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Title: A holographic perspective on the axion quality problem

Journal Article · · Journal of High Energy Physics (Online)
ORCiD logo [1];  [2];  [2]
  1. Univ. of Melbourne (Australia). School of Physics; Univ. of Tokyo (Japan). Kavli Institute for the Physics and Mathematics of the Universe (WPI); OSTI
  2. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy

The axion provides a compelling solution to the strong CP problem as well as a candidate for the dark matter of the universe. However, the axion solution relies on the spontaneous breaking of a global U(1)P Q symmetry, which is also explicitly violated by quantum gravity. To preserve the axion solution, gravitational violations of the U(1)P Q symmetry must be suppressed to sufficiently high order. We present a simple, geometric solution of the axion quality problem by modelling the axion with a bulk complex scalar field in a slice of AdS5, where the U(1)P Q symmetry is spontaneously broken in the bulk but explicitly broken on the UV brane. By localising the axion field towards the IR brane, gravitational violations of the PQ symmetry on the UV brane are sufficiently sequestered. This geometric solution is holographically dual to 4D strong dynamics where the global U(1)P Q is an accidental symmetry to sufficiently high order.

Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0011842
OSTI ID:
1802268
Journal Information:
Journal of High Energy Physics (Online), Journal Name: Journal of High Energy Physics (Online) Journal Issue: 1 Vol. 2020; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English

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