Interface tension of the electroweak phase transition

In our nonperturbative lattice investigation we study the interface tension of the finite- temperature electroweak phase transition. In this analysis the Higgs mass has been chosen to be about 35 GeV. At the transition point of a finite volume system, tunnelling between the symmetric and the Higgs phase takes place. This phenomenon leads to a splitting of the ground state, which can be used to determine the interface tension. The result obtained this way agrees with the result of the two-coupling method and with the prediction of the perturbative approach.