# Interior Sobolev regularity for fully nonlinear parabolic equations

## TL;DR

This paper establishes sharp Sobolev regularity estimates for solutions of fully nonlinear parabolic equations under minimal assumptions, using recession functions and limiting configurations to derive new regularity results.

## Contribution

It introduces a novel approach leveraging recession functions to obtain interior Sobolev regularity for fully nonlinear parabolic equations with minimal conditions.

## Key findings

- Solutions are in W^{2,1;p}_{loc}
- Develops a parabolic Escauriaza's exponent
- Provides universal modulus of continuity and BMO estimates

## Abstract

In the present paper, we establish sharp Sobolev estimates for solutions of fully nonlinear parabolic equations, under minimal, asymptotic, assumptions on the governing operator. In particular, we prove that solutions are in $W^{2,1;p}_{loc}$. Our argument unfolds by importing improved regularity from a limiting configuration. In this concrete case, we recur to the recession function associated with $F$. This machinery allows us to impose conditions solely on the original operator at the infinity of $\mathcal{S}(d)$. From a heuristic viewpoint, integral regularity would be set by the behavior of $F$ at the ends of that space. Moreover, we explore a number of consequences of our findings, and develop some related results; these include a parabolic version of Escauriaza's exponent, a universal modulus of continuity for the solutions and estimates in $p-BMO$ spaces.