Gravitational Waves from Preheating with Modified Gravitational-wave
  Propagation
  We investigate how the production of gravitational waves (GWs) is affected by
the GW velocity $(c_T)$ during preheating after inflation. For instance, we
simulate the production of GWs after $\lambda\phi^4$ chaotic inflation, and
find that GW spectrum is enhanced for $c_T<1$, but distorted (suppressed at low
frequency, but enhanced at high frequency) for $c_T>1$.
