Observational Signatures of Janis-Newman-Winicour Strongly Naked Singularity

TL;DR

This study investigates the unique observational signatures of accretion onto Janis-Newman-Winicour naked singularities, highlighting reflection effects and paired images that could distinguish them from black holes in future observations.

Contribution

It introduces the reflection-induced imaging signatures and lensing patterns specific to JNW naked singularities, which differ from black hole signatures.

Findings

Reflection effects produce paired images in lensing.

Accretion disk brightness profiles are significantly altered.

Distinct inclination-dependent observational signatures are identified.

Abstract

This paper explores the unique observational signatures of accretion onto a Janis-Newman-Winicour (JNW) strongly naked singularity, particularly in the absence of a photon sphere. The surrounding spacetime of such a singularity exhibits pronounced reflective properties, causing light rays traveling in its vicinity to undergo reflection and produce paired imaging trajectories in both accretion disk and hot spot models. Our simulations reveal that this reflection effect generates additional images in the gravitational lensing patterns and significantly alters the temporal brightness profiles of the lensed images. These reflection-induced paired images, together with their inclination-dependent behavior, offer distinct observational signatures that could potentially distinguish a JNW strongly naked singularity from a black hole based on future high-resolution observations.