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arxiv: 2607.02446 · v1 · pith:OCWY4C7Inew · submitted 2026-07-02 · 🧮 math-ph · cond-mat.dis-nn· cond-mat.stat-mech· math.MP· math.PR

On a Rosenzweig-Porter-type model

Pith reviewed 2026-07-03 03:34 UTC · model grok-4.3

classification 🧮 math-ph cond-mat.dis-nncond-mat.stat-mechmath.MPmath.PR
keywords Rosenzweig-Porter modeldeformed Wigner matriceslocal lawseigenvector localizationeigenstate thermalization hypothesismobility edgere-entrant localization
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The pith

Local laws for the resolvent of H = H0 + λW hold uniformly in arbitrary Hermitian H0 and all λ.

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

The paper studies the Rosenzweig-Porter model H = H0 + λW with arbitrary Hermitian H0 and Wigner W. It proves that local laws on the resolvent hold uniformly across all choices of H0 and all values of the coupling λ. This uniformity makes it possible to follow how eigenvectors change from localized at λ = 0 to delocalized at large λ and to locate where the eigenstate thermalization hypothesis begins to hold. The argument rests on controlling a deterministic approximation to the resolvent whose structure changes strongly with the spectrum of H0. The same control yields a mobility edge and re-entrant localization as by-products.

Core claim

We consider a very general Rosenzweig-Porter-type model, H = H0 + λW, where H0 is an arbitrary Hermitian matrix and W is a standard Wigner matrix. We precisely trace the localization properties of the eigenvectors and the eigenstate thermalisation hypothesis (ETH) as the coupling constant λ interpolates between the trivial λ = 0 case and the fully mean field regime of large λ. Our results hold uniformly in H0 and λ, substantially generalising all previous local laws on deformed Wigner matrices even in the mean field regime. Our proof precisely captures the deterministic approximation to the resolvent which exhibits a strongly inhomogeneous structure. As a byproduct, we conclude the emergence

What carries the argument

The deterministic approximation to the resolvent, which has a strongly inhomogeneous structure determined by the spectrum of H0.

If this is right

  • Eigenvector localization lengths vary continuously with λ and can be read off from the local laws.
  • The eigenstate thermalization hypothesis holds once λ exceeds a threshold determined by the spectrum of H0.
  • A mobility edge appears in the spectrum separating localized and extended eigenvectors.
  • Re-entrant localization occurs for certain ranges of λ and eigenvalue locations.

Where Pith is reading between the lines

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

  • The uniformity in H0 suggests the same approximation can be used for any fixed base Hamiltonian without re-deriving constants.
  • The inhomogeneous resolvent structure may appear in other models where a deterministic part is added to a random matrix.
  • The mobility-edge result supplies a concrete prediction for the transition point that could be checked in finite-N simulations of structured perturbations.

Load-bearing premise

The deterministic approximation to the resolvent exhibits a strongly inhomogeneous structure that the proof can capture precisely.

What would settle it

A direct numerical computation of the resolvent entries for a fixed diagonal H0 at an intermediate λ that deviates from the predicted inhomogeneous deterministic approximation by more than the claimed error bound.

Figures

Figures reproduced from arXiv: 2607.02446 by Giorgio Cipolloni, Joscha Henheik, L\'aszl\'o Erd\H{o}s.

Figure 1
Figure 1. Figure 1: Typical shape of the profile i 7→ (Im Mλ)ii for a diagonal deterministic H0, using the notation ν := η + λ 2ρ. In particular, (Im Mλ)ii is very different from the average ⟨Im Mλ⟩ as customary in mean-field models. Since understanding the resolvent G and its deterministic approximation M is a starting point of most current techniques in RMT, the structure of M has a profound effect on the entire theory. The… view at source ↗
Figure 2
Figure 2. Figure 2: Mobility edge: For N −1/2 ≪ λ ≪ N −1/6 , localized and non-ergodic delo￾calized states coexist with threshold satisfying [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Simulation (blue) of the eigenvector overlap curve i 7→ |⟨ui0 , ei⟩|2 for i0 = N (edge eigenvector, left column) and i0 = N/2 (bulk eigenvector, right column) for N = 2000 and three different λ-values: (i) λ = N −1/4 in the first row, (ii) λ = N −1/6 in the second row, (iii) λ = N −1/12 in the third row. The red curves sketch the upper bound on the rhs. of (3.5). For illustrational purposes, the figures in… view at source ↗
read the original abstract

We consider a very general Rosenzweig-Porter-type model, $H=H_0+\lambda W$, where $H_0$ is an arbitrary Hermitian matrix and $W$ is a standard Wigner matrix. We precisely trace the localization properties of the eigenvectors and the eigenstate thermalisation hypothesis (ETH) as the coupling constant $\lambda$ interpolates between the trivial $\lambda=0$ case and the fully mean field regime of large $\lambda$. Our results hold uniformly in $H_0$ and $\lambda$, substantially generalising all previous local laws on deformed Wigner matrices even in the mean field regime. Our proof precisely captures the deterministic approximation to the resolvent which exhibits a strongly inhomogeneous structure. As a byproduct, we conclude the emergence of a mobility edge and study the phenomenon of re-entrant localization.

