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Let $M$ be a Riemann surface (or a higher dimensional manifold) and let us let's assume that it's geodesically complete. Let $W(t)$ be a Brownian motion on the surface accordingly to the manifold's Laplacian and let $r>0$.

Define the Wiener sausage as:

$$W_{r}(t):=\{ x\in M: d(x,W(s))\leq r\quad\text{for}\quad 0\leq s\leq t \}.$$

It is known that in $\mathbb{R}^{2}$ and for t sufficiently large and $r$ fixed

$$\mathbb{E}[\mathrm{vol}(W_{r}(t))]=\frac{2\pi t}{\log(t)}(1+o(1)).$$

Is there any analogue result for a general Riemann surface or at least the hyperbolic space?

Thanks!

--Gabriel

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# Wiener Sausages in Riemann Surfaces

Let $M$ be a Riemann surface and let us assume that it's geodesically complete. Let $W(t)$ be a Brownian motion on the surface and let $r>0$.

Define the Wiener sausage as:

$$W_{r}(t):=\{ x\in M: d(x,W(s))\leq r\quad\text{for}\quad 0\leq s\leq t \}.$$

It is known that in $\mathbb{R}^{2}$ and for t sufficiently large

$$\mathbb{E}[\mathrm{vol}(W_{r}(t))]=\frac{2\pi t}{\log(t)}(1+o(1)).$$

Is there any analogue result for a general Riemann surface or at least the hyperbolic space?

Thanks!

--Gabriel