Description
I will report results of lattice simulations for cosmic domain walls. The main focus will be on the spectra of gravitational waves produced by these topological defects. There are various types of spectra to be discussed, which originate from different types of domain walls: long-living domain walls, annihilating ones, as well as melting walls characterized by a time-dependent tension. On the theoretical side, I will focus on the scaling of domain walls, i.e., the fact that they evolve in a self-similar manner, and their curvature radius remains of the order of the horizon size. This property is likely to be related to the intense particle emission by domain walls, and I will discuss the possible mechanism underlying such emission.