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...

Full description

Saved in:
Bibliographic Details
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.
Format: Article
Language:English
Subjects:
Accretion disks
Circularity
Cosmology
Curvature
Gravitation
Mathematical analysis
Naked singularities
Schwarzschild metric
Signatures
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.85.104031