Eva-Maria Hekkelman, Teun D. H. van Nuland, Jesse Reimann
{"title":"Power Counting in the Spectral Action Matrix Model","authors":"Eva-Maria Hekkelman, Teun D. H. van Nuland, Jesse Reimann","doi":"10.1007/s00220-026-05691-5","DOIUrl":"10.1007/s00220-026-05691-5","url":null,"abstract":"<div><p>We derive power counting formulas for ribbon graph amplitudes that were recently independently discovered in two contexts, namely as a generalization of the Kontsevich model, and as corresponding to a matrix model approach to the spectral action. The Feynman rules are based on divided difference functions of eigenvalues of an abstract Dirac operator. We obtain formulas for the order of divergence, depending on the spectral dimension <i>d</i>, the order of decay of the test function <i>f</i> of the spectral action, and the graph properties. Several consequences are discussed, such as the fact that all graphs with maximal order of divergence (at a given loop order and number of external vertices) are planar. To derive our main results we establish two-sided bounds for divided differences, and in particular generalize Hunter’s positivity theorem to a larger class of functions.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00220-026-05691-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Quivers with Involutions and Shifted Twisted Yangians via Coulomb Branches","authors":"Yaolong Shen, Changjian Su, Rui Xiong","doi":"10.1007/s00220-026-05770-7","DOIUrl":"10.1007/s00220-026-05770-7","url":null,"abstract":"<div><p>To a quiver with involution, we study the Coulomb branch of the 3d <span>({mathcal {N}} = 4)</span> involution-fixed part of the quiver gauge theory. We show that there is an algebra homomorphism from the corresponding shifted twisted Yangian to the quantized Coulomb branch algebra. This gives a new instance of 3D mirror symmetries.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Clustering Theorem for Bose–Hubbard Class Gibbs States","authors":"Xin-Hai Tong, Tomotaka Kuwahara, Zongping Gong","doi":"10.1007/s00220-026-05730-1","DOIUrl":"10.1007/s00220-026-05730-1","url":null,"abstract":"<div><p>We establish the exponential clustering of correlation functions for the high-temperature Gibbs states of Bose–Hubbard type models. To overcome the technical difficulties arising from the unboundedness of bosonic operators, we develop the interaction-picture cluster-expansion technique. This method also allows us to systematically bound the moments of the local particle number. This result provides an analytical justification for the low-boson-density condition frequently assumed in the study of bosonic many-body systems. As direct mathematical consequences of the clustering property, we derive a uniform upper bound on the specific heat density and establish a bosonic thermal area law with improved temperature dependence.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00220-026-05730-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Potential Hessian Ascent: The Sherrington–Kirkpatrick Model","authors":"David Jekel, Juspreet Singh Sandhu, Jonathan Shi","doi":"10.1007/s00220-026-05681-7","DOIUrl":"10.1007/s00220-026-05681-7","url":null,"abstract":"<div><p>We present the first iterative spectral algorithm to find near-optimal solutions for the Sherrington–Kirkpatrick model, which is a random quadratic objective over the discrete hypercube, resolving a conjecture of Subag [1]. The algorithm is a randomized <i>Hessian ascent</i> in the solid cube, with the objective modified by subtracting an instance-independent potential function [2, 3]. Using tools from free probability theory, we construct an approximate projector into the top eigenspaces of the Hessian, which serves as the covariance matrix for the random increments. With high probability, the iterates’ empirical distribution approximates the solution to the primal version of the Auffinger-Chen SDE [4]. The per-iterate change in the modified objective is bounded via a Taylor expansion, where the derivatives are controlled through Gaussian concentration bounds and smoothness properties of a semiconcave regularization of the Fenchel–Legendre dual to the Parisi PDE [5]. These results lay the groundwork for (possibly) demonstrating low-degree sum-of-squares certificates over high-entropy step distributions for a relaxed version of the Parisi formula [6, Open Question 1.8].