Theoretical High Energy Seminar – Niels Bohr Institute - University of Copenhagen

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Theoretical High Energy Seminar

Daniel Elander (Swansea)

Title: A light scalar from walking solutions in gauge-string duality
Abstract: Recently, a class of solutions to the Type IIB system of Nc D5-branes wrapped on S2 were found that exhibit walking behaviour, i.e. a suitably defined gauge coupling stays approximately constant over a large intermediate energy regime. These models provide interesting laboratories in which dynamical questions about the strongly coupled properties of walking theories can be addressed. One such question is whether the spontaneous breaking of scale invariance leads to the existence of a light scalar in the spectrum, the dilaton. In this talk, I will review results from an analytical and numerical study, which indicates the presence of such a light state, the mass of which is suppressed by the length of the walking region.