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Complementarity vs coordinate transformations: Mapping between pseudo-Hermiticity and weak pseudo-Hermiticity 互补与坐标变换:伪厄密性与弱伪厄密性之间的映射
Pub Date : 2020-11-05 DOI: 10.1063/5.0036401
Samir Saidani, S. Yahiaoui
noindent We study the concept of the complementarity, introduced by Bagchi and Quesne in [Phys. Lett. A {bf 301}, 173 (2002)], between pseudo-Hermiticity and weak pseudo-Hermiticity in a rigorous mathematical viewpoint of coordinate transformations when a system has a position-dependent mass. We first determine, under the modified-momentum, the generating functions identifying the complexified potentials $V_pm(x)$ under both concepts of pseudo-Hermiticity $widetildeeta_+$ (resp. weak pseudo-Hermiticity $widetildeeta_-$). We show that the concept of complementarity can be understood and interpreted as a coordinate transformation through their respective generating functions. As consequence, a similarity transformation which implements coordinate transformations is obtained. We show that the similarity transformation is set up as fundamental relationship connecting both $widetildeeta_+$ and $widetildeeta_-$. A special factorization $eta_+=eta_-^dagger eta_-$ is discussed in the case of a constant mass and some B"acklund transformations are derived.
本文研究了由Bagchi和Quesne在《物理学》中提出的互补概念。列托人。[j] .中国科学:地球科学[j], vol . 17(2002)],当系统具有位置相关质量时,坐标变换的伪厄米性和弱伪厄米性。在修正动量下,我们首先确定了在伪厄米性的两个概念下识别复化势的生成函数$V_pm(x)$。弱伪厄密性$ widdetilde eta_-$)。我们证明了互补的概念可以被理解和解释为通过它们各自的生成函数的坐标变换。从而得到了实现坐标变换的相似变换。我们证明了相似性变换被建立为连接$ widdetilde eta_+$和$ widdetilde eta_-$的基本关系。讨论了恒定质量下的一个特殊分解$eta_+=eta_-^dagger eta_-$,并推导了一些B acklund变换。
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引用次数: 0
Nodal deficiency of random spherical harmonics in presence of boundary 存在边界时随机球谐波的节点缺陷
Pub Date : 2020-11-03 DOI: 10.1063/5.0036084
Valentina Cammarota, D. Marinucci, I. Wigman
We consider a random Gaussian model of Laplace eigenfunctions on the hemisphere satisfying the Dirichlet boundary conditions along the equator. For this model we find a precise asymptotic law for the corresponding zero density functions, in both short range (around the boundary) and long range (far away from the boundary) regimes. As a corollary, we were able to find a logarithmic negative bias for the total nodal length of this ensemble relatively to the rotation invariant model of random spherical harmonics. Jean Bourgain's research, and his enthusiastic approach to the nodal geometry of Laplace eigenfunctions, has made a crucial impact in the field and the current trends within. His works on the spectral correlations (Theorem 2.2 in Krishnapur, Kurlberg and Wigman (2013)) and joint with Bombieri (Bourgain and Bombieri (2015)) have opened a door for an active ongoing research on the nodal length of functions defined on surfaces of arithmetic flavour, like the torus or the square. Further, Bourgain's work on toral Laplace eigenfunctions (Bourgain (2014)), also appealing to spectral correlations, allowed for inferring deterministic results from their random Gaussian counterparts.
