Circular geodesics and accretion disks in the Janis-Newman-Winicour and gamma metric spacetimes

We study here circular timelike geodesics in the Janis-Newman-Winicour and Gamma metric spacetimes which contain a strong curvature naked singularity and reduce to the Schwarzschild metric for a specific value of one of the parameters. We show that for both the metrics the range of allowed parameter...

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Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2012-05, Vol.85 (10), Article 104031
Main Authors: Chowdhury, Anirban N., Patil, Mandar, Malafarina, Daniele, Joshi, Pankaj S.
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Language:English
Subjects:
Accretion disks
Circularity
Cosmology
Curvature
Gravitation
Mathematical analysis
Naked singularities
Schwarzschild metric
Signatures
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description We study here circular timelike geodesics in the Janis-Newman-Winicour and Gamma metric spacetimes which contain a strong curvature naked singularity and reduce to the Schwarzschild metric for a specific value of one of the parameters. We show that for both the metrics the range of allowed parameters can be divided into three regimes where structure of the circular geodesics is qualitatively different. It follows that the properties of the accretion disks around such naked singularities can be significantly different from those of disks around black holes. This adds to previous studies showing that if naked singularities exist in nature, their observational signature would be significantly different from that of the black hole.
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects Accretion disks
Circularity
Cosmology
Curvature
Gravitation
Mathematical analysis
Naked singularities
Schwarzschild metric
Signatures
title Circular geodesics and accretion disks in the Janis-Newman-Winicour and gamma metric spacetimes
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