869 research outputs found
Tsallis entropy: How unique?
It is shown how, among a class of generalized entropies, the Tsallis entropy
can uniquely be identified by the principles of thermodynamics, the concept of
stability and the axiomatic foundation.Comment: 21 pages. Contribution to a topical issue of Continuum Mechanics and
Thermodynamic
Bayesian approach to extreme-value statistics based on conditional maximum-entropy method
Recently, the conditional maximum-entropy method (abbreviated as C-MaxEnt)
has been proposed for selecting priors in Bayesian statistics in a very simple
way. Here, it is examined for extreme-value statistics. For the Weibull type as
an explicit example, it is shown how C-MaxEnt can give rise to a prior
satisfying Jeffreys' rule.Comment: 10 pages, 1 figure. To appear in J. Phys.: Conf. Se
Weak invariants of time-dependent quantum dissipative systems
The concept of weak invariant is introduced. Then, the weak invariants
associated with time-dependent quantum dissipative systems are discussed in the
context of master equations of the Lindblad type. In particular, with the help
of the su(1,1) Lie-algebraic structure, the weak invariant is explicitly
constructed for the quantum damped harmonic oscillator with the time-dependent
frequency and friction coefficient. This generalizes the Lewis-Riesenfeld
invariant to the case of nonunitary dynamics in the Markovian approximation.Comment: 15 pages, no figures. Published versio
Weak invariants, temporally-local equilibria, and isoenergetic processes described by the Lindblad equation
The concept of weak invariants is examined in the thermodynamic context.
Discussions are made about the temporally-local equilibrium states, corrections
to them, and isoenergetic processes based on the quantum master equations of
the Lindblad type that admit time-dependent Hamiltonians as weak invariants.
The method for determining the correction presented here may be thought of as a
quantum-mechanical analog of the Chapman-Enskog expansion in nonequilibrium
classical statistical mechanics. Then, the theory is applied to the
time-dependent harmonic oscillator as a simple example, and the power output
and the work along an isoenergetic process are evaluated within the framework
of finite-time quantum thermodynamics.Comment: 16 pages, no figures. Published versio
- …