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Light dilaton from top-down holographic confinement with magnetic fluxes
Maurizio Piai 
,
James Rucinski
,
James Rucinski
Phys Rev D
Swansea University Authors:
Maurizio Piai , James Rucinski
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Abstract
A two-parameter class of higher-dimensional, strongly coupled, confining field theories in thepresence of magnetic fluxes for two Abelian gauge groups admits a top-down, holographic dualdescription. The corresponding two-parameter family of regular background solutions of the classicalequations of m...
| Published in: | Phys Rev D |
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| Published: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa72050 |
| Abstract: |
A two-parameter class of higher-dimensional, strongly coupled, confining field theories in thepresence of magnetic fluxes for two Abelian gauge groups admits a top-down, holographic dualdescription. The corresponding two-parameter family of regular background solutions of the classicalequations of maximal supergravity in seven dimensions descends from maximal supergravity ineleven dimensions. We study the global and local stability properties of these solutions. We identifylines of zero-temperature first-order phase transitions, describing a polygon (a square) in the spaceof parameters, identified with the two fluxes. The transition separates the family of gravity solutionsdual to confining theories, inside the polygon, from those outside, in which the field theory is realisedin a conformal phase. In the spectrum of fluctuations of the supergravity equations, interpreted asbound states of the dual, confining field theories, we find no evidence of local instabilities (tachyons).Over a significant portion of parameter space, that extends far away from the proximity to thetransition, we identify an approximate dilaton, the mass of which is one order of magnitude smallerthan the scale set by confinement. Our findings complement those emerging in other holographicmodels discussed in the literature, in which either the dilaton mass is only mildly lower than theconfinement scale (when approaching a first-order transitions), or parametrically suppressed (whenreaching the proximity to a second-order one). |
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| College: |
Faculty of Science and Engineering |