15,771 research outputs found
Equal Employment Opportunity Commission, Plaintiff, Phyllis Powell, Plaintiff-Intervenor, v. United Air Lines, Inc. d/b/a United Air Lines, Defendant
Equal Employment Opportunity Commission and Domingo Ramirez, Cuauhtémoc Guerrero v. Ceisel Masonry, Inc.
US Equal Employment Opportunity Commission v. ATMI Precast, Inc. and Waubonsee Development Company, Inc.
Entropy production and time-asymmetry in the presence of strong interactions
It is known that the equilibrium properties of open classical systems that
are strongly coupled to a heat bath are described by a set of thermodynamic
potentials related to the system's Hamiltonian of mean force. By adapting this
framework to a more general class of non-equilibrium states, we show that the
equilibrium properties of the bath can be well-defined, even when the system is
arbitrarily far from equilibrium and correlated with the bath. These states,
which retain a notion of temperature, take the form of conditional equilibrium
distributions. For out-of-equilibrium processes we show that the average
entropy production quantifies the extent to which the system-bath state is
driven away from the conditional equilibrium distribution. In addition, we show
that the stochastic entropy production satisfies a generalised Crooks relation
and can be used to quantify time-asymmetry of correlated non-equilibrium
processes. These results naturally extend the familiar properties of entropy
production in weakly-coupled systems to the strong coupling regime.
Experimental measurements of the entropy production at strong coupling could be
pursued using optomechanics or trapped ion systems, which allow strong coupling
to be engineered.Comment: 8 pages, 1 figure, comments welcom
Bias in the Boardroom: Psychological Foundations and Legal Implications of Corporate Cohesion
Leggett-Garg inequalities for quantum fluctuating work
The Leggett-Garg inequalities serve to test whether or not quantum
correlations in time can be explained within a classical macrorealistic
framework. We apply this test to thermodynamics and derive a set of Leggett-
Garg inequalities for the statistics of fluctuating work done on a quantum
system unitarily driven in time. It is shown that these inequalities can be
violated in a driven two-level system, thereby demonstrating that there exists
no general macrorealistic description of quantum work. These violations are
shown to emerge within the standard Two-Projective-Measurement scheme as well
as for alternative definitions of fluctuating work that are based on weak
measurement. Our results elucidate the influences of temporal correlations on
work extraction in the quantum regime and highlight a key difference between
quantum and classical thermodynamics.Comment: v2, 1 figure, accepted version to appear in Entropy (Special Issue on
"Quantum Thermodynamics II"
Bounds on Localized Modes in the Crystal Impurity Problem
Using general properties of the crystal site representation normal mode
matrix, we provide some very simple bounds on localized modes in simple,
body-centered and face-centered cubic crystals with substitutional point
defects. We derive a trace condition constraint on the net change in crystal
eigenfrequencies caused by the introduction of a defect, with the condition
being a completely general one which holds for any combination of central and
non-central crystal force-constants and for all-neighbor interactions. Using
this condition we show that the sufficient condition for producing localized
modes in an arbitrary cubic crystal by a mass change at the defect site is that
the defect mass be less than one half of that of the host atom mass which it
replaces, and that the sufficient condition for producing localized modes in an
arbitrary cubic crystal by force-constant changes alone is that the defect site
self force-constant be greater than twice that of the pure crystal self
force-constant of the host atom which it replaces.Comment: 25 pages, 3 figures, revtex4. Updated version contains much more
general bounds than original versio
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