Nuclear Theory·nucl-th
8 papers—4 primary·4 cross-listed
[Submitted on 4 Apr 2015] (cross-list from hep-ph)
S. J. Brodsky🇺🇸 · S. Gardner🇺🇸
A Comment on the Letter by P. Jimenez-Delgado, T.J. Hobbs, J.T. Londergan, and W. Melnitchouk, Phys. Rev. Lett. 114, 082002 (2015).
[Submitted on 6 Apr 2015] (cross-list from hep-ph)
Alejandro Ayala🇲🇽 · C. A. Dominguez🇿🇦 · L. A. Hernandez🇿🇦 · M. Loewe🇿🇦 · Juan Cristobal Rojas🇨🇱 · Cristian Villavicencio🇨🇱
We study QCD finite energy sum rules (FESR) for the axial-vector current correlator in the presence of a magnetic field, in the weak field limit and at zero temperature. We find that the perturbative QCD as well as the hadronic contribution to the sum rules get explicit magnetic field-dependent corrections and that these in turn induce a magnetic field dependence on the deconfinement phenomenological parameter s_0 and on the gluon condensate. The leading corrections turn out to be quadratic in the field strength. We find from the dimension d=2 first FESR that the magnetic field dependence of s_0 is proportional to the absolute value of the light-quark condensate. Hence, it increases with increasing field strength. This implies that the parameters describing chiral symmetry restoration and deconfinement behave similarly as functions of the magnetic filed. Thus, at zero temperature the magnetic field is a catalysing agent of both chiral symmetry breaking and confinement. From the dimension d=4 second FESR we obtain the behavior of the gluon condensate in the presence of the external magnetic field. This condensate also increases with increasing field strength.
[Submitted on 6 Apr 2015] (cross-list from physics.ins-det)
Vitaliy D. Rusov · Victor A. Tarasov · Volodymyr N. Vashchenko · Sergei A. Chernezhenko · Andrei A. Kakaev · Oksana I. Pantak
The main aim of this paper is to solve the technological problems of the TWR based on the technical concept described in our priority of invention reference, which makes it impossible, in particular, for the fuel claddings damaging doses of fast neutrons to excess the ~200 dpa limit. Thus the essence of the technical concept is to provide a given neutron flux at the fuel claddings by setting the appropriate speed of the fuel motion relative to the nuclear burning wave. The basic design of the fast uranium-plutonium nuclear traveling-wave reactor with a softened neutron spectrum is developed, which solves the problem of the radiation resistance of the fuel claddings material.
[Submitted on 6 Apr 2015] (cross-list from hep-th)
Yanyan Bu🇮🇱 · Michael Lublinsky🇮🇱 · Amir Sharon🇮🇱
Relativistic hydrodynamics dual to Einstein-Gauss-Bonnet gravity in asymptotic space is under study. To linear order in the amplitude of the fluid velocity and temperature, we derive the fluid's stress-energy tensor via an all-order resummation of the derivative terms. Each order is accompanied by new transport coefficients, which all together could be compactly absorbed into two functions of momenta, referred to as viscosity functions. Via inverse Fourier transform, these viscosities appear as memory functions in the constitutive relation between components of the stress-energy tensor.
first authorsco-authorsvia INSPIRE