546 research outputs found
Scattering Cross Sections and Lorentz Violation
To date, a significant effort has been made to adddress the Lorentz violating
standard model in low-energy systems, but little is known about the
ramifications for high-energy cross sections. In this talk, I discuss the
modified Feynman rules that result when Lorentz violation is present and give
the results of an explicit calculation for electron-positron annihilation into
two photons.Comment: 9 pages, 1 figure, talk presented at the second meeting on CPT and
Lorentz Symmetry, Bloomington, Indiana, August 200
Covariant Photon Quantization in the SME
The Gupta Bleuler quantization procedure is applied to the SME photon sector.
A direct application of the method to the massless case fails due to an
unavoidable incompleteness in the polarization states. A mass term can be
included into the photon lagrangian to rescue the quantization procedure and
maintain covariance.Comment: Presented at the Sixth Meeting on CPT and Lorentz Symmetry,
Bloomington, Indiana, June 17-21, 201
Theoretical Overview of Lorentz and CPT Violation
In this talk, I discuss some recent theoretical progress concerning the
Lorentz- and CPT-violating extension of the standard model. The results
summarized include the development of an explicit connection between
noncommutative field theory and the standard model extension, placement of new
bounds in the photon sector, calculation of one-loop renormalization beta
functions in QED, and an analysis of field redefinitions.Comment: 9 pages, to appear in the proceedings for 31st Coral Gables
Conference, Ft. Lauderdale, Florid
Deformed Instantons
In this talk, instantons are discussed in the presence of Lorentz violation.
Conventional topological arguments are applied to classify the modified
solutions to the Yang-Mills equations according to the topological charge.
Explicit perturbations to the instantons are calculated in detail for the case
of unit topological charge.Comment: 6 pages, proceedings for CPT and Lorentz Symmetry, Bloomington, IN,
200
Nonrelativisitic Ideal Gasses and Lorentz Violations
We develop statistical mechanics for a nonrelativisitic ideal gas in the
presence of Lorentz violating background fields. The analysis is performed
using the Standard-Model Extension (SME). We derive the corresponding laws of
thermodynamics and find that, to lowest order in Lorentz violation, the scalar
thermodynamic variables are corrected by a rotationally invariant combination
of the Lorentz terms which can be interpreted in terms of a (frame dependent)
effective mass. We find that spin couplings can induce a temperature
independent polarization in the gas that is not present in the conventional
case.Comment: 6 pages, proceedings for CPT and Lorentz Symmetry, Bloomington, IN,
200
Vector Superfields and Lorentz Violation
We extend Lorentz-violating Supersymmetry models to include vector
superfields. The CPT-preserving model generalizes easily, while the obvious
attempt at generalizing the CPT-violating model meets serious obstructions.
Generalizations of the CPT-preserving but Lorentz-Violating model to higher
dimensions are also straightforward. Compactification is used to reduce the
six-dimensional theory to an Lorentz-violating theory in four
dimensions, while the ten-dimensional theory is used to produce an
Lorentz-violating theory. This may be useful in future
constructions involving Ads/CFT correspondence with Lorentz violation.Comment: 5 pages, submitted to Physical Review
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