Gravitational Lensing by Phantom Black holes

TL;DR

This paper investigates how phantom scalar and electromagnetic fields influence gravitational lensing by black holes, revealing significant effects on image properties in the strong deflection regime.

Contribution

It introduces new black hole solutions with phantom fields and analyzes their impact on gravitational lensing, a novel aspect in the study of such exotic fields.

Findings

Phantom fields significantly alter the angular position of images.

Brightness and separation of relativistic images are affected by phantom fields.

Results demonstrate observable differences from standard black hole lensing.

Abstract

In some models dark energy is described by phantom scalar fields (scalar fields with "wrong" sign of the kinetic term in the lagrangian). In the current paper we study the effect of phantom scalar field and/or phantom electromagnetic field on gravitational lensing by black holes in the strong deflection regime. The black-hole solutions that we have studied have been obtained in the frame of the Einstein-(anti-)Maxwell-(anti-)dilaton theory. The obtained results show considerable effect of the phantom scalar and electromagnetic fields on the angular position, brightness and separation of the relativistic images.