12,315,727 research outputs found
On unification of gravitation and electromagnetism in the framework of a general-relativistic approach
We consider the unification problem for the gravitational and electromagnetic
interactions and its possible solution on the basis of the existence of an
effective Riemannian space in nonlinear electrodynamicsComment: 3 pages, Talk given at the International Conference RUSGRAV-13, June
23-28, 2008, PFUR, Mosco
A local gauge invariant infrared regularization of the Yang-Mills theory
A local gauge invariant infrared regularization for the Yang-Mills theory is
constructed on the basis of a higher derivative formulation of the model.Comment: 7 page
Multiphonon anharmonic decay of a quantum mode
A nonperturbative theory of multiphonon anharmonic transitions between energy
levels of a local mode is presented. It is shown that the rate of transitions
rearranges near the critical level number : at smaller the process
slows down, while at larger it accelerates in time, causing a jump-like
loss of energy followed by the generation of phonon bursts. Depending on
parameters, phonons are emitted in pairs, triplets etc.Comment: submitted to Europhys.Let
Influence of high magnetic fields on superconducting transition of one-dimensional Nb and MoGe nanowires
The effects of strong magnetic field on superconducting Nb and MoGe nanowires
with diameter nm have been studied. We have found that the
Langer-Ambegaokar-McCumber-Halperin (LAMH) theory of thermally activated phase
slips is applicable in a wide range of magnetic fields and describes well the
temperature dependence of the wire resistance, over eleven orders of magnitude.
The field dependence of the critical temperature, , extracted from the
LAMH fits is in good quantitative agreement with the theory of pair-breaking
perturbations that takes into account both spin and orbital contributions. The
extracted spin-orbit scattering time agrees with an estimate , where is the elastic scattering time and
is the atomic number.Comment: accepted for publication in Physical Review Letter
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