319 research outputs found
Some remarks on Bell's Inequality tests
We emphasize the difficulties of an experiment that can definitely
discriminate between local realistic hidden variables theories and quantum
mechanics using the Bell CHSH inequalities and a real measurement apparatus. In
particular we analyze some examples in which the noise in real instruments can
alter the experimental results, and the nontrivial problem to find a real "fair
sample" of particles to test the inequalities.Comment: 12 pages, Latex, 2 figures, to be published in Europhysics Letter
A dynamical symmetry breaking model in Weyl space
The dynamical process following the breaking of Weyl geometry to Riemannian
geometry is considered by studying the motion of de Sitter bubbles in a Weyl
vacuum. The bubbles are given in terms of an exact, spherically symmetric thin
shell solution to the Einstein equations in a Weyl-Dirac theory with a
time-dependent scalar field of the form beta = f(t)/r. The dynamical solutions
obtained lead to a number of possible applications. An important feature of the
thin shell model is the manner in which beta provides a connection between the
interior and exterior geometries since information about the exterior geometry
is contained in the boundary conditions for beta.Comment: 18 pages, RevTex, to be published in J. Math. Phy
Maximal Acceleration Effects in Kerr Space
We consider a model in which accelerated particles experience line--elements
with maximal acceleration corrections that are introduced by means of
successive approximations. It is shown that approximations higher than the
first need not be considered. The method is then applied to the Kerr metric.
The effective field experienced by accelerated test particles contains
corrections that vanish in the limit , but otherwise affect the
behaviour of matter greatly. The corrections generate potential barriers that
are external to the horizon and are impervious to classical particles.Comment: 16 pages, 10 figures, to appear on Phys. Lett.
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