arXiv subjects

Clémentine Dassy

Publications and source records attributed to Clémentine Dassy.

3 recordsLinked to original sources

arXiv2026

Light deflection in the gravimagnetic dipole spacetime

The gravimagnetic dipole is an asymptotically flat, stationary, axisymmetric vacuum solution to Einstein's General Relativity describing two non-extreme black holes with equal masses and opposite NUT charges connected by a Misner string. The string tension's can be set to zero by choosing the black hole separation accordingly, yielding a stable system of oppositely rotating black holes at a fixed distance. Numerical simulations of massless particle geodesics reveal gravitational lensing effects for extended sources at infinity on the equatorial plane or on the vertical axis.

gr-qc↗

arXiv2026

Velocity rotation curves in the gravimagnetic dipole spacetime

The gravimagnetic dipole spacetime consists of two counter-rotating black holes of equal mass connected by a Misner string. For a particular distance in between them, the string is tensionless with the black holes at equilibrium with each other. The geodesics of relativistic massive, or massless particles are considered, leading to the identification of circular rotation trajectories. The velocities of these trajectories are computed.

gr-qc↗

arXiv2021

Deformed Hopfion-Rañada Knots in ModMax Electrodynamics

Source-free so-called ModMax theories of nonlinear electrodynamics in the four dimensional Minkowski spacetime vacuum are the only possible continuous deformations -- and as a function of a single real and positive parameter -- of source-free Maxwell linear electrodynamics in the same vacuum, which preserve all the same Poincaré and conformal spacetime symmetries as well as the continuous duality invariance of Maxwell's theory. Null field configurations of the latter however, including null electromagnetic knots, are singular for the Lagrangian formulation of any spacetime Poincaré and conformal invariant theory of nonlinear electrodynamics. In particular null hopfion-Rañada knots are a distinguished and fascinating class on their own of topologically nontrivial solutions to Maxwell's equations. This work addresses the fate of these configurations within ModMax theories. A doubled class of ModMax deformed hopfion-Rañada knots is thereby identified, each of which coalescing back in a continuous fashion to the original hopfion-Rañada knot when the nonlinear deformation parameter is turned off.

physics.gen-ph↗