Hyperscaling violation and electroweak symmetry breaking
We consider a class of simplified models of dynamical electroweak symmetry breaking built in terms of their fivedimensional weaklycoupled gravity duals, in the spirit of bottomup holography. The sigmamodel consists of two abelian gauge bosons and one real, noncharged 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 sigmamodel 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 spin1 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 spin1 resonance, by requiring that the indirect bounds on the precision parameters be satisfied, that implies that precision electroweak physics excludes the possibility of a technirho mesonmore »
 Authors:

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^{[2]};
^{[2]}
 Purdue Univ., West Lafayette, IN (United States). Dept. of Physics
 Swansea Univ., Wales (United Kingdom). Dept. of Physics
 Publication Date:
 Grant/Contract Number:
 SC0007884; PHY0952630; ST/L000369/1; ST/I506037/1
 Type:
 Published Article
 Journal Name:
 Nuclear Physics. B
 Additional Journal Information:
 Journal Volume: 897; Journal ID: ISSN 05503213
 Publisher:
 Elsevier
 Research Org:
 Purdue Univ., West Lafayette, IN (United States); Swansea Univ., Wales (United Kingdom)
 Sponsoring Org:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25); National Science Foundation (NSF); Science and Technology Facilities Council (STFC) (United Kingdom)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
 OSTI Identifier:
 1198558
 Alternate Identifier(s):
 OSTI ID: 1454530
Elander, Daniel, Lawrance, Robert, and Piai, Maurizio. Hyperscaling violation and electroweak symmetry breaking. United States: N. p.,
Web. doi:10.1016/j.nuclphysb.2015.06.004.
Elander, Daniel, Lawrance, Robert, & Piai, Maurizio. Hyperscaling violation and electroweak symmetry breaking. United States. doi:10.1016/j.nuclphysb.2015.06.004.
Elander, Daniel, Lawrance, Robert, and Piai, Maurizio. 2015.
"Hyperscaling violation and electroweak symmetry breaking". United States.
doi:10.1016/j.nuclphysb.2015.06.004.
@article{osti_1198558,
title = {Hyperscaling violation and electroweak symmetry breaking},
author = {Elander, Daniel and Lawrance, Robert and Piai, Maurizio},
abstractNote = {We consider a class of simplified models of dynamical electroweak symmetry breaking built in terms of their fivedimensional weaklycoupled gravity duals, in the spirit of bottomup holography. The sigmamodel consists of two abelian gauge bosons and one real, noncharged 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 sigmamodel 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 spin1 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 spin1 resonance, by requiring that the indirect bounds on the precision parameters be satisfied, that implies that precision electroweak physics excludes the possibility of a technirho meson with mass lighter than several TeV.},
doi = {10.1016/j.nuclphysb.2015.06.004},
journal = {Nuclear Physics. B},
number = ,
volume = 897,
place = {United States},
year = {2015},
month = {6}
}