6,559 research outputs found
Even and odd symplectic and K\"ahlerian structures on projective superspaces
Supergeneralization of \DC P(N) provided by even and odd K\"ahlerian
structures from Hamiltonian reduction are construct.Operator which
used in Batalin-- Vilkovisky quantization formalism and mechanics which are
bi-Hamiltonian under corresponding even and odd Poisson brackets are
considered.Comment: 19 page
Dynamics of Fluxon Lattice in Two Coupled Josephson Junctions
We study theoretically the dynamics of a fluxon Lattice (FL) in two coupled
Josephson junctions. We show that when the velocity of the moving FL exceeds
certain values , sharp resonances arise in the system which are
related to the excitation of the optical and acoustic collective modes. In the
interval a reconstruction of the FL occurs. We also establish that
one can excite localized nonlinear distortions (dislocations) which may
propagate through the FL and carry an arbitrary magnetic flux.Comment: 4 pages, 3 figures, corected typo
Two-photon decays of vector mesons and dilepton decays of scalar mesons in dense matter
Two-photon decays of vector mesons and dilepton decays of scalar mesons which
are forbidden in vacuum and can occur in dense baryonic matter due to the
explicit violation of Lorentz symmetry are described within a quark model of
the Nambu--Jona-Lasinio type. The temperature and chemical potential dependence
of these processes is investigated. It is found that their contribution to the
production of photons and leptons in heavy-ion collisions is enhanced near the
conditions corresponding to the restoration of chiral symmetry. Moreover, in
the case of the a_0 meson and especially the \rho-meson, a resonant behaviour
(an additional amplification) is observed due to the degeneration of \rho and
a_0 masses when a hot hadron matter is approaching a chirally symmetric phase.Comment: 20 figures, IOP styl
Influence of contacts on the microwave response of a two-dimensional electron stripe
Electromagnetic response of a finite-width two-dimensional electron stripe
with attached metallic side contacts is theoretically studied. It is shown that
contacts substantially influence the position, the linewidth, and the amplitude
of plasmon-polariton resonances in the stripe. In finite magnetic fields,
absorption of the wave with the inactive circular polarization (which is not
absorbed in an infinite system without contacts) may become larger than that of
the wave with the active polarization. The results are discussed in view of
recent microwave experiments in two-dimensional electron systems.Comment: 13 pages, incl. 9 figures, the paper has been substantially modified
and extended, new results have been added. Accepted for publication in Phys.
Rev.
Degenerate Odd Poisson Bracket on Grassmann Variables
A linear degenerate odd Poisson bracket (antibracket) realized solely on
Grassmann variables is presented. It is revealed that this bracket has at once
three nilpotent -like differential operators of the first, the second
and the third orders with respect to the Grassmann derivatives. It is shown
that these -like operators together with the Grassmann-odd nilpotent
Casimir function of this bracket form a finite-dimensional Lie superalgebra.Comment: 5 pages, LATEX. Corrections of misprints. The relation (23) is adde
The electronic structure of disordered metals considering dynamic properties of ionic subsystem
Heat transport in proximity structures
We study heat and charge transport through a normal diffusive wire coupled
with a superconducting wire over the region smaller than the coherence length.
Due to partial Andreev reflection of quasiparticles from the interface, the
subgap thermal flow is essentially suppressed and approaches zero along with
energy, which is specific for diffusive structures. Whereas the electric
conductance shows conventional reentrance effect, the thermal conductance
rapidly decreases with temperature which qualitatively explains the results of
recent experiments. In the Andreev interferometer geometry, the thermal
conductance experiences full-scale oscillations with the order parameter phase
difference.Comment: 4 pages, 4 figures, minor revision, to be published in Phys. Rev.
Let
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