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arxiv: 2606.26546 · v1 · pith:7GTFYFKBnew · submitted 2026-06-25 · ✦ hep-th

Holographic s- and p-wave superconductors from the 4D regularization of Einstein-Lovelock theory

Soodeh Zarepour , Ali Dehghani This is my paper

Pith reviewed 2026-06-26 03:34 UTC · model grok-4.3

classification ✦ hep-th
keywords holographic superconductorsEinstein-Lovelock gravity4D regularizations-wavep-wavehigher curvature correctionsoptical conductivitycritical temperature
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0 comments X

The pith

In regularized 4D Einstein-Lovelock gravity, higher curvature order K raises the critical temperature of both s-wave and p-wave holographic superconductors, especially for negative coupling alpha.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper shows that the 4D regularization of Einstein-Lovelock gravity, with couplings tuned to allow consistent black-brane solutions up to arbitrary curvature order K, produces holographic models of (2+1)-dimensional superconductors. Scalar and vector condensates form at higher critical temperatures as K grows, and negative values of the Lovelock coupling alpha further raise Tc while positive alpha lowers it relative to Einstein gravity. Optical conductivity calculations reveal that the gap frequency and the ratio omega_g over Tc also shift with alpha and K, moving away from Einstein-gravity universality and producing a larger gap scale. These effects appear in both s-wave and p-wave cases, though the p-wave system responds more strongly to the choice of bulk-field mass prescription.

Core claim

The regularized four-dimensional Einstein-Lovelock theory with finely tuned couplings yields exact black-brane geometries whose curvature corrections up to order K modify the holographic phase structure: critical temperatures increase with K and are enhanced by negative alpha, the gap in conductivity grows, and both s-wave and p-wave condensates become more sensitive to the gravitational parameters than in pure Einstein gravity.

What carries the argument

Exact black-brane solutions of the 4D-regularized Einstein-Lovelock gravity with tuned coupling alpha and maximal curvature order K, which serve as the bulk geometry for the holographic dual of the superconductors.

If this is right

  • Increasing the maximal curvature order K produces higher-Tc superconducting phases for both s-wave and p-wave systems.
  • Negative alpha strengthens condensation and raises Tc while positive alpha weakens it relative to Einstein gravity.
  • The optical gap frequency and the ratio omega_g/Tc grow with K and depend on the sign of alpha.
  • The p-wave condensate is more sensitive than the s-wave condensate to the choice of bulk mass prescription.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The same regularization could be applied to other holographic models, such as those for Fermi surfaces or quantum critical points, to test whether higher K systematically alters transport coefficients.
  • The observed enhancement of Tc with negative alpha suggests a concrete way to engineer effective higher-curvature duals that mimic stronger coupling in condensed-matter systems.
  • If the mass-prescription dependence persists in other observables, it would indicate that the choice of bulk field mass is not merely technical but selects distinct regimes of the dual theory.

Load-bearing premise

The 4D regularization procedure with finely tuned Lovelock couplings remains valid and yields consistent black-brane solutions at every order K.

What would settle it

An explicit calculation of the black-brane metric or the condensate equations showing that Tc stops rising or the geometry becomes singular for K greater than 2 would falsify the central claim.

Figures

Figures reproduced from arXiv: 2606.26546 by Ali Dehghani, Soodeh Zarepour.

Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p008_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: , which all the condensation curves satisfy the BF bound (3.8). This figure exhibits the dimensionless quantity hO+i 1/∆+ /Tc versus the scale invariant temperature T /Tc for various values of the fine-tuned Lovelock coupling constant α and different K’s in the allowed range with the mass of the scalar field fixed by m2L 2 = −2. As seen, for all cases, the charged scalar operator hO+i has condensed for tem… view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p012_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p014_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5 [PITH_FULL_IMAGE:figures/full_fig_p015_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6 [PITH_FULL_IMAGE:figures/full_fig_p016_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7 [PITH_FULL_IMAGE:figures/full_fig_p017_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8 [PITH_FULL_IMAGE:figures/full_fig_p018_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIG. 9 [PITH_FULL_IMAGE:figures/full_fig_p019_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: FIG. 10 [PITH_FULL_IMAGE:figures/full_fig_p019_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: FIG. 11 [PITH_FULL_IMAGE:figures/full_fig_p021_11.png] view at source ↗
Figure 12
Figure 12. Figure 12: FIG. 12 [PITH_FULL_IMAGE:figures/full_fig_p022_12.png] view at source ↗
Figure 13
Figure 13. Figure 13: FIG. 13 [PITH_FULL_IMAGE:figures/full_fig_p025_13.png] view at source ↗
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Figure 14. Figure 14: FIG. 14 [PITH_FULL_IMAGE:figures/full_fig_p026_14.png] view at source ↗
Figure 15
Figure 15. Figure 15: FIG. 15 [PITH_FULL_IMAGE:figures/full_fig_p027_15.png] view at source ↗
Figure 16
Figure 16. Figure 16: FIG. 16 [PITH_FULL_IMAGE:figures/full_fig_p027_16.png] view at source ↗
Figure 17
Figure 17. Figure 17: FIG. 17 [PITH_FULL_IMAGE:figures/full_fig_p028_17.png] view at source ↗
Figure 18
Figure 18. Figure 18: FIG. 18 [PITH_FULL_IMAGE:figures/full_fig_p029_18.png] view at source ↗
Figure 19
Figure 19. Figure 19: FIG. 19 [PITH_FULL_IMAGE:figures/full_fig_p029_19.png] view at source ↗
Figure 20
Figure 20. Figure 20: FIG. 20 [PITH_FULL_IMAGE:figures/full_fig_p030_20.png] view at source ↗
Figure 21
Figure 21. Figure 21: FIG. 21 [PITH_FULL_IMAGE:figures/full_fig_p031_21.png] view at source ↗
Figure 22
Figure 22. Figure 22: FIG. 22 [PITH_FULL_IMAGE:figures/full_fig_p031_22.png] view at source ↗
Figure 23
Figure 23. Figure 23: FIG. 23 [PITH_FULL_IMAGE:figures/full_fig_p032_23.png] view at source ↗
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Figure 24. Figure 24: FIG. 24 [PITH_FULL_IMAGE:figures/full_fig_p033_24.png] view at source ↗
read the original abstract

We investigate holographically dual descriptions of $(2+1)$-dimensional s-wave and p-wave superconductors in the framework of regularized four-dimensional Einstein-Lovelock gravity theories, incorporating higher curvature corrections beyond the Gauss-Bonnet sector. We first implement the 4D regularization of Einstein-Lovelock gravity with finely tuned coupling constants to include corrections up to any $K$th order in curvature. The bulk geometry is constructed from exact black-brane solutions characterized by the fine-tuned Lovelock coupling $\alpha$ and the highest power of curvature in the Lagrangian K. We then analyze the condensation of scalar and vector operators dual to minimally coupled matter fields, focusing on two bulk-field mass prescriptions, which significantly affect the superconducting phase. Our results demonstrate that higher curvature terms significantly modify the phase structure of both s-wave and p-wave systems and enhance the sensitivity of the condensates and critical temperatures to the gravitational couplings. In both cases, the critical temperature generally increases with the maximal curvature order K, leading to higher-$T_c$ phases compared to Einstein gravity, particularly for negative $\alpha$. The coupling $\alpha$ effectively governs the strength of higher curvature interactions in the bulk: positive $\alpha$ suppresses condensation and lowers $T_c$, whereas negative $\alpha$ enhances superconducting order and promotes higher-$T_c$ phases relative to Einstein gravity. We further study the optical conductivity and find that both the gap frequency and the ratio $\omega_g/T_c$ exhibit a strong dependence on $\alpha$ and $K$, deviating from the universal Einstein-gravity result. Higher curvature effects enhance the superconducting gap scale. Notably, the p-wave system shows a stronger sensitivity to the mass-fixing prescription compared to the s-wave case.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

1 major / 2 minor

Summary. The manuscript studies holographic duals of (2+1)-dimensional s-wave and p-wave superconductors in 4D-regularized Einstein-Lovelock gravity. Exact black-brane backgrounds are constructed with a single tuned coupling α and arbitrary curvature order K; scalar and vector matter fields are then solved on these backgrounds for two mass prescriptions. The authors report that Tc generally rises with K (especially for negative α), that positive α suppresses condensation while negative α enhances it relative to Einstein gravity, and that both the gap frequency ωg and the ratio ωg/Tc deviate from the Einstein-gravity value, with stronger sensitivity in the p-wave case.

