Speaker
Description
Defect conformal field theories (DCFTs) provide a universal framework for describing the low energy interaction of heavy degrees of freedom with light excitations. In a DCFT part of the Poincaré symmetry is broken explicitly. However, the fundamental laws of our world are Poincaré invariant and any breaking of space-time symmetries must be spontaneous. In particular, extended and thin objets which spontaneously break Poincaré invariance support the propagation of Goldstone bosons on their worldvolume. Their action is invariant under a non-linear realization of the Poincaré symmetry. Since the Goldstone bosons are massless, a natural question is, how DCFTs can describe the infrared limit of real-world heavy objects embedded in a massless bulk. The work I am going to present aims to answer this question by constructing an effective field theory that describes the coupling of the Goldstone bosons to a generic DCFT.