3,749 research outputs found
A Slavnov-Taylor identity and equality of damping rates for static transverse and longitudinal gluons in hot QCD
A Slavnov-Taylor identity is derived for the gluon polarization tensor in hot
QCD. We evaluate its implications for damping of gluonic modes in the plasma.
Applying the identity to next to the leading order in hard-thermal-loop
resummed perturbation theory, we derive the expected equality of damping rates
for static transverse and longitudinal (soft) gluons. This is of interest also
in view of deviating recent reports of based
on a direct calculation of .Comment: 13 pages, 1 figure, LaTe
Complementarity of Entanglement and Interference
A complementarity relation is shown between the visibility of interference
and bipartite entanglement in a two qubit interferometric system when the
parameters of the quantum operation change for a given input state. The
entanglement measure is a decreasing function of the visibility of
interference. The implications for quantum computation are briefly discussed.Comment: Final version, to appear on IJMPC; minor revision
Effect of electron and hole doping on the structure of C, Si, and S nanowires
We use ab initio density functional calculations to study the effect of
electron and hole doping on the equilibrium geometry and electronic structure
of C, Si, and S monatomic wires. Independent of doping, all these nanowires are
found to be metallic. In absence of doping, C wires are straight, whereas Si
and S wires display a zigzag structure. Besides two preferred bond angles of 60
deg and 120 deg in Si wires, we find an additional metastable bond angle of 90
deg in S wires. The equilibrium geometry and electronic structure of these
nanowires is shown to change drastically upon electron and hole doping.Comment: 5 pages including 5 figure
Unemployment Compensation—Spouse\u27s Relocation Due to Employment Is a Compelling Person Reason Constituting Good Cause for Voluntary Termination—Ayers v. Department of Employment Security, 85 Wn. 2d 550, 536 P.2d 610 (1975)
This note will analyze the impact of Ayers upon the traditional dual administrative test of no alternative and preservation of employment used to determine whether, under the particular facts and circumstances, compelling personal reasons \u27 meeting the statutory requirement of good cause for voluntary termination of employment exist. Although the Washington court did not discuss this test, the Ayers decision should not be construed as a rejection of its continued vitality. In addition, this note will analyze the factors which should be considered when applying the no alternative and preservation of employment standards to spouse relocation situations in the wake of Ayers. It concludes that a more careful adherence to established administrative tests is necessary to ensure that awards of unemployment compensation benefits are made in accordance with the articulated objectives of the state unemployment compensation la
Interplay between structure and magnetism in nanowires
We investigate the equilibrium geometry and electronic structure of
MoSI nanowires using ab initio Density Functional
calculations. The skeleton of these unusually stable nanowires consists of
rigid, functionalized Mo octahedra, connected by flexible, bi-stable sulphur
bridges. This structural flexibility translates into a capability to stretch up
to approximate 20% at almost no energy cost. The nanowires change from
conductors to narrow-gap magnetic semiconductors in one of their structural
isomers.Comment: 4 pages with PRL standards and 3 figure
Dynamic SU(2) Lattice Gauge Theory at Finite Temperature
The dynamic relaxation process for the (2+1)--dimensional SU(2) lattice gauge
theory at critical temperature is investigated with Monte Carlo methods. The
critical initial increase of the Polyakov loop is observed. The dynamic
exponents and as well as the static critical exponent
are determined from the power law behaviour of the Polyakov loop, the
auto-correlation and the second moment at the early stage of the time
evolution. The results are well consistent and universal short-time scaling
behaviour of the dynamic system is confirmed. The values of the exponents show
that the dynamic SU(2) lattice gauge theory is in the same dynamic universality
class as the dynamic Ising model.Comment: 10 pages with 2 figure
Short-time dynamics of the positional order of the two-dimensional hard disk system
We investigate the positional order of the two-dimensional hard disk model
with short-time dynamics and equilibrium simulations. The melting density and
the critical exponents z and eta are determined. Our results rule out a phase
transition as predicted by the Kosterlitz-Thouless-Halperin-Nelson-Young theory
as well as a first-order transition.Comment: 8 pages, 4 figures, minor change
Mixed initial conditions to estimate the dynamic critical exponent in short-time Monte Carlo simulation
We explore the initial conditions in short-time critical dynamics to propose
a new method to evaluate the dynamic exponent z. Estimates are obtained with
high precision for 2D Ising model and 2D Potts model for three and four states
by performing heat-bath Monte Carlo simulations.Comment: Latex paper, 2 eps figure
Dynamics of ripple formation on silicon surfaces by ultrashort laser pulses in sub-ablation conditions
An investigation of ultrashort pulsed laser induced surface modification due
to conditions that result in a superheated melted liquid layer and material
evaporation are considered. To describe the surface modification occurring
after cooling and resolidification of the melted layer and understand the
underlying physical fundamental mechanisms, a unified model is presented to
account for crater and subwavelength ripple formation based on a synergy of
electron excitation and capillary waves solidification. The proposed
theoretical framework aims to address the laser-material interaction in
sub-ablation conditions and thus minimal mass removal in combination with a
hydrodynamics-based scenario of the crater creation and ripple formation
following surface irradiation with single and multiple pulses, respectively.
The development of the periodic structures is attributed to the interference of
the incident wave with a surface plasmon wave. Details of the surface
morphology attained are elaborated as a function of the imposed conditions and
results are tested against experimental data
- …