Hölder-continuity for the nonlinear stochastic heat equation with rough initial conditions

We study space-time regularity of the solution of the nonlinear stochastic heat equation in one spatial dimension driven by space-time white noise, with a rough initial condition. This initial condition is a locally finite measure $μ$ with, possibly, exponentially growing tails. We show how this regularity depends, in a neighborhood of $t=0$, on the regularity of the initial condition. On compact sets in which $t>0$, the classical Hölder-continuity exponents $\frac{1}{4}-$ in time and $\frac{1}{2}-$ in space remain valid. However, on compact sets that include $t=0$, the Hölder continuity of the solution is $\left(\fracα{2}\wedge \frac{1}{4}\right)-$ in time and $\left(α\wedge \frac{1}{2}\right)-$ in space, provided $μ$ is absolutely continuous with an $α$-Hölder continuous density.

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