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Integrable Systems of Finite Type from F-Cohomological Field Theories Without Unit 无单位F-同调场论中的有限型可积系统
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-09-09 DOI: 10.1007/s11040-023-09463-8
Alexandr Buryak, Danil Gubarevich
{"title":"Integrable Systems of Finite Type from F-Cohomological Field Theories Without Unit","authors":"Alexandr Buryak,&nbsp;Danil Gubarevich","doi":"10.1007/s11040-023-09463-8","DOIUrl":"10.1007/s11040-023-09463-8","url":null,"abstract":"<div><p>One of many manifestations of a deep relation between the topology of the moduli spaces of algebraic curves and the theory of integrable systems is a recent construction of Arsie, Lorenzoni, Rossi, and the first author associating an integrable system of evolutionary PDEs to an F-cohomological field theory (F-CohFT), which is a collection of cohomology classes on the moduli spaces of curves satisfying certain natural splitting properties. Typically, these PDEs have an infinite expansion in the dispersive parameter, which happens because they involve contributions from the moduli spaces of curves of arbitrarily large genus. In this paper, for each rank <span>(Nge 2)</span>, we present a family of F-CohFTs without unit, for which the equations of the associated integrable system have a finite expansion in the dispersive parameter. For <span>(N=2)</span>, we explicitly compute the primary flows of this integrable system.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43705195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Some Non-periodic p-Adic Generalized Gibbs Measures for the Ising Model on a Cayley Tree of Order k k阶Cayley树上Ising模型的一些非周期p进广义Gibbs测度
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-08-31 DOI: 10.1007/s11040-023-09465-6
Muzaffar Rahmatullaev, Akbarkhuja Tukhtabaev
{"title":"Some Non-periodic p-Adic Generalized Gibbs Measures for the Ising Model on a Cayley Tree of Order k","authors":"Muzaffar Rahmatullaev,&nbsp;Akbarkhuja Tukhtabaev","doi":"10.1007/s11040-023-09465-6","DOIUrl":"10.1007/s11040-023-09465-6","url":null,"abstract":"<div><p>In the present paper, we consider a <i>p</i>-adic Ising model on a Cayley tree. The existence of non-periodic <i>p</i>-adic generalized Gibbs measures of this model is investigated. In particular, we construct <i>p</i>-adic analogue of the Bleher–Ganikhodjaev construction and generalize some constructive methods. Moreover, the boundedness of obtained measures are established, which yields the occurrence of a phase transition.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42039520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Relative Entropy of Fermion Excitation States on the CAR Algebra CAR代数上费米子激发态的相对熵
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-08-30 DOI: 10.1007/s11040-023-09464-7
Stefano Galanda, Albert Much, Rainer Verch
{"title":"Relative Entropy of Fermion Excitation States on the CAR Algebra","authors":"Stefano Galanda,&nbsp;Albert Much,&nbsp;Rainer Verch","doi":"10.1007/s11040-023-09464-7","DOIUrl":"10.1007/s11040-023-09464-7","url":null,"abstract":"<div><p>The relative entropy of certain states on the algebra of canonical anticommutation relations (CAR) is studied in the present work. The CAR algebra is used to describe fermionic degrees of freedom in quantum mechanics and quantum field theory. The states for which the relative entropy is investigated are multi-excitation states (similar to multi-particle states) with respect to KMS states defined with respect to a time-evolution induced by a unitary dynamical group on the one-particle Hilbert space of the CAR algebra. If the KMS state is quasifree, the relative entropy of multi-excitation states can be explicitly calculated in terms of 2-point functions, which are defined entirely by the one-particle Hilbert space defining the CAR algebra and the Hamilton operator of the dynamical group on the one-particle Hilbert space. This applies also in the case that the one-particle Hilbert space Hamilton operator has a continuous spectrum so that the relative entropy of multi-excitation states cannot be defined in terms of von Neumann entropies. The results obtained here for the relative entropy of multi-excitation states on the CAR algebra can be viewed as counterparts of results for the relative entropy of coherent states on the algebra of canonical commutation relations which have appeared recently. It turns out to be useful to employ the setting of a self-dual CAR algebra introduced by Araki.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11040-023-09464-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47859155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Elliptic Solutions of the Toda Lattice with Constraint of Type B and Deformed Ruijsenaars–Schneider System 带约束的B型和变形rujsenaars - schneider系统Toda格的椭圆解
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-08-03 DOI: 10.1007/s11040-023-09462-9
V. Prokofev, A. Zabrodin
