scholarly journals A simple derivation of supersymmetric extremal black-hole attractors

2011 ◽  
Vol 700 (3-4) ◽  
pp. 261-264 ◽  
Author(s):  
Tomás Ortín
Keyword(s):  
Black Hole ◽  
Extremal Black Hole ◽  
Simple Derivation ◽  
Black Hole Attractors

scholarly journals Supersymmetric black holes and Freudenthal duality

2017 ◽  
Vol 32 (19n20) ◽  
pp. 1750114 ◽  
Author(s):  
Alessio Marrani ◽  
Taniya Mandal ◽  
Prasanta K. Tripathy
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Critical Points ◽  
Black Hole Entropy ◽  
Extremal Black Hole ◽  
Representation Space ◽  
Black Hole Attractors

We study the effect of Freudenthal duality on supersymmetric extremal black hole attractors in [Formula: see text], [Formula: see text] ungauged supergravity. Freudenthal duality acts on the dyonic black hole charges as an anti-involution which keeps the black hole entropy and the critical points of the effective black hole potential invariant. We analyze its effect on the recently discovered distinct, mutually exclusive phases of axionic supersymmetric black holes, related to the existence of nontrivial involutory constant matrices. In particular, we consider a supersymmetric [Formula: see text] black hole and we explicitly Freudenthal-map it to a supersymmetric [Formula: see text] black hole. We thus show that the charge representation space of a supersymmetric [Formula: see text] black hole also contains mutually exclusive domains.

scholarly journals Kaluza-Klein State in Bekenstein-Hawking Entropy Cycles

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Thiago Prudêncio
Keyword(s):  
Black Hole ◽  
Extremal Black Hole ◽  
State Configuration ◽  
Kaluza Klein

A Kaluza-Klein state configuration in black-hole qubit correspondence (BHQC) is considered in cyclic cycles of its Bekenstein-Hawking entropy. After a sequence of Peccei-Quinn transformations on the Kaluza-Klein state in cyclic cycles alternating between large and small extremal black hole (EBH) configurations, we obtain the corresponding amount of variation in the initial Bekenstein-Hawking entropy in cyclic cycles. We consider different cases where the EBH state alternates between small and large states. We then demonstrate that the total Bekenstein-Hawking entropy increases in these processes.

scholarly journals The statistical mechanics of near-extremal black holes

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
Luca V. Iliesiu ◽  
Gustavo J. Turiaci
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Partition Function ◽  
Gauge Field ◽  
Dimensional Reduction ◽  
Degrees Of Freedom ◽  
Energy Scale ◽  
Fixed Charge ◽  
Extremal Black Hole ◽  
Extremal Black Holes

Abstract An important open question in black hole thermodynamics is about the existence of a “mass gap” between an extremal black hole and the lightest near-extremal state within a sector of fixed charge. In this paper, we reliably compute the partition function of Reissner-Nordström near-extremal black holes at temperature scales comparable to the conjectured gap. We find that the density of states at fixed charge does not exhibit a gap; rather, at the expected gap energy scale, we see a continuum of states. We compute the partition function in the canonical and grand canonical ensembles, keeping track of all the fields appearing through a dimensional reduction on S2 in the near-horizon region. Our calculation shows that the relevant degrees of freedom at low temperatures are those of 2d Jackiw-Teitelboim gravity coupled to the electromagnetic U(1) gauge field and to an SO(3) gauge field generated by the dimensional reduction.

scholarly journals Near extremal black hole entropy as entanglement entropy viaAdS2/CFT1

2008 ◽  
Vol 77 (6) ◽  
Author(s):  
Tatsuo Azeyanagi ◽  
Tatsuma Nishioka ◽  
Tadashi Takayanagi
Keyword(s):  
Black Hole ◽  
Entanglement Entropy ◽  
Black Hole Entropy ◽  
Extremal Black Hole

scholarly journals Black Hole Attractors in Extended Supergravity

2007 ◽  
Author(s):  
Sergio Ferrara ◽  
Alessio Marrani ◽  
Arttu Rajantie ◽  
Carlo Contaldi ◽  
Paul Dauncey ◽  
...  
Keyword(s):  
Black Hole ◽  
Black Hole Attractors

scholarly journals EXTREMAL BLACK HOLES AND ELEMENTARY STRING STATES

1995 ◽  
Vol 10 (28) ◽  
pp. 2081-2093 ◽  
Author(s):  
ASHOKE SEN
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Black Hole Entropy ◽  
Extremal Black Hole ◽  
Coupling Constant ◽  
Left Handed ◽  
Quantum Numbers ◽  
Independent Parameters ◽  
Elementary String ◽  
Extremal Black Holes

Some of the extremal black hole solutions in string theory have the same quantum numbers as the Bogomol’nyi saturated elementary string states. We explore the possibility that these black holes can be identified with elementary string excitations. It is shown that stringy effects could correct the Bekenstein-Hawking formula for the black hole entropy in such a way that it correctly reproduces the logarithm of the density of elementary string states. In particular, this entropy has the correct dependence on three independent parameters, the mass and the left-handed charge of the black hole, and the string coupling constant.

scholarly journals Non-extremal black hole microstates: fuzzballs of fire or fuzzballs of fuzz?

2012 ◽  
Vol 2012 (12) ◽  
Author(s):  
Iosif Bena ◽  
Andrea Puhm ◽  
Bert Vercnocke
Keyword(s):  
Black Hole ◽  
Extremal Black Hole

scholarly journals Islands and Page curves for evaporating black holes in JT gravity

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
Timothy J. Hollowood ◽  
S. Prem Kumar
Keyword(s):  
Black Hole ◽  
Thermal Equilibrium ◽  
Evaporation Rate ◽  
Analytical Description ◽  
Extremal Black Hole ◽  
Thermal Bath ◽  
Slow Evaporation ◽  
Extremal Surface ◽  
Relaxational Process ◽  
Entanglement Structure

Abstract The effect of a CFT shockwave on the entanglement structure of an eternal black hole in Jackiw-Teitelboim gravity, that is in thermal equilibrium with a thermal bath, is considered. The shockwave carries energy and entropy into the black hole and heats the black hole up leading to evaporation and the eventual recovery of equilibrium. We find an analytical description of the entire relaxational process within the semiclassical high temperature regime. If the shockwave is inserted around the Page time then several scenarios are possible depending on the parameters. The Page time can be delayed or hastened and there can be more than one transition. The final entropy saddle has a quantum extremal surface that generically starts inside the horizon but at some later time moves outside. In general, increased shockwave energy and slow evaporation rate favour the extremal surface to be inside the horizon. The shockwave also disrupts the scrambling properties of the black hole. The same analysis is then applied to a shockwave inserted into the extremal black hole with similar conclusions.

Sign in / Sign up

Export Citation Format

Share Document