Speaker
Description
In the magnetized phase of the phi^4 theory interfaces can form between two magnetization domains each in a different spontaneously broken vacuum. When we impose anti-periodic boundary conditions in one of the directions an interface necessarily forms somewhere in the bulk.
We compute the free energy associated to these interfaces with the Jarzynski equality. And study its behavior changing the geometry of the lattice and the coupling of the theory, testing an Effective String Theory model.
Particularly interesting is the region in the phase diagram of the theory where the attraction to the Gaussian fixed point allows the string tension to be small with respect to the mass of the bulk particle. This leads to a different phenomenology in the effective string theory that we analyze.