FRG Collaborative Research: Noncommutative Geometry and Number Theory

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The interaction between noncommutative geometry and number theoryrepresents a new direction, which has rapidly matured in the pastfew years. The proposed collaborative research project is devoted toapplying the methods and tools of noncommutative geometry tospecific topics in number theory, pertaining to the study of theexplicit class field theory problem (Hilbert's 12th problem), of theRiemann zeta function and of the L-functions of algebraic varieties.One anticipated outcome will be a novel understanding of the Weilexplicit formulae as Lefschetz trace formulae in the context ofcyclic cohomology. Another central aspect of the project involvessupplementing Manin's approach to Stark's conjectures for realquadratic fields (via noncommutative tori with real multiplication)with ideas stemming from the recent investigation of the quantumstatistical mechanical properties of noncommutative spaces ofQ-lattices modulo commensurability. New results on modular forms andHecke operators are expected, arising from the transfer oftransverse geometry concepts and constructions to the setting ofmodular forms. The formalism of spectral triples together with thelocal index formula in noncommutative geometry will be exploited toinvestigate rigid analytic spaces more general than Mumford curves.Significant progress is also anticipated in the uncovering of therelationship between residues of Feynman graphs in quantum fieldtheory and periods of mixed Tate motives.This collaborative research project aims to shed light on a numberof important topics pertaining to the rich and largely untappedinterconnection between the fields of noncommutative geometry,number theory and mathematical physics. These topics address centralaspects and open problems, that involve some of the key mathematicalobjects in the latter fields, such as the celebrated Riemann zetafunction and its generalizations called L-functions in number theoryand Feynman integrals in perturbative quantum field theory. Theirinvestigation will be approached in a novel and unified manner,through the methods of noncommutative geometry, a discipline whichgrew out of the fusion between one of the oldest branches ofmathematics -- geometry, and one of the youngest -- quantummechanics.