考虑沿赤道满足狄利克雷边界条件的半球上拉普拉斯特征函数的随机高斯模型。对于这个模型,我们发现了相应的零密度函数在短距离(边界附近)和远距离(远离边界)状态下的精确渐近律。作为推论,我们能够找到相对于随机球谐波的旋转不变模型,该集合的总节点长度的对数负偏差。Jean Bourgain的研究,以及他对拉普拉斯特征函数的节点几何的热情方法,在该领域和当前的趋势中产生了至关重要的影响。他在谱相关性(Krishnapur, Kurlberg和Wigman(2013)中的定理2.2)方面的工作,以及与Bombieri (Bourgain和Bombieri(2015))的合作,为在算术风格的表面(如环面或方形)上定义的函数的节点长度的积极研究打开了一道门。此外,Bourgain关于整体拉普拉斯特征函数的研究(Bourgain(2014))也吸引了光谱相关性,允许从随机高斯对应物中推断确定性结果。
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引用次数: 2
Characteristic determinant and Manakov triple for the double elliptic integrable system 双椭圆可积系统的特征行列式和Manakov三重
Pub Date : 2020-10-16 DOI: 10.21468/SCIPOSTPHYS.10.3.055
A. Grekov, Andrei Vladimirovich Zotov
Using the intertwining matrix of the IRF-Vertex correspondence we propose a determinant representation for the generating function of the commuting Hamiltonians of the double elliptic integrable system. More precisely, it is a ratio of the normally ordered determinants, which turns into a single determinant in the classical case. With its help we reproduce the recently suggested expression for the eigenvalues of the Hamiltonians for the dual to elliptic Ruijsenaars model. Next, we study the classical counterpart of our construction, which gives expression for the spectral curve and the corresponding $L$-matrix. This matrix is obtained explicitly as a weighted average of the Ruijsenaars and/or Sklyanin type Lax matrices with the weights as in the theta function series definition. By construction the $L$-matrix satisfies the Manakov triple representation instead of the Lax equation. Finally, we discuss the factorized structure of the $L$-matrix.
利用irf -顶点对应的交织矩阵,给出了双椭圆可积系统交换哈密顿的生成函数的行列式表示。更准确地说,它是正常有序行列式的比率,在经典情况下,它变成了一个单一的行列式。在它的帮助下,我们重现了最近提出的对偶到椭圆rujsenaars模型的哈密顿量的特征值表达式。接下来,我们研究了我们构造的经典对应物,给出了光谱曲线和相应的L矩阵的表达式。这个矩阵被明确地作为rujsenaars和/或Sklyanin型Lax矩阵的加权平均,其权重与函数级数定义中的相同。通过构造$L$-矩阵来满足Manakov三重表示而不是Lax方程。最后,我们讨论了L矩阵的分解结构。
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引用次数: 5
Gauge transformations of spectral triples with twisted real structures 具有扭曲实结构的谱三元组的规范变换
Pub Date : 2020-09-24 DOI: 10.1063/5.0038601
Adam M. Magee, Ludwik D൅browski
We study the coupling of spectral triples with twisted real structures to gauge fields in the framework of noncommutative geometry and, adopting Morita equivalence via modules and bimodules as a guiding principle, give special attention to modifying the inner fluctuations of the Dirac operator. In particular, we analyse the twisted first-order condition as a possible alternative to the approach of arXiv:1304.7583, and elaborate upon the special case of gauge transformations accordingly. Applying the formalism to a toy model, we argue that under certain physically-motivated assumptions the spectral triple based on the left-right symmetric algebra should reduce to that of the Standard Model of fundamental particles and interactions, as in the untwisted case.
在非交换几何的框架下,研究了具有扭曲实结构的谱三元组与规范场的耦合,并以模和双模的Morita等价为指导原则,特别注意了狄拉克算子的内涨落的修正。特别地,我们分析了扭曲一阶条件作为arXiv:1304.7583方法的一种可能的替代方法,并相应地详细说明了规范变换的特殊情况。将形式主义应用于一个玩具模型,我们认为在某些物理动机的假设下,基于左右对称代数的谱三重应该减少到基本粒子和相互作用的标准模型,就像在未扭曲的情况下一样。
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引用次数: 2
New algebraically solvable systems of two autonomous first-order ordinary differential equations with purely quadratic right-hand sides 具有纯二次边的两个自治一阶常微分方程的新代数可解系统
Pub Date : 2020-09-23 DOI: 10.1063/5.0011257
F. Calogero, R. Conte, F. Leyvraz
We identify many new solvable subcases of the general dynamical system characterized by two autonomous first-order ordinary differential equations with purely quadratic right-hand sides; the solvable character of these dynamical systems amounting to the possibility to obtain the solution of their initial value problem via algebraic operations. Equivalently---by considering the analytic continuation of these systems to complex time---their algebraically solvable character corresponds to the fact that their general solution is either singlevalued or features only a finite number of algebraic branch points as functions of complex time (the independent variable). Thus our results provide a major enlargement of the class of solvable systems beyond those with singlevalued general solution identified by Garnier about 60 years ago. An interesting property of several of these new dynamical systems is the elementary character of their general solution, identifiable as the roots of a polynomial with explicitly obtainable time-dependent coefficients. We also mention that, via a well-known time-dependent change of (dependent and independent) variables featuring the imaginary parameter $% mathbf{i} omega $ (with $omega $ an arbitrary strictly positive real number), autonomous variants can be explicitly exhibited of each of the algebraically solvable models we identify: variants which all feature the remarkable property to be isochronous, i.e. their generic solution is periodic with a period that is a fixed integer multiple of the basic period $T=2pi/omega$.