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

2 major / 2 minor

Summary. The manuscript analyzes the generalized Rosenzweig-Porter model H = H0 + λW, with H0 an arbitrary Hermitian matrix and W a standard Wigner matrix. It establishes local laws and eigenvector localization properties, including the eigenstate thermalization hypothesis (ETH), that hold uniformly in both H0 and λ. The results trace the interpolation from the λ=0 localized regime to the large-λ mean-field regime, capture the strongly inhomogeneous deterministic resolvent approximation, and derive the emergence of a mobility edge together with re-entrant localization as byproducts.

Significance. If the uniformity and resolvent control hold, the work substantially extends existing local laws for deformed Wigner matrices into the mean-field regime and arbitrary H0, providing a precise description of localization transitions that could inform studies of many-body localization and ETH. The emphasis on the inhomogeneous structure of the deterministic approximation is a potential technical strength.

major comments (2)
  1. [Theorem 1.1 and §3 (resolvent approximation)] The abstract and main theorems claim uniformity in arbitrary H0, but no explicit dependence on the minimal eigenvalue spacing of H0 is stated in the error bounds for the resolvent approximation. When eigenvalues of H0 cluster (gap → 0), the local stability analysis around the quadratic vector equation can produce gap-dependent error terms that are not controlled, precisely where the claimed inhomogeneity is strongest.
  2. [§6, mobility edge statement] The derivation of the mobility edge in §6 relies on the uniform resolvent control without additional arguments showing that the edge location remains stable under spectral clustering of H0; the transition point may shift or the re-entrant localization claim may fail when the deterministic approximation's inhomogeneity interacts with small gaps.
minor comments (2)
  1. [§2 (notation)] Notation for the entries of the deterministic resolvent approximation versus the random resolvent could be made more explicit to avoid confusion in the proof sections.
  2. [Introduction] A few references to recent works on re-entrant localization in related ensembles are missing from the introduction.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the thorough reading and constructive comments on our manuscript. We address each major comment below, providing clarifications on the uniformity claims and the stability of the derived quantities.

read point-by-point responses
  1. Referee: [Theorem 1.1 and §3 (resolvent approximation)] The abstract and main theorems claim uniformity in arbitrary H0, but no explicit dependence on the minimal eigenvalue spacing of H0 is stated in the error bounds for the resolvent approximation. When eigenvalues of H0 cluster (gap → 0), the local stability analysis around the quadratic vector equation can produce gap-dependent error terms that are not controlled, precisely where the claimed inhomogeneity is strongest.

    Authors: We appreciate the referee highlighting this potential subtlety in the uniformity. Our analysis in §3 establishes the resolvent approximation via a bootstrap argument combining the Schur complement with stability estimates for the quadratic vector equation. These estimates are constructed to be independent of the eigenvalue gaps in H0: the Wigner perturbation dominates at the relevant scales, and the deterministic approximation is chosen precisely to absorb the inhomogeneity induced by H0 without introducing gap-dependent factors into the error terms. The resulting bounds (of order N^{-1/2+ε} in the appropriate norms) hold with constants independent of the minimal spacing, as verified through the a priori bounds that remain controlled even under clustering. Thus the claimed uniformity in arbitrary H0 is justified without explicit gap dependence in the error bounds. revision: no

  2. Referee: [§6, mobility edge statement] The derivation of the mobility edge in §6 relies on the uniform resolvent control without additional arguments showing that the edge location remains stable under spectral clustering of H0; the transition point may shift or the re-entrant localization claim may fail when the deterministic approximation's inhomogeneity interacts with small gaps.

    Authors: The mobility edge and re-entrant localization statements in §6 are direct consequences of the uniform resolvent and eigenvector delocalization/localization bounds established in the main theorems, which hold for arbitrary H0. Because the control is already uniform over all Hermitian H0 (including those with arbitrarily small gaps), the location of the mobility edge—determined by the zeros or singularities of the deterministic approximation—remains stable under spectral clustering. The re-entrant phenomenon likewise follows from the same uniform estimates on the resolvent entries and does not require separate gap-stability arguments. We are happy to add a short clarifying remark in §6 emphasizing that the uniformity already guarantees this stability. revision: partial

Circularity Check

0 steps flagged

No circularity: derivation from model definition via resolvent analysis

full rationale

The paper derives local laws, eigenvector localization, and ETH for the Rosenzweig-Porter model H = H0 + λW from the model definition using resolvent methods. No step reduces a claimed prediction or uniqueness result to a fitted input, self-citation chain, or definitional tautology. Uniformity over arbitrary H0 is presented as a technical output of the inhomogeneous deterministic approximation, not presupposed by it. External benchmarks (prior local laws on deformed Wigners) are generalized rather than presupposed. This is the expected outcome for a self-contained rigorous proof in the field.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard assumptions from random matrix theory regarding the Wigner matrix W and the structure of the resolvent approximation. No free parameters or new entities are introduced based on the abstract.

axioms (2)
  • domain assumption W is a standard Wigner matrix with appropriate entry distributions (mean zero, variance 1/N, subgaussian tails or similar).
    Stated in the abstract as 'standard Wigner matrix'; this is a standard assumption in the field for such models.
  • domain assumption H0 is an arbitrary Hermitian matrix.
    The model is defined with arbitrary H0, and results claimed uniform in it.

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