Pith. Sign in

REVIEW

Anti-de Sitter Black Holes, Thermal Phase Transition and Holography in Higher Curvature Gravity

High Energy Physics - Theory · Submitted 21 Feb 2002 · 55 references

Pith's verdict: The Gauss-Bonnet half is solid and the Wald/first-law entropy check is genuinely useful; the (Riemann)² k=-1 transition is an extrapolation of a first-order expansion at coupling O(1), and the abstract misstates two of its own results.

T0 · AI review

How this review was made: An AI referee (selfhosted/deepseek-v4.1-flash) read the paper on November 13, 2026 and answered a fixed list of questions about it. T0 is the starting level every paper gets. The levels describe how deeply Pith has checked the paper, never the authors.

  1. T0 AI review An AI read the paper and answered a fixed list of questions.
  2. T1 Audit Automatic checks that the references and files the paper relies on exist and match.
  3. T2 Compute The paper's code or calculations re-run with the same results.
  4. T3 Formal statement The claims written out in a formal math language a computer can read.
  5. T4 Proof Those claims proved, and the proof checked by computer.

How Pith checks papers →

· 3 major objections · 5 minor · Ask about this paper · The compiled record · Read the full review →
Challenge this review Comment (0) Read on arXiv ↗
Cite ▾
arXiv IDhep-th/0202140 (version 3)
Pith IDEEA7EIRT, Pith's permanent record of this paper and its review
CitationIshwaree P. Neupane, Y. M. Cho. "Anti-de Sitter Black Holes, Thermal Phase Transition and Holography in Higher Curvature Gravity." arXiv:hep-th/0202140 (2002). https://pith.science/paper/EEA7EIRT
Cite this reviewBibTeX for Pith's review of this paper
Claim paper

Why Pith says this

Highlight any text to comment on it.

Referee report
The paper

The paper claims

The paper argues that higher-curvature terms can allow a Hawking-Page thermal phase transition for anti-de Sitter black holes with hyperbolic horizons, a case forbidden in Einstein gravity.

The reading

The paper asks whether the Hawking-Page thermal transition—normally a black-hole-to-thermal-AdS change seen only for positively curved horizons in Einstein gravity—can survive when the bulk action includes a Gauss-Bonnet term or a generic $(Riemann)^2$ term. Its central claim is yes: for a hyperbolic horizon ($k=-1$), the free energy can turn positive at small horizon radius and negative at large radius, so a thermal AdS phase can be preferred in a window even though Einstein gravity forbids such a transition. The payoff would be a thermal AdS/CFT setting with a non-spherical boundary, and a way to see finite-coupling ($1/N$) corrections in black-hole thermodynamics. The paper also checks entropy: for Gauss-Bonnet the first-law entropy matches the Wald Noether-charge formula exactly, while for $(Riemann)^2$ the two agree only approximately, becoming identical when $r_H$ is much larger than $L$. One internal caveat should be recorded: the abstract states $S_{BH} < S_H$ for $k=0$ and $k=-1$, whereas Section VI derives the opposite inequality $S_H < S_{BH}$ for $k=0$ and $k=1$.

What carries the argument

The argument is carried by the sign of the regularized Euclidean free energy, $F=I_E/beta$, measured relative to thermal AdS with $F=0$. The Hawking temperature comes from the periodicity of imaginary time, $T=(e^{2varphi})'|_{r_H}/4pi$, and a phase transition occurs when $F$ changes sign as $r_H$ varies: $F>0$ favors thermal AdS, $F<0$ favors the black hole. For Gauss-Bonnet the authors use the exact solution $e^{2varphi}=k+r^2/(2hatalpha)+epsilon r^2/(2hatalpha)[1-4hatalpha/ell^2(1-hatalpha/ell^2)+4hatalpha m/r^d]^{1/2}$ and derive $F$, $T$, and $S$; for $(Riemann)^2$ they use a first-order perturbative metric and free energy. Entropy is cross-checked with the Noether-charge formula $tilde S=(4pi/kappa_{d+1})int d^{d-1}xsqrt{h}[1+2alphakappa_{d+1}R(h)]$ for Gauss-Bonnet and its higher-curvature generalization for $(Riemann)^2$.

