Dilatonic states near holographic phase transitions

Elander, Daniel; Piai, Maurizio; Roughley, John

doi:10.1103/physrevd.103.106018

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Dilatonic states near holographic phase transitions

Daniel Elander, Maurizio Piai

, John Roughley

Physical Review D, Volume: 103, Issue: 10

Swansea University Authors: Maurizio Piai , John Roughley

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DOI (Published version): 10.1103/physrevd.103.106018

Abstract

The spectrum of bound states of special strongly coupled confining field theories might include a parametrically light dilaton, associated with the formation of enhanced condensates that break (approximate) scale invariance spontaneously. It has been suggested in the literature that such a state may...

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Published in:	Physical Review D
ISSN:	2470-0010 2470-0029
Published:	American Physical Society (APS) 2021
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URI:	https://cronfa.swan.ac.uk/Record/cronfa56613
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first_indexed	2021-04-27T09:19:44Z
last_indexed	2023-01-11T14:35:56Z
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spelling	2022-10-25T13:58:50.7793803 v2 56613 2021-04-01 Dilatonic states near holographic phase transitions 3ce295f2c7cc318bac7da18f9989d8c3 0000-0002-2251-0111 Maurizio Piai Maurizio Piai true false a455f6e7908ee14413cb31e9f6f2f0fb John Roughley John Roughley true false 2021-04-01 SPH The spectrum of bound states of special strongly coupled confining field theories might include a parametrically light dilaton, associated with the formation of enhanced condensates that break (approximate) scale invariance spontaneously. It has been suggested in the literature that such a state may arise in connection with the theory being close to the unitarity bound in holographic models. We extend these ideas to cases where the background geometry is non-AdS, and the gravity description of the dual confining field theory has a top-down origin in supergravity.We exemplify this programme by studying the circle compactification of Romans six-dimensional half-maximal supergravity. We uncover a rich space of solutions, many of which were previously unknown in the literature. We compute the bosonic spectrum of excitations, and identify a tachyonic instability in a region of parameter space for a class of regular background solutions. A tachyon only exists along an energetically disfavoured (unphysical) branch of solutions of the gravity theory; we find evidence of a first-order phase transition that separates this region of parameter space from the physical one. Along the physical branch of regular solutions, one of the lightest scalar particles is approximately a dilaton, and it is associated with a condensate in the underlying theory. Yet, because of the location of the phase transition, its mass is not parametrically small, and it is, coincidentally, the next-to-lightest scalar bound state, rather than the lightest one. Journal Article Physical Review D 103 10 American Physical Society (APS) 2470-0010 2470-0029 18 5 2021 2021-05-18 10.1103/physrevd.103.106018 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2022-10-25T13:58:50.7793803 2021-04-01T12:50:33.9460580 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Daniel Elander 1 Maurizio Piai 0000-0002-2251-0111 2 John Roughley 3 56613__19929__1d5fcad7624a47d5af4f8265bfc4921a.pdf PhysRevD.103.106018.pdf 2021-05-18T16:23:30.5028296 Output 5028936 application/pdf Version of Record true Released under the terms of the Creative Commons Attribution 4.0 International license true eng https://creativecommons.org/licenses/by/4.0/
title	Dilatonic states near holographic phase transitions
spellingShingle	Dilatonic states near holographic phase transitions Maurizio Piai John Roughley
title_short	Dilatonic states near holographic phase transitions
title_full	Dilatonic states near holographic phase transitions
title_fullStr	Dilatonic states near holographic phase transitions
title_full_unstemmed	Dilatonic states near holographic phase transitions
title_sort	Dilatonic states near holographic phase transitions
author_id_str_mv	3ce295f2c7cc318bac7da18f9989d8c3 a455f6e7908ee14413cb31e9f6f2f0fb
author_id_fullname_str_mv	3ce295f2c7cc318bac7da18f9989d8c3_*_Maurizio Piai a455f6e7908ee14413cb31e9f6f2f0fb_*_John Roughley
author	Maurizio Piai John Roughley
author2	Daniel Elander Maurizio Piai John Roughley
format	Journal article
container_title	Physical Review D
container_volume	103
container_issue	10
publishDate	2021
institution	Swansea University
issn	2470-0010 2470-0029
doi_str_mv	10.1103/physrevd.103.106018
publisher	American Physical Society (APS)
college_str	Faculty of Science and Engineering
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hierarchy_top_title	Faculty of Science and Engineering
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hierarchy_parent_title	Faculty of Science and Engineering
department_str	School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
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description	The spectrum of bound states of special strongly coupled confining field theories might include a parametrically light dilaton, associated with the formation of enhanced condensates that break (approximate) scale invariance spontaneously. It has been suggested in the literature that such a state may arise in connection with the theory being close to the unitarity bound in holographic models. We extend these ideas to cases where the background geometry is non-AdS, and the gravity description of the dual confining field theory has a top-down origin in supergravity.We exemplify this programme by studying the circle compactification of Romans six-dimensional half-maximal supergravity. We uncover a rich space of solutions, many of which were previously unknown in the literature. We compute the bosonic spectrum of excitations, and identify a tachyonic instability in a region of parameter space for a class of regular background solutions. A tachyon only exists along an energetically disfavoured (unphysical) branch of solutions of the gravity theory; we find evidence of a first-order phase transition that separates this region of parameter space from the physical one. Along the physical branch of regular solutions, one of the lightest scalar particles is approximately a dilaton, and it is associated with a condensate in the underlying theory. Yet, because of the location of the phase transition, its mass is not parametrically small, and it is, coincidentally, the next-to-lightest scalar bound state, rather than the lightest one.
published_date	2021-05-18T04:11:41Z
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Dilatonic states near holographic phase transitions

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