On the dynamics of positively curved metrics on $\mathrm{SU}(3)/{\mathrm{T}}^2$ under the homogeneous Ricci flow

Abstract

In this note, we show that the classical Wallach manifold $\mathrm{SU}(3)/{\mathrm{T}}^2$-admits metrics of positive intermediate Ricci curvature $({\mathrm{Ric}}_d>0)$ for $d=1,2,3,4,5$ that lose these properties under the homogeneous Ricci flow for $d=1,2,3,5$. We make the same analyses to the family of Riemannian flag manifolds $\mathrm{SU}(m+2p)/\mathrm{S}(\mathrm{U}(m)\times \mathrm{U}(p)\times \mathrm{U}(p))$, concluding similar results. These explicitly verify some claims expected to be true among experts (see \cite{BW}) for positive Ricci curvature and intermediate positive Ricci curvature. Our technique is only possible due to the global behavior understanding of the homogeneous Ricci flow for invariant metrics on these manifolds.

arXiv commentAccepted version. To appear in the Special Issue of the Workshop on Geometric Structures and Moduli Spaces (WGSMS). Revista Matemática Contemporânea