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Two-fluid evolving Lorentzian wormholes
We investigate the evolution of a family of wormholes sustained by two matter
components: one with homogeneous and isotropic properties and another
inhomogeneous and anisotropic . The rate of expansion of these
evolving wormholes is only determined by the isotropic and homogeneous matter
component . Particularly, we consider a family of exact two-fluid
evolving wormholes expanding with constant velocity and satisfying the dominant
and the strong energy conditions in the whole spacetime. In general, for the
case of vanishing isotropic fluid and cosmological constant
the space expands with constant velocity, and for and the rate of expansion is determined by the cosmological constant. The
considered here two-fluid evolving wormholes are a generalization of single
fluid models discussed in previous works of the present authors [Phys.\ Rev.\ D
{\bf 78}, 104006 (2008); Phys.\ Rev.\ D {\bf 79}, 024005 (2009)].Comment: 8 pages, to be published in Phys. Rev
Diffraction in time of a confined particle and its Bohmian paths
Diffraction in time of a particle confined in a box which its walls are
removed suddenly at is studied. The solution of the time-dependent
Schr\"{o}dinger equation is discussed analytically and numerically for various
initial wavefunctions. In each case Bohmian trajectories of the particles are
computed and also the mean arrival time at a given location is studied as a
function of the initial state.Comment: 8 pages, 6 figure
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