Speaker
Davide Bonomi
(City, University of London)
Description
A powerful way to study Conformal Field Theories analytically is the Lorentzian inversion formula, which allows to extract the CFT data of a given four-point function from its double discontinuity. One can also derive a dispersion relation that reconstructs directly the full correlator from the same double discontinuity. I will consider the generalisation of these methods to defect CFTs, discussing a recently derived dispersion relation that allows to compute the two-point functions of bulk operators in presence of a defect. I will show an application of this formalism to the O(N) model in the presence of a magnetic line defect, and to the case of a line defect representing a spin impurity.
Primary author
Davide Bonomi
(City, University of London)
