Domain walls and gravitational waves in the Standard Model
  We study domain walls which can be created in the Standard Model under the
assumption that it is valid up to very high energy scales. We focus on domain
walls interpolating between the physical electroweak vacuum and the global
minimum appearing at very high field strengths. The creation of the network
which ends up in the electroweak vacuum percolating through the Universe is not
as difficult to obtain as one may expect, although it requires certain tuning
of initial conditions. Our numerical simulations confirm that such domain walls
would swiftly decay and thus cannot dominate the Universe. We discuss the
possibility of detection of gravitational waves produced in this scenario. We
have found that for the standard cosmology the energy density of these
gravitational waves is too small to be observed in present and planned
detectors.
