4,919 research outputs found
An approach toward the successful supernova explosion by physics of unstable nuclei
We study the explosion mechanism of collapse-driven supernovae by numerical
simulations with a new nuclear EOS based on unstable nuclei. We report new
results of simulations of general relativistic hydrodynamics together with the
Boltzmann neutrino-transport in spherical symmetry. We adopt the new data set
of relativistic EOS and the conventional set of EOS (Lattimer-Swesty EOS) to
examine the influence on dynamics of core-collapse, bounce and shock
propagation. We follow the behavior of stalled shock more than 500 ms after the
bounce and compare the evolutions of supernova core.Comment: 4 pages, 2 figures, contribution to Nuclei in the Cosmos 8, to appear
in Nucl. Phys.
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
- …