Observational Signatures of Janis-Newman-Winicour Strongly Naked Singularity

2025/05/19 by Zhang, Zeqian
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #General Relativity and Quantum Cosmology (gr-qc)

paper · pdf · doi:10.48550/arxiv.2505.13214

openalex publication_date 2025/05/19 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

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.

Citations

• Distinguishing the Observational Signatures of Hot Spots Orbiting Reissner-Nordström Spacetime
• Observing naked singularities by the present and next-generation Event Horizon Telescope
• Interferometric Signatures of Black Holes with Multiple Photon Spheres
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• Observations of Orbiting Hot Spots around Naked Singularities
• Gravitational Lensing by Transparent Janis-Newman-Winicour Naked Singularities
• Gravitational Lensing by Born-Infeld Naked Singularities
• First Sagittarius A* Event Horizon Telescope Results. VI. Testing the Black Hole Metric
• Einstein-Maxwell-dilaton neutral black holes in strong magnetic fields: topological charge, shadows and lensing
• First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
• Timelike Geodesics in Naked Singularity and Black Hole Spacetimes II
• Observation of Gravitational Waves from a Binary Black Hole Merger

Related

• Gravitational Lensing by Transparent Janis-Newman-Winicour Naked Singularities
• Observations of Orbiting Hot Spots around Naked Singularities
• Retrolensing by a spherically symmetric naked singularity
• Probing the Shadow Image of the Sagittarius A* with Event Horizon Telescope
• New class of naked singularities and their observational signatures