491 research outputs found
On Lorentz violation in scattering at finite temperature
Small violation of Lorentz and CPT symmetries may emerge in models unifying
gravity with other forces of nature. An extension of the standard model with
all possible terms that violate Lorentz and CPT symmetries are included. Here a
CPT-even non-minimal coupling term is added to the covariant derivative. This
leads to a new interaction term that breaks the Lorentz symmetry. Our main
objective is to calculate the cross section for the
scattering in order to
investigate any violation of Lorentz and/or CPT symmetry at finite temperature.
Thermo Field Dynamics formalism is used to consider finite temperature effects.Comment: 12 pages, 1 figure, accepted for publication in PL
Forms on Vector Bundles Over Hyperbolic Manifolds and the Conformal Anomaly
We study gauge theories based on abelian forms on real compact hyperbolic
manifolds. An explicit formula for the conformal anomaly corresponding to
skew--symmetric tensor fields is obtained, by using zeta--function
regularization and the trace tensor kernel formula. Explicit exact and
numerical values of the anomaly for forms of order up to in spaces of
dimension up to are then calculated.Comment: 13 pages, 2 table
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