Shadowless rapidly rotating yet not ultraspinning Kerr- AdS4 and Kerr-Newman- AdS4 black holes

@article{Wu2021ShadowlessRR,
  title={Shadowless rapidly rotating yet not ultraspinning Kerr-
AdS4
 and Kerr-Newman-
AdS4
 black holes},
  author={Di Wu and Puxun Wu and Hongwei Yu},
  journal={Physical Review D},
  year={2021}
}
We find that the Kerr-(Newman)-AdS4 black hole will be shadowless if its rotation parameter is larger than a critical value and the shadowless-ness may be related to the appearance of the null hypersurface caustics (NHC) both inside the Cauchy horizon and outside the event horizon for the black hole with the rotation parameter beyond the critical value. Our studies also further confirm that whether an ultraspinning black hole is superentropic or not is unrelated to the existence of the NHC… 

Figures from this paper

References

SHOWING 1-10 OF 56 REFERENCES

Ultraspinning limits and super-entropic black holes

A bstractBy employing the new ultraspinning limit we construct novel classes of black holes with non-compact event horizons and finite horizon area and study their thermo-dynamics. Our ultraspinning

Are ultraspinning Kerr-Sen- AdS4 black holes always superentropic?

We study thermodynamics of the four-dimensional Kerr-Sen-AdS black hole and its ultra-spinning counterpart, and verify that both black holes fullfil the first law and Bekenstein-Smarr mass formulae

Extremal vanishing horizon Kerr-AdS black holes at ultraspinning limit

A bstractBy utilizing the ultraspinning limit we generate a new class of extremal vanishing horizon (EVH) black holes in odd dimensions (d ≥ 5). Starting from the general multi-spinning Kerr-AdS

Null hypersurface caustics for high-dimensional superentropic black holes

A black hole is superentropic if it violates the reverse isoperimetric inequality. Recently, some studies have indicated that some four dimensional superentropic black holes have the null

Null hypersurfaces in Kerr–Newman–AdS black hole and super-entropic black hole spacetimes

A three-dimensional light-like foliation of a spacetime geometry is one particular way of studying its light cone structure and has important applications in numerical relativity. In this paper, we

Rotation and the AdS/CFT correspondence

In asymptotically flat space a rotating black hole cannot be in thermodynamic equilibrium because the thermal radiation would have to be co-rotating faster than light far from the black hole. However

Rotating black holes in 4d gauged supergravity

A bstractWe present new results towards the construction of the most general black hole solutions in four-dimensional Fayet-Iliopoulos gauged supergravities. In these theories black holes can be

Super-entropic black holes and the Kerr-CFT correspondence

We demonstrate that Kerr-CFT duality can be extended to super-entropic black holes, which have non-compact horizons with finite area. We demonstrate that this duality is robust insofar as the

Null hypersurfaces in Kerr–(A)dS spacetimes

For many purposes, a three-dimensional foliation of spacetime is more advantageous to understanding its light cone structure. We derive the equations describing such foliations for the Kerr geometry

Entropy Inequality Violations from Ultraspinning Black Holes.

A new class of rotating anti-de Sitter black hole solutions with noncompact event horizons of finite area in any dimension is constructed and their thermodynamics are studied to suggest more stringent conditions under which this conjecture may hold.
...