2,579 research outputs found
Local cosmic string and C-field
We investigate a local cosmic string with a phenomenological energy momentum
tensor as prescribed by Vilenkin, in presence of C-field . The solutions of
full nonlinear Einstein's equations for exterior and interior regions of such a
string are presented.Comment: 7 page
Entanglement cost of two-qubit orthogonal measurements
The "entanglement cost" of a bipartite measurement is the amount of shared
entanglement two participants need to use up in order to carry out the given
measurement by means of local operations and classical communication. Here we
numerically investigate the entanglement cost of generic orthogonal
measurements on two qubits. Our results strongly suggest that for almost all
measurements of this kind, the entanglement cost is strictly greater than the
average entanglement of the eigenstates associated with the measurements,
implying that the nonseparability of a two-qubit orthogonal measurement is
generically distinct from the nonseparability of its eigenstates.Comment: Latex, 4 pages, minor change
Non-Abelian Gauged Chiral Boson with a Generalized Faddevian Regularization
We consider non-Abelian gauged version of chiral boson with a generalized
Faddeevian regularization. It is a second class constrained theory. We quantize
the theory and analyze the phase space. It is shown that in spite of the lack
of manifest Lorentz invariance in the action, it has a consistent and Poincare'
invariant phase space structure.Comment: 10 pages latex fil
Chiral QED in Terms of Chiral Boson with a Generalized Fadeevian Regularization
Chiral QED with a generalized Fadeevian regularization is considered.
Imposing a chiral constraint a gauged version of Floranini-Jackiw lagrangian is
constructed. The imposition of the chiral constarint has spoiled t he
manifestly Lorentz covariance of the theory. The phase space structure for this
theory has been det ermined. It is found that spectrum changes drastically but
it is Lorentz invariant. Chiral fermion di sappears from the spectra and the
photon anquire mass as well. Poincare algebra has been calculated to show
physicial Lorentz invariance explicitely.Comment: 11 page
Thin Domain Walls in Lyra Geometry
This paper studies thin domain walls within the frame work of Lyra Geometry.
We have considered two models. First one is the thin domain wall with
negligible pressures perpendicular and transverse direction to the wall and
secondly, we take a particular type of thin domain wall where the pressure in
the perpendicular direction is negligible but transverse pressures are existed.
It is shown that the thin domain walls have no particle horizon and the
gravitational force due to them is attractive.Comment: 8 pages, typos are corrected, published Astrophysics and Space
Sciences 305, 337 (2006
Thin shell wormhole due to dyadosphere of a charged black hole
To explain Gamma Ray Bursts, Ruffini argued that the event horizon of a
charged black hole is surrounded by a special region called, the Dyadosphere
where electric field exceeds the critical value for pair
production. In the present work, we construct a thin shell wormhole by
performing a thought surgery between two dadospheres. Several physical
properties of this thin shell wormhole have been analyzed.Comment: 10 pages, 2 figures. Accepted in Mod.Phys.Lett.
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