Probing the Electroweak Sphaleron with Gravitational Waves
  We present the relation between the sphaleron energy and the gravitational
wave signals from a first order electroweak phase transition. The crucial
ingredient is the scaling law between the sphaleron energy at the temperature
of the phase transition and that at zero temperature. We estimate the baryon
number preservation criterion, and observe that for a sufficiently strong phase
transition, it is possible to probe the electroweak sphaleron using
measurements of future space-based gravitational wave detectors.
