## The Annals of Probability

### Derivative and divergence formulae for diffusion semigroups

#### Abstract

For a semigroup $P_{t}$ generated by an elliptic operator on a smooth manifold $M$, we use straightforward martingale arguments to derive probabilistic formulae for $P_{t}(V(f))$, not involving derivatives of $f$, where $V$ is a vector field on $M$. For nonsymmetric generators, such formulae correspond to the derivative of the heat kernel in the forward variable. As an application, these formulae can be used to derive various shift-Harnack inequalities.

#### Article information

Source
Ann. Probab., Volume 47, Number 2 (2019), 743-773.

Dates
Revised: February 2018
First available in Project Euclid: 26 February 2019

https://projecteuclid.org/euclid.aop/1551171636

Digital Object Identifier
doi:10.1214/18-AOP1269

Mathematical Reviews number (MathSciNet)
MR3916933

Zentralblatt MATH identifier
07053555

#### Citation

Thalmaier, Anton; Thompson, James. Derivative and divergence formulae for diffusion semigroups. Ann. Probab. 47 (2019), no. 2, 743--773. doi:10.1214/18-AOP1269. https://projecteuclid.org/euclid.aop/1551171636

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