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Hyperscaling violation and electroweak symmetry breaking

Daniel Elander, Robert Lawrance, Maurizio Piai Orcid Logo

Nuclear Physics B, Volume: 897, Pages: 583 - 611

Swansea University Author: Maurizio Piai Orcid Logo

DOI (Published version): 10.1016/j.nuclphysb.2015.06.004

Abstract

We consider a class of simplified models of dynamical electroweak symmetry breaking built in terms of their five-dimensional weakly-coupled gravity duals, in the spirit of bottom-up holography. The sigma-model consists of two abelian gauge bosons and one real, non-charged scalar field coupled to gra...

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Published in: Nuclear Physics B
Published: 2015
Online Access: http://arxiv.org/abs/1504.07949
URI: https://cronfa.swan.ac.uk/Record/cronfa20997
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first_indexed 2015-05-01T02:08:58Z
last_indexed 2018-11-05T13:29:52Z
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spelling 2018-11-05T09:10:00.5570143 v2 20997 2015-04-30 Hyperscaling violation and electroweak symmetry breaking 3ce295f2c7cc318bac7da18f9989d8c3 0000-0002-2251-0111 Maurizio Piai Maurizio Piai true false 2015-04-30 SPH We consider a class of simplified models of dynamical electroweak symmetry breaking built in terms of their five-dimensional weakly-coupled gravity duals, in the spirit of bottom-up holography. The sigma-model consists of two abelian gauge bosons and one real, non-charged scalar field coupled to gravity in five dimensions. The scalar potential is a simple exponential function of the scalar field. The background metric resulting from solving the classical equations of motion exhibits hyperscaling violation, at least at asymptotically large values of the radial direction. We study the spectrum of scalar composite states of the putative dual field theory by fluctuating the sigma-model scalars and gravity, and discuss in which cases we find a parametrically light scalar state in the spectrum. We model the spontaneous breaking of the (weakly coupled) gauge symmetry to the diagonal subgroup by the choice of IR boundary conditions. We compute the mass spectrum of spin-1 states, and the precision electroweak parameter S as a function of the hyperscaling coefficient. We find a general bound on the mass of the lightest spin-1 resonance, by requiring that the indirect bounds on the precision parameters be satisfied, that implies that precision electroweak physics excludes the possibility of a techni-rho meson with mass lighter than several TeV. Journal Article Nuclear Physics B 897 583 611 31 12 2015 2015-12-31 10.1016/j.nuclphysb.2015.06.004 http://arxiv.org/abs/1504.07949 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2018-11-05T09:10:00.5570143 2015-04-30T09:08:22.5597727 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Daniel Elander 1 Robert Lawrance 2 Maurizio Piai 0000-0002-2251-0111 3 0020997-18062015074923.pdf 1504.07949v2.pdf 2015-06-18T07:49:23.8700000 Output 414831 application/pdf Accepted Manuscript true 2015-06-18T00:00:00.0000000 false
title Hyperscaling violation and electroweak symmetry breaking
spellingShingle Hyperscaling violation and electroweak symmetry breaking
Maurizio Piai
title_short Hyperscaling violation and electroweak symmetry breaking
title_full Hyperscaling violation and electroweak symmetry breaking
title_fullStr Hyperscaling violation and electroweak symmetry breaking
title_full_unstemmed Hyperscaling violation and electroweak symmetry breaking
title_sort Hyperscaling violation and electroweak symmetry breaking
author_id_str_mv 3ce295f2c7cc318bac7da18f9989d8c3
author_id_fullname_str_mv 3ce295f2c7cc318bac7da18f9989d8c3_***_Maurizio Piai
author Maurizio Piai
author2 Daniel Elander
Robert Lawrance
Maurizio Piai
format Journal article
container_title Nuclear Physics B
container_volume 897
container_start_page 583
publishDate 2015
institution Swansea University
doi_str_mv 10.1016/j.nuclphysb.2015.06.004
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
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
url http://arxiv.org/abs/1504.07949
document_store_str 1
active_str 0
description We consider a class of simplified models of dynamical electroweak symmetry breaking built in terms of their five-dimensional weakly-coupled gravity duals, in the spirit of bottom-up holography. The sigma-model consists of two abelian gauge bosons and one real, non-charged scalar field coupled to gravity in five dimensions. The scalar potential is a simple exponential function of the scalar field. The background metric resulting from solving the classical equations of motion exhibits hyperscaling violation, at least at asymptotically large values of the radial direction. We study the spectrum of scalar composite states of the putative dual field theory by fluctuating the sigma-model scalars and gravity, and discuss in which cases we find a parametrically light scalar state in the spectrum. We model the spontaneous breaking of the (weakly coupled) gauge symmetry to the diagonal subgroup by the choice of IR boundary conditions. We compute the mass spectrum of spin-1 states, and the precision electroweak parameter S as a function of the hyperscaling coefficient. We find a general bound on the mass of the lightest spin-1 resonance, by requiring that the indirect bounds on the precision parameters be satisfied, that implies that precision electroweak physics excludes the possibility of a techni-rho meson with mass lighter than several TeV.
published_date 2015-12-31T03:24:51Z
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score 11.0372095

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