91 research outputs found
Remark on Immirzi Parameter, Torsion, and Discrete Symmetries
We point out that the new interaction of spinning particles with the torsion
tensor, discussed recently, is odd under charge conjugation and time reversal.
This explains rather unexpected symmetry properties of the induced effective
4-fermion interaction.Comment: 3 page
General triple charged black ring solution in supergravity
We present the general black ring solution in supergravity in 5
dimensions with three independent dipole and electric charges. This immediately
gives the general black ring solution in the minimal 5D supergravity as well.Comment: 10 page
Does Cosmological Term Influence Gravitational Lensing?
We analyze the bending of light by galaxies or clusters of galaxies in the
presence of the cosmological term. Going over to the Friedmann-Robertson-Walker
coordinates, used in fact for the description of actual observations, we
demonstrate that the cosmological constant does not influence practically the
lensing effect.Comment: 5 pages, 1 figur
Phase diagram for the Grover algorithm with static imperfections
We study effects of static inter-qubit interactions on the stability of the
Grover quantum search algorithm. Our numerical and analytical results show
existence of regular and chaotic phases depending on the imperfection strength
. The critical border between two phases drops
polynomially with the number of qubits as .
In the regular phase the algorithm remains robust
against imperfections showing the efficiency gain for
. In the chaotic phase
the algorithm is completely destroyed.Comment: 4 pages, 4 figs, research at http://www.quantware.ups-tlse.f
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