Gaussian Model A quench
= Gaussian Model A quench
After a sudden change from quadratic kernel $K_I(q)$ to $K_F(q)$, each Fourier mode is an <Ornstein-Uhlenbeck process> with decay rate $r(q)=\Gamma K_F(q)$. Its equal-time covariance interpolates exponentially between $k_BT/K_I(q)$ and $k_BT/K_F(q)$.