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2 results on '"Michael D. Seifert"'

1. A monopole solution in a Lorentz-violating field theory

Author

Michael D. Seifert

Subjects
Physics, High Energy Physics - Theory, Field (physics), Lorentz transformation, Magnetic monopole, General Physics and Astronomy, FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Lorentz covariance, General Relativity and Quantum Cosmology, Tensor field, Topological defect, Theoretical physics, symbols.namesake, High Energy Physics - Theory (hep-th), Quantum electrodynamics, Antisymmetric tensor, symbols, Field theory (psychology)
Abstract

I present a topological defect solution that arises in a theory where Lorentz symmetry is spontaneously broken by a rank-two antisymmetric tensor field, and I discuss its observational signatures., 4 pages, 1 figure

Published
2010

2. Lorentz-violating gravity and the bootstrap procedure.

Author

Michael D Seifert

Subjects
*TENSOR fields, *VECTOR fields, *PERTURBATION theory, *GRAVITY, *BUMBLEBEES
Abstract

In conventional gravitational physics, the so-called ‘bootstrap procedure’ can be used to extrapolate from a linear model of a rank-2 tensor to a full non-linear theory of gravity (i.e. general relativity) via a coupling to the stress-energy of the model. In this work, I extend this procedure to a ‘Lorentz-violating’ gravitational model, in which the linear tensor field and the matter fields ‘see’ different metrics due to a coupling between the tensor field and a background vector field. The resulting model can be thought of as a generalized Proca theory with a non-minimal coupling to conventional matter. It has a similar linearized limit to the better-known ‘bumblebee model’, but differs at higher orders in perturbation theory. Its effects are unobservable in FRW spacetimes, but are expected to be important in anisotropic cosmological spacetimes. [ABSTRACT FROM AUTHOR]

Published
2020
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