The Prescribed $Q$-Curvature Flow for Arbitrary Even Dimension in a Critical Case

TL;DR

This paper investigates the convergence of the prescribed Q-curvature flow on even-dimensional manifolds in the critical case, extending previous results and providing explicit energy limit expressions during blow-up scenarios.

Contribution

It establishes convergence under geometric conditions in the critical case and generalizes prior work from dimension 2 to all even dimensions.

Findings

Flow converges under certain geometric hypotheses in the critical case.

Provides explicit energy limit expressions during blow-up.

Extends existence results from 4D to arbitrary even dimensions.

Abstract

In this paper, we study the prescribed $Q$-curvature flow equation on a arbitrary even dimensional closed Riemannian manifold $(M,g)$, which was introduced by S. Brendle in \cite{B2003}, where he proved the flow exists for long time and converges at infinity if the GJMS operator is weakly positive with trivial kernel and $\int_M Qd\mu < (n-1)!\Vol\left( S^n \right) $. In this paper we study the critical case that $\int_M Qd\mu = (n-1)!\Vol\left( S^n \right)$, we will prove the convergence of the flow under some geometric hypothesis. In particular, this gives a new proof of Li-Li-Liu's existence result in \cite{LLL2012} in dimensiona 4 and extend the work of Li-Zhu \cite{LZ2019} in dimension 2 to general even dimensions. In the proof, we give a explicit expression of the limit of the corresponding energy functional when the blow up occurs.