# The Rohde--Schramm theorem, via the Gaussian free field

## TL;DR

This paper provides a new, concise proof of the Rohde--Schramm theorem on the existence of SLE$_ppa$ curves for ppa , using Gaussian free fields and Liouville quantum gravity coupling.

## Contribution

The authors introduce a novel proof technique for the Rohde--Schramm theorem leveraging Gaussian free fields and Liouville quantum gravity, simplifying the derivative estimation process.

## Key findings

- Recovered the derivative exponent originally obtained by Rohde and Schramm.
- Provided a simplified proof of the Rohde--Schramm theorem.
- Confirmed the optimality of the derivative exponent by Lawler and Viklund.

## Abstract

The Rohde--Schramm theorem states that Schramm--Loewner Evolution with parameter $\kappa$ (or SLE$_\kappa$ for short) exists as a random curve, almost surely, if $\kappa \neq 8$. Here we give a new and concise proof of the result, based on the Liouville quantum gravity coupling (or reverse coupling) with a Gaussian free field. This transforms the problem of estimating the derivative of the Loewner flow into estimating certain correlated Gaussian free fields. While the correlation between these fields is not easy to understand, a surprisingly simple argument allows us to recover a derivative exponent first obtained by Rohde and Schramm, subsequently shown to be optimal by Lawler and Viklund, which then implies the Rohde--Schramm theorem.