Extended reading notes

Core claim

The paper's central result is that higher-curvature interactions change the phase structure of anti-de Sitter black holes. In Einstein gravity only $k=1$ horizons show a Hawking-Page transition; with the Gauss-Bonnet combination the authors find an exact branch where the $k=-1$ free energy can be positive for a range of horizon radii and negative for large radii, opening a first-order transition between a small topological black hole and thermal AdS. In the $(Riemann)^2$ theory, treated perturbatively to first order in $hatgamma$, a spherical horizon can show the transition only when $hatgamma/L^2 < 1/42$, which the authors translate as $N>5$, while a hyperbolic horizon requires $hatgamma/L^2>1/2$, a large-coupling regime that does not give a physical bound on $N$. The paper also shows that the Gauss-Bonnet entropy from the first law coincides with the Wald entropy for an arbitrary cosmological term, and that the $(Riemann)^2$ entropy agrees with Wald's formula in the large-horizon limit.

Load-bearing premise

For the $(Riemann)^2$ half of the claim, the load-bearing premise is that the first-order perturbative free energy remains reliable in the regime where the hyperbolic free energy turns positive, even though that regime requires $hatgamma/L^2>1/2$, an $O(1)$ coupling outside the perturbative expansion.

Editorial extensions

If this is right

  • A $k=-1$ Hawking-Page transition would let thermal AdS/CFT be studied on a hyperbolic boundary, not only on $S^{d-1}times S^1$.
  • The $N>5$ threshold in $(Riemann)^2$ gravity makes the transition a finite-$N$ effect, so the free-energy density should carry subleading $1/N$ terms beyond the Einstein result.
  • If the Gauss-Bonnet entropy identity holds for arbitrary $Lambda$, the area law is replaced by a horizon-curvature correction fixed by the first law and Noether charge, not by the horizon area alone.
  • The brane-world translation gives FRW equations in which the induced matter is not radiation-like when $gammatilde=0$ is violated, so the holographic entropy comparison can be phrased as a bound on brane matter.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the hyperbolic transition survives at second order in $hatgamma$, it would be a clean finite-coupling test for a dual CFT on a hyperbolic boundary; a thermal CFT on $H^3times S^1$ should show a corresponding confinement-like jump.
  • The paper's $N>5$ condition is a statement about the sign of a coefficient in a $1/N$ expansion; comparing it with the known $N=2$ $Sp(N)$ free energy at weak coupling could turn the threshold into a quantitative check rather than a sign test.
  • The abstract/text entropy-inequality mismatch suggests recalculating $S_H-S_{BH}$ for all $k$; the sign may depend on whether one uses the horizon radius or the brane radius in the Hubble formula.
  • Because the $k=-1$ $(Riemann)^2$ window needs $hatgamma/L^2>1/2$, a natural extension is to solve the full theory numerically and see whether the window is an artifact of first-order truncation or a real strong-coupling phase.
Original abstract

We study anti-de Sitter black holes in the Einstein-Gauss-Bonnet and the generic R^2 gravity theories, evaluate different thermodynamic quantities, and also examine the possibilities of Hawking-Page type thermal phase transitions in these theories. In the Einstein theory, with a possible cosmological term, one observes a Hawking-Page phase transition only if the event horizon is a hypersurface of positive constant curvature (k=1). But, with the Gauss-Bonnet or/and the (Riemann)^2 interaction terms, there may occur a similar phase transition for a horizon of negative constant curvature (k=-1). We examine the finite coupling effects, and find that N>5 could trigger a Hawking-Page phase transition in the latter theory. For the Gauss-Bonnet black holes, one relates the entropy of the black hole to a variation of the geometric property of the horizon based on first law and Noether charge. With (Riemann)^2 term, however, we can do this only approximately, and the two results agree when, r_H>>L, the size of the horizon is much bigger than the AdS curvature scale. We establish some relations between bulk data associated with the AdS black hole and boundary data defined on the horizon of the AdS geometry. Following a heuristic approach, we estimate the difference between Hubble entropy {\cal S}_H and Bekenstein-Hawking entropy {\cal S}_{BH} with (Riemann)^2 term, which, for k=0 and k=-1, would imply {\cal S}_{BH}\leq {\cal S}_H.

