Zobrazeno 1 - 10
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pro vyhledávání: '"Townsend, Paul A"'
Autor:
Russo, Jorge G., Townsend, Paul K.
For any causal nonlinear electrodynamics theory that is "self-dual" (electromagnetic $U(1)$-duality invariant), the Legendre-dual pair of Lagrangian and Hamiltonian densities $\{\mathcal{L},\mathcal{H}\}$ are constructed from functions $\{\ell,h\}$ o
Externí odkaz:
http://arxiv.org/abs/2407.02577
Autor:
Russo, Jorge G., Townsend, Paul K.
For the general theory of nonlinear electrodynamics (NLED), we prove that causality implies both the Dominant Energy Condition (DEC) and, surprisingly, the Strong Energy Condition (SEC). This has implications for gravitational applications, such as r
Externí odkaz:
http://arxiv.org/abs/2404.09994
Autor:
Russo, Jorge G., Townsend, Paul K.
Many theories of nonlinear electrodynamics (NLED) that have been proposed in physical contexts involving strong fields are causal for weak fields but acausal for strong fields. We show that for any such theory there is a unique causal and self-dual (
Externí odkaz:
http://arxiv.org/abs/2401.06707
Autor:
Russo, Jorge G., Townsend, Paul K.
Publikováno v:
SciPost Phys. 16, 124 (2024)
Born's original 1933 theory of nonlinear electrodynamics (in contrast to the later Born-Infeld theory) is acausal for strong fields. We explore the issue of strong-field causality violation in families of theories containing Born and/or Born-Infeld,
Externí odkaz:
http://arxiv.org/abs/2401.04167
Using Hamiltonian methods, we find six relativistic theories of nonlinear electrodynamics for which plane wave perturbations about a constant uniform background are not birefringent. All have the same conformal strong-field limit to Bialynicki-Birula
Externí odkaz:
http://arxiv.org/abs/2311.04278
The Hamiltonian formulation for nonlinear chiral 2-form electrodynamics in six-dimensional Minkowski spacetime is used to show that small-amplitude plane-wave perturbations of a generic uniform constant `magnetic' background exhibit trirefringence: a
Externí odkaz:
http://arxiv.org/abs/2303.11485
Autor:
Russo, Jorge G., Townsend, Paul K.
All solutions of the no-birefringence conditions for nonlinear electrodynamics are found. In addition to the known Born-Infeld and Plebanski cases, we find a ``reverse Born-Infeld'' case, which has a limit to Plebanski, and an ``extreme-Born-Infeld''
Externí odkaz:
http://arxiv.org/abs/2211.10689
Autor:
Mezincescu, Luca, Townsend, Paul K.
In the Hamiltonian formulation of chiral 2k-form electrodynamics, the 2k-form potential on the (4k+1)-space is defined up to the addition of either (i) a closed $2k$-form or (ii) an exact 2k-form, depending on the choice of chirality constraint. Case
Externí odkaz:
http://arxiv.org/abs/2204.09336
Autor:
Townsend, Paul K.
The 19th century Aether died with Special Relativity but was resurrected by General Relativity in the form of dark energy; a tensile material with tension equal to its energy density. Such a material is provided by the D-branes of string-theory; thes
Externí odkaz:
http://arxiv.org/abs/2108.07536
We give a prescription for N=1 supersymmetrization of any (four-dimensional) nonlinear electrodynamics theory with a Lagrangian density satisfying a convexity condition that we relate to semi-classical unitarity. We apply it to the one-parameter ModM
Externí odkaz:
http://arxiv.org/abs/2106.07547