</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The Worldsheet Skein D-module and Basic Curves on Lagrangian Fillings of the Hopf Link Conormal","authors":"Tobias Ekholm, Pietro Longhi, Lukas Nakamura","doi":"10.1007/s00220-026-05775-2","DOIUrl":"10.1007/s00220-026-05775-2","url":null,"abstract":"<div><p>HOMFLYPT polynomials of knots in the 3-sphere in symmetric representations satisfy recursion relations. Their geometric origin is holomorphic curves at infinity on knot conormals that determine a <i>D</i>-module with characteristic variety the Legendrian knot conormal augmention variety and with the recursion relations as operator polynomial generators [1, 2]. We consider skein lifts of recursions and <i>D</i>-modules corresponding to skein valued open curve counts [3] that encode HOMFLYPT polynomials colored by arbitrary partitions. We define a worldsheet skein module which is the universal target for skein curve counts and a corresponding <i>D</i>-module. We then consider the concrete example of the Legendrian conormal of the Hopf link. We show that the worldsheet skein <i>D</i>-module for the Hopf link conormal is generated by three operator polynomials that annihilate the skein valued partition function for any choice of Lagrangian filling and recursively determine it uniquely. We find Lagrangian fillings for any point in the augmentation variety and show that their skein valued partition functions admit quiver-like expansions where all holomorphic curves are generated by a small number of basic holomorphic disks and annuli and their multiple covers.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00220-026-05775-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Affinization of Shifted Quantum Affine (mathfrak {gl}_2)","authors":"B. Feigin, M. Jimbo, E. Mukhin","doi":"10.1007/s00220-026-05766-3","DOIUrl":"10.1007/s00220-026-05766-3","url":null,"abstract":"<div><p>We give a realization <span>(mathcal A_0)</span> of quantum toroidal algebra associated to <span>(mathfrak {gl}_2)</span> which can be viewed as an affinization of the Drinfeld new realization of quantum affine <span>(mathfrak {gl}_2)</span>. We use this realization to define an affinization <span>(mathcal A_N)</span>, <span>(Nin {mathbb {Z}})</span>, of shifted quantum affine <span>(mathfrak {gl}_2)</span>. We construct a large family of representations of dominantly shifted algebra <span>(mathcal A_N)</span>, <span>(N>0)</span>. The examples of representations with even positive <i>N</i> appear in the study of extensions of deformed <i>W</i>-algebras of type <span>(mathfrak {gl}(N+2|1))</span>.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Orbital Stability of Benjamin–Ono Multisolitons","authors":"Rana Badreddine, Rowan Killip, Monica Vişan","doi":"10.1007/s00220-026-05733-y","DOIUrl":"10.1007/s00220-026-05733-y","url":null,"abstract":"<div><p>We show that multisoliton solutions to the Benjamin–Ono equation are uniformly orbitally stable in <span>(H^s(mathbb {R}))</span> for every <span>(-tfrac{1}{2}<sle frac{1}{2})</span>. This improves the regularity required for stability up to the sharp well-posedness threshold; previous work (even on single solitons) had required <span>(sge frac{1}{2})</span>. One key ingredient in our argument is a new variational characterization of multisolitons. A second ingredient is the extension to low-regularity slowly-decaying solutions of the Wu identity on eigenfunctions of the Lax operator. This extension also allows us to clarify the spectral type of the Lax operator for such potentials, by precluding embedded eigenvalues.