Buscar
Mostrando ítems 1-10 de 29
Time evolution of the Wigner function in discrete quantum phase space for a soluble quasi-spin model
(Iop Publishing Ltd, 2000-04-14)
The discrete phase space approach to quantum mechanics of degrees of freedom without classical counterparts is applied to the many-fermions/quasi-spin Lipkin model. The Wi:ner function is written for some chosen states ...
SAXS and UV-Vis combined to Quick-XAFS monitoring of ZnO nanoparticles formation and growth
(Taylor & Francis Ltd, 2011-01-01)
Time-resolved X-ray absorption-fine structure (Quick-XAFS) and UV-Vis absorption spectroscopies were combined for monitoring simultaneously the time evolution of Zn-based species and ZnO quantum dot (Qdot) formation and ...
Coupled Bose-Einstein condensate: Collapse for attractive interaction
(2001-04-01)
The collapse of trapped Boson-Einstein condensate (BEC) of atoms in states 1 and 2 was studied. When the interaction among the atoms in state i was attractive the component i of the condensate experienced collapse. When ...
Tunneling time through a barrier using the local value of a time operator
(American Physical Soc, 2001-08-01)
A time for a quantum particle to traverse a barrier is obtained for stationary states by setting the local value of a time operator equal to a constant. This time operator, called the tempus operator because it is distinct ...
Critical number of atoms for attractive Bose-Einstein condensates with cylindrically symmetrical traps
(2001-11-01)
The critical number of atoms for Bose-Einstein condensates with cylindrically symmetrical traps were calculated. The time evolution of the condensate was also studied at changing ground state. A conjecture on higher-order ...
Numerical study of the coupled time-dependent Gross-Pitaevskii equation: Application to Bose-Einstein condensation
(2001-05-01)
The Bose-Einstein condensate of several types of trapped bosons at ultralow temperature was described using the coupled time dependent Gross-Pitaevskii equation. Both the stationary and time evolution problems were analyzed ...
Quantum discrete phase space dynamics and its continuous limit
(Iop Publishing Ltd, 2000-02-11)
The main aspects of a discrete phase space formalism are presented and the discrete dynamical bracket, suitable for the description of time evolution in finite-dimensional spaces, is discussed. A set of operator bases is ...
Dynamics in discrete phase spaces and time interval operators
(Elsevier B.V., 1999-03-01)
The von Neumann-Liouville time evolution equation is represented in a discrete quantum phase space. The mapped Liouville operator and the corresponding Wigner function are explicitly written for the problem of a magnetic ...
From quantum to classical instability in relativistic stars
(Amer Physical Soc, 2015)
Renormalized coordinate approach to the thermalization process
(Amer Physical Soc, 2009-03-01)
We consider a particle in the harmonic approximation coupled linearly to an environment modeled by an infinite set of harmonic oscillators. The system (particle environment) is considered in a cavity at thermal equilibrium. ...