651,146 research outputs found
Exact treatment of states
Using the basic ingredient of supersymmetry, a general procedure for the
treatment of quantum states having nonzero angular momenta is presented.Comment: 7 pages article in LaTEX (uses standard article.sty). No Figures.
Accepted by Chinese Physics Letters (2004, vol 21. No.9
The dynamics of neutron star crusts: Lagrangian perturbation theory for a relativistic superfluid-elastic system
The inner crust of a mature neutron star is composed of an elastic lattice of
neutron-rich nuclei penetrated by free neutrons. These neutrons can flow
relative to the crust once the star cools below the superfluid transition
temperature. In order to model the dynamics of this system, which is relevant
for a range of problems from pulsar glitches to magnetar seismology and
continuous gravitational-wave emission from rotating deformed neutron stars, we
need to understand general relativistic Lagrangian perturbation theory for
elastic matter coupled to a superfluid component. This paper develops the
relevant formalism to the level required for astrophysical applications.Comment: 31 pages, double spacing, minor typos fixe
Recent developments in rotary-balance testing of fighter aircraft configurations at NASA Ames Research Center
Two rotary balance apparatuses were developed for testing airplane models in a coning motion. A large scale apparatus, developed for use in the 12-Foot Pressure Wind tunnel primarily to permit testing at high Reynolds numbers, was recently used to investigate the aerodynamics of 0.05-scale model of the F-15 fighter aircraft. Effects of Reynolds number, spin rate parameter, model attitude, presence of a nose boom, and model/sting mounting angle were investigated. A smaller apparatus, which investigates the aerodynamics of bodies of revolution in a coning motion, was used in the 6-by-6 foot Supersonic Wind Tunnel to investigate the aerodynamic behavior of a simple representation of a modern fighter, the Standard Dynamic Model (SDM). Effects of spin rate parameter and model attitude were investigated. A description of the two rigs and a discussion of some of the results obtained in the respective test are presented
Quantum and Classical Binomial Distributions for the Charge Transmitted through Coherent Conductor
We discuss controversial results for the statistics of charge transport
through coherent conductors. Two distribution functions for the charge
transmitted was obtained previously, first by L.Levitov and G.Lesovik, [JETP
Letters Vol.55 p.555 (1992)] and the other initially by the same authors [ibid.
Vol.58 p.230 (1993)], and later the result was reproduced by several authors.
The latter distribution functions actually coincides with classical binomial
distribution (though obtained purely quantum mechanically) former (result of
1992) is different and we call it here quantum binomial distribution. The two
distribution function represent two opposite universal limits - one is purely
quantum, where interference is important, and the other is semiclassical, where
interference is smeared out. We show, that high order charge correlators,
determined by the either distribution functions, can all be measured in
different setups. The high order current correlators, starting the third order,
reveal (missed in previous studies) special oscillating frequency dependence on
the scale of the inverted time flight from the obstacle to the measuring point.
Depending on setup, the oscillating terms give substantially different
contributions.Comment: 4 pages; english versio
Induced low-energy effective action in the 6D, N=(1,0) hypermultiplet theory on the vector multiplet background
We consider the six dimensional N=(1,0) hypermultiplet model coupled to an
external field of the Abelian vector multiplet in harmonic superspace approach.
Using the superfield proper-time technique we find the divergent part of the
effective action and derive the complete finite induced low-energy superfield
effective action. This effective action depends on external field and contains
in bosonic sector all the powers of the constant Maxwell field strength. The
obtained result can be treated as the 6D, N=(1,0) supersymmetric
Heisenberg-Euler type effective action.Comment: 15 pages; v2: minor correction
Dynamic vortex mass in clean Fermi superfluids and superconductors
We calculate the dynamic vortex mass for clean Fermi superfluids including
both s- and d-wave superconductors as a response to a vortex acceleration.
Assuming a finite quasiparticle mean free time, the vortex mass appears to be a
tensor. The diagonal component dominates in the limit of long mean free time
while the off-diagonal mass takes over in the moderately clean regime.Comment: 4 pages, no figures, typeset using RevTe
Radiative parton energy loss and jet quenching in high-energy heavy-ion collisions
We study within the light-cone path integral approach [3] the effect of the
induced gluon radiation on high-p_{T} hadrons in high-energy heavy-ion
collisions. The induced gluon spectrum is represented in a new form which is
convenient for numerical simulations. For the first time, computations are
performed with a realistic parametrization of the dipole cross section. The
results are in reasonable agreement with suppression of high-p_{T} hadrons in
Au+Au collisions at \sqrt{s}=200 GeV observed at RHIC.Comment: 12 pages, 3 epsi figures. Typos correcte
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