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

TL;DR

This paper studies the spectral and index properties of the Hodge-Dirac operator on compact Riemannian manifolds within Banach space frameworks, extending classical invariants like Euler characteristic and signature to L^p settings.

Contribution

It proves the bisectoriality and bounded H-infinity calculus of the Hodge-Dirac operator on L^p spaces without curvature assumptions, establishing a Banach spectral triple and linking indices to topological invariants.

Findings

Hodge-Dirac operator is bisectorial on L^p spaces.

Established a bounded H-infinity functional calculus for the operator.

Identified L^p-indices with classical topological invariants such as Euler characteristic.

Abstract

We investigate the spectral and index-theoretic properties of the Hodge-Dirac operator $D = \mathrm{d} + \mathrm{d}^*$ 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.