The compiled record

The paper's own sentences, arranged, kept beside the review and separate from it. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 6,550 input tokens, $0.0003 reported.

What the abstract itself states, as probabilities: claims first 0.02 · states limitation 0.89 · human participants 0.01 · controlled comparison 0.25 · randomized assignment 0.01 · states quantitative result 0.84 · compares with prior results 0.82 · mentions code or data availability 0.01.

The abstract, sentence by sentence

arXiv listing abstract v3. Results and the main claim are underlined; .

We study anti-de Sitter black holes in the Einstein-Gauss-Bonnet and the generic R^2 gravity theories, evaluate different thermodynamic quantities, and also examine the possibilities of Hawking-Page type thermal phase transitions in these theories. In the Einstein theory, with a possible cosmological term, one observes a Hawking-Page phase transition only if the event horizon is a hypersurface of positive constant curvature (k=1). But, with the Gauss-Bonnet or/and the (Riemann)^2 interaction terms, there may occur a similar phase transition for a horizon of negative constant curvature (k=-1). We examine the finite coupling effects, and find that N>5 could trigger a Hawking-Page phase transition in the latter theory. For the Gauss-Bonnet black holes, one relates the entropy of the black hole to a variation of the geometric property of the horizon based on first law and Noether charge. With (Riemann)^2 term, however, we can do this only approximately, and the two results agree when, r_H>>L, the size of the horizon is much bigger than the AdS curvature scale. We establish some relations between bulk data associated with the AdS black hole and boundary data defined on the horizon of the AdS geometry. Following a heuristic approach, we estimate the difference between Hubble entropy {\cal S}_H and Bekenstein-Hawking entropy {\cal S}_{BH} with (Riemann)^2 term, which, for k=0 and k=-1, would imply {\cal S}_{BH}\leq {\cal S}_H.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 We study anti-de Sitter black holes in the Einstein-Gauss-Bonnet and the generic R^2 gravity theories, evaluate different thermodynamic quantities, and also examine the possibilities of Hawking-Page type thermal phase transitions in these theories. contribution 1.00 0.95 0.10 asserted 0.91
s1 In the Einstein theory, with a possible cosmological term, one observes a Hawking-Page phase transition only if the event horizon is a hypersurface of positive constant curvature (k=1). background 0.95 0.15 0.08 asserted 0.88
s2 But, with the Gauss-Bonnet or/and the (Riemann)^2 interaction terms, there may occur a similar phase transition for a horizon of negative constant curvature (k=-1). result 0.96 0.38 0.30 hedged possibility 1.00
s3 We examine the finite coupling effects, and find that N>5 could trigger a Hawking-Page phase transition in the latter theory. result 0.99 0.94 0.19 asserted 0.73
s4 For the Gauss-Bonnet black holes, one relates the entropy of the black hole to a variation of the geometric property of the horizon based on first law and Noether charge. contribution 0.48 0.76 0.06 asserted 1.00
s5 With (Riemann)^2 term, however, we can do this only approximately, and the two results agree when, r_H>>L, the size of the horizon is much bigger than the AdS curvature scale. limitation 0.76 0.92 0.07 asserted 0.80
s6 We establish some relations between bulk data associated with the AdS black hole and boundary data defined on the horizon of the AdS geometry. contribution 0.84 0.92 0.08 asserted 1.00
s7 Following a heuristic approach, we estimate the difference between Hubble entropy {\cal S}_H and Bekenstein-Hawking entropy {\cal S}_{BH} with (Riemann)^2 term, which, for k=0 and k=-1, would imply {\cal S}_{BH}\leq {\cal S}_H. result 0.72 0.91 0.14 hedged possibility 0.78

What kind of paper the classifier reports this is: theoretical result 1.00 · evidence from proof or derivation 0.99.

What was examined, and what was not

sources read
  • arXiv listing abstract v3
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

References
How the literature uses it

35 arXiv papers cite this in 49 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 28 sentences without a confident label

Builds on it 1 paper
Uses its method or tool 1 paper
Compares with it 2 papers
Cites it as background 17 papers

Discussion

Disagree with the review, or know something it missed? Leave a comment, highlight any passage above to comment on it, or challenge this review formally.