKING; CHARGED PARTICLES; ELEMENTARY PARTICLES; ERUPTIVE VARIABLE STARS; FERMIONS; FIELD THEORIES; FUNCTIONS; INVARIANCE PRINCIPLES; IONS; LEPTONS; MASS; MASSLESS PARTICLES; MATHEMATICAL MODELS; PARTICLE MODELS; QUANTUM FIELD THEORY; UNIFIED GAUGE MODELS; VARIABLE STARS 645200* -- High Energy Physics-- Particle Interactions & Properties-Theoretical; 645400 -- High Energy Physics-- Field Theory; 640106 -- Astrophysics & Cosmology-- Cosmology