Ray trajectories for a spinning cosmic string and a manifestation of self-cloaking

Abstract

A study of ray trajectories was undertaken for the Tamm medium which represents the spacetime of a cosmic spinning string, under the geometric-optics approximation. Our numerical studies revealed that: (i) rays never cross the string's boundary; (ii) the Tamm medium supports evanescent waves in regions of phase space that correspond to those regions of the string's spacetime which could support closed timelike curves; and (iii) a spinning string can be slightly visible while a non-spinning string is almost perfectly invisible.

References in corpus (9)

• Cosmic strings
• Three-dimensional metamaterials with an ultra-high effective refractive index over broad bandwidth
• Towards a metamaterial simulation of a spinning cosmic string
• Delay-bandwidth and delay-loss limitations for cloaking of large objects
• Casimir Energy, Holographic Dark Energy and Electromagnetic Metamaterial Mimicking de Sitter
• Gravitation and Electromagnetic Wave Propagation with Negative Phase Velocity
• Towards gravitationally assisted negative refraction of light by vacuum
• Effect of charge on negative-phase-velocity propagation of electromagnetic waves in the ergosphere of a rotating black hole
• Unwrapping Closed Timelike Curves

Cited by in corpus (8)

• Analogue Gravity
• Anisotropic metamaterial as an analogue of a black hole
• Wave diffraction by a cosmic string
• Ray trajectories for Alcubierre spacetime
• Exact results on analogue gravity in optical Plebanski-Tamm media
• Exact results in a punctured neighborhood of a strong curvature singularity
• Optical analogues to the Kerr-Newman black hole
• Can Light Cross a Singularity? Exact Solutions from Analogue Gravity