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6 papers · 1 filter
Quark Spin and the Theta-Term for the QCD String
J. Pawelczyk
We describe a way in which spin of quarks can enter a consistent QCD string theory. We show that the spin factor of the 4d massless, spin 1/2 fermions is related to the self-inters…
Numerical study of radiative corrections in the low region at HERA
K. Charchula, J. Gajewski
A detailed numerical study of radiative corrections in the low region at the HERA collider was performed. The specific case of the total photoproduction cross section me…
Modular Groups for Twisted Narain Models
J. Erler, M. Spalinski
We demonstrate how to find modular discrete symmetry groups for orbifolds. The orbifold is treated in detail as a non-trivial example of a orbifold model. We gi…
Singular measures in circle dynamics
Jacek Graczyk, Grzegorz Swiatek
Critical circle homeomorphisms have an invariant measure totally singular with respect to the Lebesgue measure. We prove that singularities of the invariant measure are of Holder t…
Matter Coupling and Spontaneous Symmetry Breaking in Topological Gravity
T. T. Burwick, A. H. Chamseddine, K. Meissner
Matter is coupled to three-dimensional gravity such that the topological phase is allowed and the (anti-) de Sitter or Poincaré symmetry remains intact. Spontaneous symmetry breaki…
Critical circle maps near bifurcation
Jacek Graczyk, Grzegorz Swiatek
We estimate harmonic scalings in the parameter space of a one-parameter family of critical circle maps. These estimates lead to the conclusion that the Hausdorff dimension of the c…