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20 papers · 1 filter
Hadronic matrix elements of gluon operators in the instanton vacuum
D. I. Diakonov, M. V. Polyakov, C. Weiss
We propose a method to evaluate hadronic matrix elements of QCD gluon operators in the instanton vacuum. We construct the ground state of the interacting instanton ensemble for non…
Approach to ergodicity in quantum wave functions
Bruno Eckhardt, Shmuel Fishman, Jonathan Keating +3
According to theorems of Shnirelman and followers, in the semiclassical limit the quantum wavefunctions of classically ergodic systems tend to the microcanonical density on the ene…
Band spectra of rectangular graph superlattices
Pavel Exner, Ralf Gawlista
We consider rectangular graph superlattices of sides l1, l2 with the wavefunction coupling at the junctions either of the delta type, when they are continuous and the sum of their…
Analytic structure of meson propagators in the proper-time regularized Nambu--Jona-Lasinio model
W. Broniowski, G. Ripka, E. Nikolov +1
We analyze the analytic structure of meson propagators in the Nambu--Jona-Lasinio model with a proper-time regulator. We show that the regulator produces unphysical complex singula…
Semiclassical form factor of matrix element fluctuations
Bruno Eckhardt, Joerg Main
We analyze within a semiclassical approximation the form factor for the fluctuations of quantum matrix elements around their classical average. We find two contributions: one is pr…
Strangeness in the Scalar Form Factor of the Nucleon
Hyun-Chul Kim, Andree Blotz, Carsten Schneider +1
The scalar form factor of the nucleon and related physical quantities are investigated in the framework of the semibosonized SU(3) Nambu-Jona-Lasinio soliton model. We take into ac…