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Quasi-multiplicativity and Regularity for Metric Graph Gaussian Free Fields","authors":"Jian Ding, Zhenhao Cai","doi":"10.1007/s00220-026-05772-5","DOIUrl":"10.1007/s00220-026-05772-5","url":null,"abstract":"<div><p>We prove quasi-multiplicativity for critical level-sets of Gaussian free fields (GFF) on the metric graphs <span>(widetilde{mathbb {Z}}^d)</span> (<span>(dge 3)</span>). Specifically, we study the probability of connecting two general sets located on opposite sides of an annulus with inner and outer radii both of order <i>N</i>, where additional constraints are imposed on the distance of each set to the annulus. We show that for all <span>(d ge 3)</span> except the critical dimension <span>(d=6)</span>, this probability is of the same order as <span>(N^{(6-d)wedge 0})</span> (serving as a correction factor) times the product of the two probabilities of connecting each set to the closer boundary of this annulus. The analogue for <span>(d=6)</span> is also derived, although the upper and lower bounds differ by a divergent factor of <span>(N^{o(1)})</span>. Notably, it was conjectured by Basu and Sapozhnikov [3] that quasi-multiplicativity without correction factor holds for Bernoulli percolation on <span>(mathbb {Z}^d)</span> when <span>(3le d<6)</span> and fails when <span>(d>6)</span>. In high dimensions (i.e., <span>(d>6)</span>), taking into account the similarity between the metric graph GFF and Bernoulli percolation (which was proposed by Werner [19] and later partly confirmed by the authors (2024)), our result provides support to the conjecture that Bernoulli percolation exhibits quasi-multiplicativity with correction factor <span>(N^{6-d})</span>. A crucial application of quasi-multiplicativity is proving the existence of the incipient infinite cluster (IIC), which has been completed by Basu and Sapozhnikov [3] for Bernoulli percolation for <span>(3le d<6)</span>. Inspired by their work, in a companion paper, we also utilize quasi-multiplicativity to establish the IIC for metric graph GFFs, for all <span>(dge 3)</span> except the critical dimension 6.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00220-026-05772-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Giovanni Felder, David Kazhdan, Alexander Polishchuk
{"title":"Superperiods and Superstring Measure Near the Boundary of the Moduli Space of Supercurves","authors":"Giovanni Felder, David Kazhdan, Alexander Polishchuk","doi":"10.1007/s00220-026-05763-6","DOIUrl":"10.1007/s00220-026-05763-6","url":null,"abstract":"<div><p>We study the behavior of the superperiod map near the boundary of the moduli space of stable supercurves and prove that it is similar to the behavior of periods of classical curves. We consider two applications to the geometry of the moduli space of stable (resp., smooth) supercurves of genus 2, denoted as <span>(overline{{mathcal {S}}}_2)</span> (resp., <span>({mathcal {S}}_2)</span>). First, we characterize the canonical projection of <span>({mathcal {S}}_2)</span> in terms of its behavior near the boundary, proving in particular that <span>(overline{{mathcal {S}}}_2)</span> is not projected. Secondly, we combine the information on superperiods with the explicit calculation of genus 2 Mumford isomorphism, due to Witten, to study the expansion of the superstring measure for genus 2 near the boundary. We also present the proof, due to Deligne, of regularity of the superstring measure on <span>({mathcal {S}}_g)</span> for any genus.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amaury Freslon, Dimitris M. Gerontogiannis, Adam Skalski
{"title":"Quantum Isometry Groups of Log-Laplacians on Cuntz–Krieger Algebras","authors":"Amaury Freslon, Dimitris M. Gerontogiannis, Adam Skalski","doi":"10.1007/s00220-026-05756-5","DOIUrl":"10.1007/s00220-026-05756-5","url":null,"abstract":"<div><p>We compute the quantum isometry groups of Cuntz–Krieger algebras endowed with the spectral triples coming from the Ahlfors regular structure of the underlying topological Markov chain. This allows us to exhibit a new family of compact quantum groups, mixing features from quantum automorphism groups of graphs and easy quantum groups. Contrary to the classical isometry groups, whose actions on the Cuntz–Krieger algebras are never ergodic, the quantum isometry group acts ergodically in the case of the Cuntz algebra. This also leads to the construction of a (genuinely quantum) ergodic action of a compact matrix quantum group on the Cantor space.</p></div>","PeriodicalId":522,"journal":{"name":"Communications in Mathematical Physics","volume":"407 12","pages":""},"PeriodicalIF":2.9,"publicationDate":"2026-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00220-026-05756-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149310760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}