Significance. If the regularized solutions are consistent, the work supplies a controlled setting in which higher-curvature corrections can be varied continuously via K and α, allowing quantitative statements about how such terms shift critical temperatures and optical gaps in holographic superconductors. The use of exact black-brane metrics and the comparison of two mass prescriptions are concrete strengths.

major comments (1)
  1. [§2–3] The central construction rests on the claim (§2 and §3) that the 4D-regularized Einstein-Lovelock equations admit exact black-brane solutions for arbitrary K with a single parameter α. No explicit substitution of the metric ansatz into the regularized field equations is shown for K ≥ 3; given known consistency issues with the regularization procedure beyond Gauss-Bonnet order, this verification is load-bearing for all subsequent results on condensation and conductivity.
minor comments (2)
  1. The two mass prescriptions are introduced without a clear statement of which bulk mass corresponds to which boundary operator dimension; a short table would improve readability.
  2. Figure captions for the conductivity plots should explicitly state the values of α and K used in each panel.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for their careful review and for recognizing the potential of our work in providing a controlled setting for higher-curvature effects in holographic superconductors. We address the major comment regarding the verification of the black-brane solutions point by point below.

read point-by-point responses

  1. Referee: [§2–3] The central construction rests on the claim (§2 and §3) that the 4D-regularized Einstein-Lovelock equations admit exact black-brane solutions for arbitrary K with a single parameter α. No explicit substitution of the metric ansatz into the regularized field equations is shown for K ≥ 3; given known consistency issues with the regularization procedure beyond Gauss-Bonnet order, this verification is load-bearing for all subsequent results on condensation and conductivity.

    Authors: We agree that an explicit verification would strengthen the presentation. The 4D regularization of Einstein-Lovelock gravity is performed by tuning the Lovelock couplings in a specific way that allows the theory to be well-defined in four dimensions while retaining higher-order curvature terms. For the black-brane metric ansatz, which is a solution in the higher-dimensional Lovelock theory, the tuning ensures that the same metric satisfies the regularized 4D equations for any K with a fixed α. This is because the contributions from higher orders factorize in a manner that the equation of motion reduces to the same algebraic relation for α independent of K. Although this substitution was not explicitly displayed for K ≥ 3 in the original manuscript, it follows directly from the regularization procedure described in §2. We will include the explicit substitution in an appendix in the revised version. On the consistency issues beyond Gauss-Bonnet, we note that our construction uses the standard regularization that has been applied in the literature for higher-order terms, and for the vacuum black-brane solutions, the equations are satisfied without encountering the known pathologies, as verified by the existence of the solutions we employ. revision: yes

Circularity Check

0 steps flagged

No significant circularity; results from direct EOM solutions

full rationale

The derivation proceeds by first implementing the 4D regularization to obtain black-brane metrics parameterized by α and K, then solving the coupled bulk equations of motion for the matter fields (scalar for s-wave, vector for p-wave) to extract condensation curves, critical temperatures, and optical conductivity. These quantities are outputs of the numerical integration for given input parameters rather than being fitted to data or defined in terms of themselves. No self-definitional relations, fitted-input predictions, or load-bearing self-citations appear in the abstract or described chain; the dependence of Tc on K and α emerges from the dynamics of the regularized theory. The skeptic concern targets consistency of the regularization itself, which is an external validity question rather than a circularity within the derivation.

Axiom & Free-Parameter Ledger

2 free parameters · 2 axioms · 0 invented entities

The results depend on the validity of the holographic principle in this modified gravity and the specific regularization chosen, with α and K serving as free parameters that are varied to explore the phase structure.

free parameters (2)
  • α
    Lovelock coupling constant that controls the strength of higher curvature interactions.
  • K
    Integer specifying the highest order of curvature corrections included in the Lagrangian.
axioms (2)
  • domain assumption Holographic duality applies to the regularized Einstein-Lovelock gravity theory.
    This allows interpreting the bulk black brane solutions as dual to boundary superconductors.
  • ad hoc to paper The 4D regularization procedure with finely tuned couplings is consistent and yields valid gravity theories.
    The paper relies on this to include higher order terms beyond Gauss-Bonnet.

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Reference graph

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