Sharp remainder of the $L^{p}$-Poincar\'e inequality for Baouendi-Grushin vector fields

TL;DR

This paper derives a sharp remainder formula for the $L^{p}$-Poincaré inequality associated with Baouendi-Grushin vector fields, providing explicit constants and applications to nonlinear PDEs.

Contribution

It establishes a new sharp remainder formula for the $L^{p}$-Poincaré inequality in the Baouendi-Grushin setting, including explicit constants and applications to nonlinear equations.

Findings

Derived a sharp remainder formula for the Poincaré inequality.

Obtained explicit optimal constants under certain conditions.

Applied results to analyze solutions of nonlinear PDEs.

Abstract

In this paper, we establish a sharp remainder formula for the Poincar\'e inequality for Baouendi-Grushin vector fields in the setting of $L^{p}$ for complex-valued functions. In special cases, we recover previously known results. Consequently, we also derive the $L^{p}$-Poincar\'e inequality with an explicit optimal constant under a certain assumption. Additionally, we provide estimates of the remainder term for $p\geq2$ and $1<p<2\leq n<\infty$. As an application, we obtain a blow-up in finite time and global existence of the positive solutions to the initial-boundary value problem of the doubly nonlinear porous medium equation involving a degenerate nonlinear operator $\Delta_{\gamma,p}$.