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Title:
Holographic theories at finite θ\theta-angle, glueball spectra and instanton condensation
Speaker:
Abstract:
In this talk I will discuss a general class of holographic Yang-Mills-like theories at finite theta-angle, described by 5D Einstein-axion-dilaton theories, in which the instanton density operator is dual to the bulk axion field. A non-trivial UV value for the theta-angle induces a running of the axion in the bulk, which backreacts on the geometry. I will discuss the general features of these solutions, and in particular how the axion bacreaction affects the spectrum of excitations and the perturbative stability. I will comment on the possibility of describing instanton condensation in this context.
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