TL;DR
This paper analyzes circular geodesic orbits, inertial forces, and accretion structures in NUT space-time, proposing potential observational distinctions from Schwarzschild or Kerr black holes.
Contribution
It provides a detailed study of circular orbits, von Zeipel cylinders, and thick accretion tori specifically in NUT space-time, extending known models to this unique geometry.
Findings
Location of ISCO and marginally bound orbits determined
Relation of von Zeipel cylinders to inertial forces analyzed
Generalization of thick accretion tori to NUT space-time
Abstract
We consider circular motion in the NUT (Newman-Unti-Tamburino) space-time. Among other things, we determine the location of circular time-like geodesic orbits, in particular of the innermost stable circular orbit (ISCO) and of the marginally bound circular orbit. Moreover, we discuss the von Zeipel cylinders with respect to the stationary observers and with respect to the Zero Angular Momentum Observers (ZAMOs). We also investigate the relation of von Zeipel cylinders to inertial forces, in particular in the ultra-relativistic limit. Finally, we generalise the construction of thick accretion tori ("Polish doughnuts") which are well known on the Schwarzschild or Kerr background to the case of the NUT metric. We argue that, in principle, a NUT source could be distinguished from a Schwarzschild or Kerr source by observing the features of circular matter flows in its neighbourhood.
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