{"title":"Elliptic Solutions of the Toda Lattice with Constraint of Type B and Deformed Ruijsenaars–Schneider System","authors":"V. Prokofev,&nbsp;A. Zabrodin","doi":"10.1007/s11040-023-09462-9","DOIUrl":"10.1007/s11040-023-09462-9","url":null,"abstract":"<div><p>We study elliptic solutions of the recently introduced Toda lattice with the constraint of type B and derive equations of motion for their poles. The dynamics of poles is given by the deformed Ruijsenaars–Schneider system. We find its commutation representation in the form of the Manakov triple and study properties of the spectral curve. By studying more general elliptic solutions (elliptic families), we also suggest an extension of the deformed Ruijsenaars–Schneider system to a field theory.\u0000</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45235756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Discrete Field Theory: Symmetries and Conservation Laws 离散场论：对称性与守恒定律
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-08-03 DOI: 10.1007/s11040-023-09459-4
M. Skopenkov
{"title":"Discrete Field Theory: Symmetries and Conservation Laws","authors":"M. Skopenkov","doi":"10.1007/s11040-023-09459-4","DOIUrl":"10.1007/s11040-023-09459-4","url":null,"abstract":"<div><p>We present a general algorithm constructing a discretization of a classical field theory from a Lagrangian. We prove a new discrete Noether theorem relating symmetries to conservation laws and an energy conservation theorem not based on any symmetry. This gives exact conservation laws for several theories, e.g., lattice electrodynamics and gauge theory. In particular, we construct a conserved discrete energy–momentum tensor, approximating the continuum one at least for free fields. The theory is stated in topological terms, such as coboundary and products of cochains.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46824337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Extensions and Generalizations of Lattice Gelfand–Dickey Hierarchy 晶格Gelfand-Dickey层次的扩展与推广
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-07-29 DOI: 10.1007/s11040-023-09461-w
Lixiang Zhang, Chuanzhong Li
{"title":"Extensions and Generalizations of Lattice Gelfand–Dickey Hierarchy","authors":"Lixiang Zhang,&nbsp;Chuanzhong Li","doi":"10.1007/s11040-023-09461-w","DOIUrl":"10.1007/s11040-023-09461-w","url":null,"abstract":"<div><p>In this paper, for the extended lattice Gelfand–Dickey hierarchy, we construct its <i>n</i>-fold Darboux transformation and additional flows. And we prove that these flows are actually symmetries of the extended lattice Gelfand–Dickey hierarchy. Further, we show how the additional flows act on the tau function. On this basis, we generalize the extended lattice Gelfand–Dickey hierarchy to the multicomponent and noncommutative versions, and give the Lax equations, Sato equations, zero-curvature equations and other equivalent expressions of these versions. Moreover, we investigate their Darboux transformations and additional symmetries.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43266335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
On the Global Minimum of the Energy–Momentum Relation for the Polaron 极化子能量-动量关系的全局极小值
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-07-26 DOI: 10.1007/s11040-023-09460-x
Jonas Lampart, David Mitrouskas, Krzysztof Myśliwy
{"title":"On the Global Minimum of the Energy–Momentum Relation for the Polaron","authors":"Jonas Lampart,&nbsp;David Mitrouskas,&nbsp;Krzysztof Myśliwy","doi":"10.1007/s11040-023-09460-x","DOIUrl":"10.1007/s11040-023-09460-x","url":null,"abstract":"<div><p>For the Fröhlich model of the large polaron, we prove that the ground state energy as a function of the total momentum has a unique global minimum at momentum zero. This implies the non-existence of a ground state of the translation invariant Fröhlich Hamiltonian and thus excludes the possibility of a localization transition at finite coupling.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11040-023-09460-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47232248","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Existence and Uniqueness of Solutions to Backward 2D and 3D Stochastic Convective Brinkman–Forchheimer Equations Forced by Lévy Noise lsamvy噪声强迫下的倒向二维和三维随机对流Brinkman-Forchheimer方程解的存在唯一性
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-07-03 DOI: 10.1007/s11040-023-09458-5
Manil T. Mohan
