A holographic perspective on the axion quality problem

A bstract 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) PQ symmetry, which is also explicitly violated by quantum gravity. To preserve the a...

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Published in:The journal of high energy physics Vol. 2020; no. 1; pp. 188 - 20
Main Authors: Cox, Peter, Gherghetta, Tony, Nguyen, Minh D.
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 29.01.2020
Springer Nature B.V
Springer Berlin
SpringerOpen
Subjects:
Beyond Standard Model
Boundary conditions
Branes
Classical and Quantum Gravitation
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Dark matter
Elementary Particles
Field Theories in Higher Dimensions
Global Symmetries
Gravity
High energy physics
Hypothetical particles
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum gravity
Quantum Physics
Quarks
Regular Article - Theoretical Physics
Relativity Theory
Scalars
String Theory
Symmetry
Universe
Violations
Global Symmetries
Beyond Standard Model
Field Theories in Higher Dimensions
ISSN:1029-8479, 1029-8479
Online Access:Get full text
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Summary:A bstract 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) PQ symmetry, which is also explicitly violated by quantum gravity. To preserve the axion solution, gravitational violations of the U(1) PQ 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 AdS 5 , where the U(1) PQ 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) PQ is an accidental symmetry to sufficiently high order.
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content type line 14
USDOE Office of Science (SC)
SC0011842
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP01(2020)188