The ${\mathrm{L}}^p$-index of the Hodge-Dirac operator on compact Riemannian manifolds

Abstract

We investigate the spectral and index-theoretic properties of the Hodge-Dirac operator $D=\mathrm{d}+{\mathrm{d}}^{\ast }$ acting on the Banach space ${\mathrm{L}}^p({\Omega }^{\bullet }(M))$ of differential forms over a compact Riemannian manifold $M$. Relying on the compactness of $M$, we establish that this operator is bisectorial and admits a bounded ${\mathrm{H}}^{\infty }$ functional calculus, without curvature assumptions. This result enables us to prove that the triple $(\mathrm{C}(M),{\mathrm{L}}^p({\Omega }^{\bullet }(M)),D)$ constitutes a compact Banach spectral triple. We then investigate consistent pairings between the Banach K-homology and the K-theory of the algebra $\mathrm{C}(M)$, identifying the resulting Fredholm indices with classical topological invariants, and hence showing that they are independent of $p$. We recover the classical Euler characteristic and the Hirzebruch signature as ${\mathrm{L}}^p$-indices, demonstrating the effectiveness of Banach noncommutative geometry for geometric analysis, beyond the Hilbertian setting.

56 pages; improvements