The entropy formula for linear heat equation

Small time asymptotics of the entropy of the heat kernel on a Riemannian manifold

We give an asymptotic expansion of the relative entropy between the heat kernel $q_Z(t,z,w)$ of a compact Riemannian manifold $Z$ and the normalized Riemannian volume for small values of $t$ and for a fixed element $z\in Z$. We prove that coefficients in the expansion can be expressed as universal polynomials in the components of the curvature tensor and its covariant derivatives at $z$, when they are expressed in terms of normal coordinates. We describe a method to compute the coefficients, and we use the method to compute the first three coefficients. The asymptotic expansion is necessary fo…

The monotonicity of an entropy like energy for the heat equation on a quaternionic contact and CR manifolds

A proof of the monotonicity of an entropy like energy for the heat equation on a quaternionic contact and CR manifolds is proven

$W$-entropy, super Perelman Ricci flows and $(K, m)$-Ricci solitons

In this paper, we prove the characterization of the $(K, \infty)$-super Perelman Ricci flows by various functional inequalities and gradient estimate for the heat semigroup generated by the Witten Laplacian on manifolds equipped with time dependent metrics and potentials. As a byproduct, we derive the Hamilton type dimension free Harnack inequality on manifolds with $(K, \infty)$-super Perelman Ricci flows. Based on a new second order differential inequality on the Boltzmann-Shannon entropy for the heat equation of the Witten Laplacian, we introduce a new $W$-entropy quantity and prove its mon…

四元数接触几何中热方程的Li-Yau次梯度估计与Perelman型熵公式

Li-Yau sub-gradient estimates and Perelman-type entropy formulas for the heat equation in quaternionic contact geometry

本文在紧致四元数接触流形上建立qc热方程的Li-Yau型次梯度估计，并在qc-爱因斯坦流形上推导Perelman型熵公式，推广了经典黎曼几何结果。

Entropy and heat kernel bounds on a Ricci flow background

In this paper we establish new geometric and analytic bounds for Ricci flows, which will form the basis of a compactness, partial regularity and structure theory for Ricci flows in [Bam20a, Bam20b]. The bounds are optimal up to a constant that only depends on the dimension and possibly a lower scalar curvature bound. In the special case in which the flow consists of Einstein metrics, these bounds agree with the optimal bounds for spaces with Ricci curvature bounded from below. Moreover, our bounds are local in the sense that if a bound depends on the collapsedness of the underlying flow, then …

基于热流与熵耗散的等周不等式信息论路径

An Information-Theoretic Route to Isoperimetric Inequalities via Heat Flow and Entropy Dissipation

本文提出基于热流下熵耗散的等周不等式信息论方法，将扩散视作含噪信道推导互信息衰减与边界测度的关联，证明欧氏等周不等式并拓展至黎曼流形场景，搭建几何分析与信息论的联系。