On the glueball spectrum of walking backgrounds from wrapped-D5 gravity duals |
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Authors: | Daniel Elander Maurizio Piai |
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Institution: | 1. Department of Theoretical Physics, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India;2. Department of Physics, College of Science, Swansea University, Singleton Park, Swansea, Wales, UK |
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Abstract: | We compute the mass spectrum of glueball excitations of a special class of strongly-coupled field theories via their Type-IIB supergravity dual. We focus on two subclasses of backgrounds, which have different UV-asymptotics, but both of which exhibit walking behavior, in the weak sense that the gauge coupling of the dual field theory exhibits a quasi-constant behavior at strong coupling over a range of energies, before diverging in the deep IR. We improve on earlier calculations, by making use of the fully rigorous treatment of the 5-dimensional consistent truncation, including the rigorous form of the boundary conditions. In both cases there is a parametrically light scalar glueball. In the first case, this is a physical state, while in the second case this result is unphysical, since the presence of higher-order operators in the dual field theory makes the whole (physical) spectrum depend explicitly on a (unphysical) UV cutoff scale. |
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