Superradiance in a ghost-free scalar theory

Understand

We study superradiance effect in the ghost-free theory.

• We consider a scattering of a ghost-free scalar massless field on a rotating cylinder.
• We assume that cylinder is thin and empty inside, so that its interaction with the field is described by a delta-like potential.
• This potential besides the real factor, describing its height, contains also imaginary part, responsible for the absorption of the field.