{"title":"Existence and Uniqueness of Solutions to Backward 2D and 3D Stochastic Convective Brinkman–Forchheimer Equations Forced by Lévy Noise","authors":"Manil T. Mohan","doi":"10.1007/s11040-023-09458-5","DOIUrl":"10.1007/s11040-023-09458-5","url":null,"abstract":"<div><p>The two- and three-dimensional incompressible backward stochastic convective Brinkman–Forchheimer (BSCBF) equations on a torus driven by Lévy noise are considered in this paper. A-priori estimates for adapted solutions of the finite-dimensional approximation of 2D and 3D BSCBF equations are obtained. For a given terminal data, the existence and uniqueness of pathwise adapted strong solutions is proved by using a standard Galerkin (or spectral) approximation technique and exploiting the monotonicity arguments. We also establish the continuity of the adapted solutions with respect to the terminal data. The above results are obtained for the absorption exponent <span>(rin [1,infty ))</span> for <span>(d=2)</span> and <span>(rin [3,infty ))</span> for <span>(d=3)</span>, and any Brinkman coefficient <span>(mu &gt;0)</span>, Forchheimer coefficient <span>(beta &gt;0)</span>, and hence the 3D critical case (<span>(r=3)</span>) is also handled successfully. We deduce analogous results for 2D backward stochastic Navier–Stokes equations perturbed by Lévy noise also.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11040-023-09458-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4125172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Self-Adjointness of a Class of Multi-Spin–Boson Models with Ultraviolet Divergences 一类具有紫外发散的多自旋玻色子模型的自伴随性
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-06-12 DOI: 10.1007/s11040-023-09457-6
Davide Lonigro
{"title":"Self-Adjointness of a Class of Multi-Spin–Boson Models with Ultraviolet Divergences","authors":"Davide Lonigro","doi":"10.1007/s11040-023-09457-6","DOIUrl":"10.1007/s11040-023-09457-6","url":null,"abstract":"<div><p>We study a class of quantum Hamiltonian models describing a family of <i>N</i> two-level systems (spins) coupled with a structured boson field of positive mass, with a rotating-wave coupling mediated by form factors possibly exhibiting ultraviolet divergences. Spin–spin interactions which do not modify the total number of excitations are also included. Generalizing previous results in the single-spin case, we provide explicit expressions for the self-adjointness domain and the resolvent of these models, both of them carrying an intricate dependence on the spin–field and spin–spin coupling via a family of concatenated propagators. This construction is also shown to be stable, in the norm resolvent sense, under approximations of the form factors via normalizable ones, for example an ultraviolet cutoff.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11040-023-09457-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4801137","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On Quantum Optimal Transport 关于量子最优输运
IF 1 3区 数学
Mathematical Physics, Analysis and Geometry Pub Date : 2023-06-06 DOI: 10.1007/s11040-023-09456-7
Sam Cole, Michał Eckstein, Shmuel Friedland, Karol Życzkowski
{"title":"On Quantum Optimal Transport","authors":"Sam Cole,&nbsp;Michał Eckstein,&nbsp;Shmuel Friedland,&nbsp;Karol Życzkowski","doi":"10.1007/s11040-023-09456-7","DOIUrl":"10.1007/s11040-023-09456-7","url":null,"abstract":"<div><p>We analyze a quantum version of the Monge–Kantorovich optimal transport problem. The quantum transport cost related to a Hermitian cost matrix <i>C</i> is minimized over the set of all bipartite coupling states <span>(rho ^{AB})</span> with fixed reduced density matrices <span>(rho ^A)</span> and <span>(rho ^B)</span> of size <i>m</i> and <i>n</i>. The minimum quantum optimal transport cost <span>(textrm{T}^Q_{C}(rho ^A,rho ^B))</span> can be efficiently computed using semidefinite programming. In the case <span>(m=n)</span> the cost <span>(textrm{T}^Q_{C})</span> gives a semidistance if and only if <i>C</i> is positive semidefinite and vanishes exactly on the subspace of symmetric matrices. Furthermore, if <i>C</i> satisfies the above conditions, then <span>(sqrt{textrm{T}^Q_{C}})</span> induces a quantum analogue of the Wasserstein-2 distance. Taking the quantum cost matrix <span>(C^Q)</span> to be the projector on the antisymmetric subspace, we provide a semi-analytic expression for <span>(textrm{T}^Q_{C^Q})</span> for any pair of single-qubit states and show that its square root yields a transport distance on the Bloch ball. Numerical simulations suggest that this property holds also in higher dimensions. Assuming that the cost matrix suffers decoherence and that the density matrices become diagonal, we study the quantum-to-classical transition of the Monge–Kantorovich distance, propose a continuous family of interpolating distances, and demonstrate that the quantum transport is cheaper than the classical one. Furthermore, we introduce a related quantity—the SWAP-fidelity—and compare its properties with the standard Uhlmann–Jozsa fidelity. We also discuss the quantum optimal transport for general <i>d</i>-partite systems.</p></div>","PeriodicalId":694,"journal":{"name":"Mathematical Physics, Analysis and Geometry","volume":"26 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11040-023-09456-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4259382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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