The character map in (twisted differential) non-abelian cohomology

Abstract

We extend the Chern character on K-theory, in its generalization to the Chern-Dold character on generalized cohomology theories, further to (twisted, differential) non-abelian cohomology theories, where its target is a non-abelian de Rham cohomology of twisted L-infinity algebra valued differential forms. The construction amounts to leveraging the fundamental theorem of dg-algebraic rational homotopy theory to a twisted non-abelian generalization of the de Rham theorem. We show that the non-abelian character reproduces, besides the Chern-Dold character, also the Chern-Weil homomorphism as well as its secondary Cheeger-Simons homomorphism on (differential) non-abelian cohomology in degree 1, represented by principal bundles (with connection); and thus generalizes all these to higher (twisted, differential) non-abelian cohomology, represented by higher bundles/higher gerbes (with higher connections). As a fundamental example, we discuss the twisted non-abelian character map on twistorial Cohomotopy theory over 8-manifolds, which can be viewed as a twisted non-abelian enhancement of topological modular forms (tmf) in degree 4. This turns out to exhibit a list of subtle topological relations that in high energy physics are thought to govern the charge quantization of fluxes in M-theory.

124 pages; v2: one more example and further references added; v3: several improvements and more details, expanded introduction

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Cited by in corpus (15)

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• Higher Topos Theory in Physics
• Cyclification of Orbifolds
• Quantum Observables of Quantized Fluxes
• Anyons on M5-Probes of Seifert 3-Orbifolds via Flux Quantization
• The Smith Fiber Sequence and Invertible Field Theories
• The Quantum Monadology
• Engineering of Anyons on M5-Probes via Flux Quantization
• Gauge potentials on the M5 brane in twisted equivariant cohomotopy
• Quantum and Reality
• Mysterious Triality and the Exceptional Symmetry of Loop Spaces