2,410 research outputs found
Tutorial on Scale and Conformal Symmetries in Diverse Dimensions
We review the relation between scale and conformal symmetries in various
models and dimensions. We present a dimensional reduction from relativistic to
non-relativistic conformal dynamics.Comment: Addendum added that includes author S.-H. Ho; Sodano Fest, Perugia,
Italy, January 201
Covariant Coordinate Transformations on Noncommutative Space
We show how to define gauge-covariant coordinate transformations on a
noncommuting space. The construction uses the Seiberg-Witten equation and
generalizes similar results for commuting coordinates.Comment: 11 pages, LaTeX; email correspondence to [email protected]
Lorentz Violation in a Diffeomorphism-Invariant Theory
In a diffeomorphism invariant theory, symmetry breaking may be a mask for
coordinate choice.Comment: 8 pages, no figures. Submitted to the CPT'07 Proceeding
4-Dimensional Einstein Theory Extended by a 3-Dimensional Chern-Simons Term
When 4-dimensional general relativity is extended by a 3-dimensional
gravitational Chern-Simons term an apparent violation of diffeormorphism
invariance is extinguished by the dynamical equations of motion for the
modified theory. The physical predictions of this recently proposed model show
little evidence of symmetry breaking, but require the vanishing of the
Pontryagin density.Comment: 11 pages, 0 figure
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