On some novel features of the Kerr-Newman-NUT Spacetime

Abstract

In this work we have presented a special class of Kerr-Newman-NUT black hole, having its horizon located precisely at $r=2M$, for $Q^2=l^2-a^2$, where $M$, $l$, $a$ and $Q$ are respectively mass, NUT, rotation and electric charge parameters of the black hole. Clearly this choice radically alters the causal structure as there exists no Cauchy horizon indicating spacelike nature of the singularity when it exists. On the other hand, there is no curvature singularity for $l^2>a^2$, however it may have conical singularities. Furthermore there is no upper bound on specific rotation parameter $a/M$, which could exceed unity without risking destruction of the horizon. To bring out various discerning features of this special member of the Kerr-Newman-NUT family, we study timelike and null geodesics in the equatorial as well as off the equatorial plane, energy extraction through super-radiance and Penrose process, thermodynamical properties and also the quasi-periodic oscillations. It turns out that the black hole under study radiates less energy through the super-radiant modes and Penrose process than the other black holes in this family.

arXiv commentRevised version, 37 pages, 10 figures, 1 table

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• Understanding photon sphere and black hole shadow in dynamically evolving spacetimes
• Classifying topology of consistent thermodynamics of the four-dimensional neutral Lorentzian NUT-charged spacetimes
• Rotating black holes without ${\mathbb{Z}}_2$ symmetry and their shadow images
• Circular orbits in Kerr-Taub-NUT spacetime and their implications for accreting black holes and naked singularities
• Dynamics of Charged and Rotating NUT Black Holes in Rastall Gravity
• Dynamics and Fundamental Frequencies of Test Particles Orbiting Kerr-Newman-NUT-Kiselev Blacks Hole in Rastall Gravity
• Rotating traversable wormholes in Einstein-Maxwell theory
• Deformed conformal symmetry of Kerr-Newman-NUT-AdS black holes
• Multipole moments of compact objects with NUT charge: Theoretical and observational implications
• Maximal Efficiency of Collisional Penrose Process with Spinning Particle II
• Possible connection between the reflection symmetry and existence of equatorial circular orbit
• Magnetized Kerr-Newman-Taub-NUT spacetimes
• Strong cosmic censorship conjecture with NUT charge and conformal coupling
• Kerr-Sen-Taub-NUT spacetime and circular geodesics
• Curved accretion disks around rotating black holes without reflection symmetry
• The equatorial motion of the charged test particles in Kerr-Newman-Taub-NUT spacetime
• Magnetized Taub-NUT spacetime
• Electric/magnetic duality of dyonic Kerr-Newman-NUT-AdS spacetimes
• Rotating and charged Taub-NUT-(A)dS spacetimes on a 3-brane
• Pure Gauss-Bonnet NUT Black Hole Solution: I
• Consistent derivation of the Hawking effect for both non-extremal and extremal Kerr black holes
• An alternative to the Simon tensor
• Sgr A* Shadow Study with KTN Space Time and Investigation of NUT Charge Existence
• Investigating the existence of gravitomagnetic monopole in M87*
• Pure Gauss-Bonnet NUT black hole with and without non-central singularity