Related Experiment Video
Updated: Jul 6, 2025

Magnetically Induced Rotating Rayleigh-Taylor Instability
Published on: March 3, 2017
Entropy Bounds for Rotating AdS Black Holes
Masaya Amo1,2, Antonia M Frassino2, Robie A Hennigar2
1Center for Gravitational Physics and Quantum Information, Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.
We introduce new thermodynamic inequalities for anti-de Sitter (AdS) black holes, refining existing isoperimetric inequalities. These findings extend to black holes with non-spherical topologies, like AdS black rings.
Area of Science:
- Theoretical physics
- General relativity
- Black hole thermodynamics
Background:
- Black hole thermodynamics relates gravitational and thermodynamic properties.
- Isoperimetric inequalities provide geometric constraints on thermodynamic quantities.
- Asymptotically anti-de Sitter (AdS) spacetimes are crucial in theoretical physics, particularly in the AdS/CFT correspondence.
Purpose of the Study:
- To propose novel thermodynamic inequalities for stationary asymptotically anti-de Sitter (AdS) black holes.
- To incorporate the thermodynamic volume into these inequalities.
- To refine the reverse isoperimetric inequality in the context of AdS black holes.
Main Methods:
- Derivation of new thermodynamic inequalities.
- Application and testing of these inequalities on various analytical black hole solutions.
- Analysis of black holes with spherical and non-spherical horizon topologies.
Main Results:
- Proposed thermodynamic inequalities hold for stationary asymptotically AdS black holes.
- The inequalities incorporate thermodynamic volume and refine the reverse isoperimetric inequality.
- Evidence suggests validity for black holes with nonspherical horizon topology, including AdS black rings.
Conclusions:
- The novel thermodynamic inequalities are a significant advancement in understanding black hole thermodynamics.
- These inequalities offer a refined geometric perspective on black hole properties.
- The findings broaden the applicability of thermodynamic inequalities to diverse black hole solutions.
Related Concept Videos
Schwarzschild Radius and Event Horizon
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
Entropy and the Second Law of Thermodynamics
The relation between entropy and disorder can be illustrated with the example of the phase change of ice to water. In ice, the molecules are located at specific sites giving a solid state, whereas, in a liquid form, these molecules are much freer to move. The molecular arrangement has therefore become more randomized. Although the change in average...
Detection of Black Holes
Their closest cousins are neutron stars, which are composed almost entirely of neutrons packed against each other, making them extremely dense. A neutron star has the same mass as the Sun but its diameter is only a few kilometers. Therefore, the escape velocity from their surface is close to the speed of light.
Not until the 1960s, when the first neutron...
Gravitational Potential Energy for Extended Objects
Conservation of Angular Momentum: Application
Euler Equations of Motion

