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High Energy Physics - Phenomenology

arXiv:hep-ph/9807335 (hep-ph)
[Submitted on 10 Jul 1998]

Title:Axion potential, topological defects and CP-odd bubbles in QCD

Authors:Igor Halperin, Ariel Zhitnitsky (Univ. of British Columbia)
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Abstract: It follows on general grounds that the theta dependence in QCD is more complicated than suggested by the large N_c approach or instanton arguments. Generically, the vacuum energy E_{vac}(\theta) is a multi-valued function of \theta admitting the existence of metastable states. We discuss decays of such metastable vacua in the theory with and without the axion, and point out the potential relevance of this and related phenomena for constraining a dark matter axion. Based on the analysis of the axion potential, an idea for a new axion search experiment at RHIC is suggested. It is noted that the false vacuum decay proceeds with maximal violation of CP, even if \theta = 0. We further speculate that the famous Sakharov criteria for baryogenesis could be satisfied at the QCD scale.
Comments: Latex, 16 pages, no figures
Subjects: High Energy Physics - Phenomenology (hep-ph); Astrophysics (astro-ph)
Cite as: arXiv:hep-ph/9807335
  (or arXiv:hep-ph/9807335v1 for this version)
  https://doi.org/10.48550/arXiv.hep-ph/9807335
Journal reference: Phys.Lett.B440:77-88,1998
Related DOI: https://doi.org/10.1016/S0370-2693%2898%2901085-5

Submission history

From: Igor Halperin [view email]
[v1] Fri, 10 Jul 1998 22:10:57 UTC (20 KB)
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