Spectral Triples and Zeta-Cycles

Abstract

We exhibit very small eigenvalues of the quadratic form associated to the Weil explicit formulas restricted to test functions whose support is within a fixed interval with upper bound S. We show both numerically and conceptually that the associated eigenvectors are obtained by a simple arithmetic operation of finite sum using prolate spheroidal wave functions associated to the scale S. Then we use these functions to condition the canonical spectral triple of the circle of length L=2 Log(S) in such a way that they belong to the kernel of the perturbed Dirac operator. We give numerical evidence that, when one varies L, the low lying spectrum of the perturbed spectral triple resembles the low lying zeros of the Riemann zeta function. We justify conceptually this result and show that, for each eigenvalue, the coincidence is perfect for the special values of the length L of the circle for which the two natural ways of realizing the perturbation give the same eigenvalue. This fact is tested numerically by reproducing the first thirty one zeros of the Riemann zeta function from our spectral side, and estimate the probability of having obtained this agreement at random, as a very small number whose first fifty decimal places are all zero. The theoretical concept which emerges is that of zeta cycle and our main result establishes its relation with the critical zeros of the Riemann zeta function and with the spectral realization of these zeros obtained by the first author.

Reflective prolate-spheroidal operators and the KP/KdV equations

“…This property first played a key role in the analysis of Landau, Pollak and Slepian of time-band limiting [24,28,29] in the 60's and then in the works of Mehta [25] and Tracy-Widom [30,31] on scaling limits of random matrices in the 90's. Connes, Consani, Moscovici [10,11,12] found fundamental applications of the prolate spheroidal property of a completely different nature. They proved that the asymptotics of the zeros of the Riemann zeta function in two different regimes can be both modelled using classical prolate spheroidal functions.…”

Algebras of commuting differential operators for integral kernels of Airy type

“…x,sym (Ψ 2 ) = 32, and therefore T 2 will commute with a differential operator S 2 (z, ∂ z ) in F 10,10 z,sym (Ψ 2 ). Taking t 1 = t 2 = 1, and solving the linear system describing the vanishing of the concomitants, we find differential operators of order 10, 12, 14, 16, and 18 commuting with T 2 .…”

“…The so called "prolate spheroidal wave functions," which arise in the case of the sinc kernel and their corresponding integraldifferential pair of operators, have played an important role in areas far removed from signal processing that motivated the research of Slepian and collaborators. We give only two instances of this, but we are sure that other people can provide other examples: the paper by J. Kiukas and R. Werner [24] in connection with Bell's inequalities, and the program by A. Connes in connection with the Riemann hypothesis with C. Consani, M. Marcolli and H. Moscovici [10,11,12].…”