我们确定了以两个独立的一阶常微分方程为特征的一般动力系统的许多新的可解子情况;这些动力系统的可解性意味着可以通过代数运算获得其初值问题的解。同样,通过考虑这些系统到复时间的解析延拓,它们的代数可解特征对应于这样一个事实,即它们的通解要么是单值的,要么只有有限数量的代数分支点作为复时间(自变量)的函数。因此,我们的结果提供了一个主要的扩展类的可解系统,超出了那些具有单值通解的伽尼尔大约60年前确定。这些新动力系统的一个有趣的性质是它们的通解的基本特征,可以用具有显式可得的时间相关系数的多项式的根来识别。我们还提到,通过众所周知的随时间变化的(因变量和自变量)变量,其特征是虚参数$% mathbf{i} omega $(其中$omega $是任意严格正实数),我们识别的每个代数可解模型都可以显式地展示自治变体:这些变体都具有显著的等时性,即它们的一般解是周期的,其周期是基本周期$T=2pi/ ω $的固定整数倍。
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引用次数: 6
All self-adjoint extensions of the magnetic Laplacian in nonsmooth domains and gauge transformations 磁拉普拉斯算子在非光滑域和规范变换中的所有自伴随扩展
Pub Date : 2020-09-23 DOI: 10.2422/2036-2145.201908_008
C. Oliveira, W. Monteiro
We use boundary triples to find a parametrization of all self-adjoint extensions of the magnetic Schrodinger operator, in a quasi-convex domain~$Omega$ with compact boundary, and magnetic potentials with components in $textrm{W}^{1}_{infty}(overline{Omega})$. This gives also a new characterization of all self-adjoint extensions of the Laplacian in nonregular domains. Then we discuss gauge transformations for such self-adjoint extensions and generalize a characterization of the gauge equivalence of the Dirichlet magnetic operator for the Dirichlet Laplacian; the relation to the Aharonov-Bohm effect, including irregular solenoids, is also discussed. In particular, in case of (bounded) quasi-convex domains it is shown that if some extension is unitarily equivalent (through the multiplication by a smooth unit function) to a realization with zero magnetic potential, then the same occurs for all self-adjoint realizations.
我们使用边界三元组找到磁性薛定谔算子的所有自伴随扩展的参数化,在具有紧边界的拟凸域$Omega$中,以及在$textrm{W}^{1}_{infty}(overline{Omega})$中具有分量的磁势。这也给出了拉普拉斯算子在非正则域上的所有自伴随扩展的一个新的表征。然后讨论了这类自伴随扩展的规范变换,并推广了Dirichlet拉普拉斯算子的Dirichlet磁算子的规范等价的一个表征;还讨论了包括不规则螺线管在内的与Aharonov-Bohm效应的关系。特别地,在(有界)拟凸域的情况下,证明了如果某些扩展(通过与光滑单位函数的乘法)与具有零磁势的实现是一致等价的,那么对于所有自伴随实现都是相同的。
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引用次数: 1
Rational solutions of Painlevé systems. painlev<s:1>系统的理性解。
Pub Date : 2020-09-23 DOI: 10.1201/9780429263743-9
D. Gómez‐Ullate, Y. Grandati, R. Milson
Although the solutions of Painleve equations are transcendental in the sense that they cannot be expressed in terms of known elementary functions, there do exist rational solutions for specialized values of the equation parameters. A very successful approach in the study of rational solutions to Painleve equations involves the reformulation of these scalar equations into a symmetric system of coupled, Riccati-like equations known as dressing chains. Periodic dressing chains are known to be equivalent to the $A_N$-Painleve system, first described by Noumi and Yamada. The Noumi-Yamada system, in turn, can be linearized as using bilinear equations and $tau$-functions; the corresponding rational solutions can then be given as specializations of rational solutions of the KP hierarchy. The classification of rational solutions to Painleve equations and systems may now be reduced to an analysis of combinatorial objects known as Maya diagrams. The upshot of this analysis is a an explicit determinental representation for rational solutions in terms of classical orthogonal polynomials. In this paper we illustrate this approach by describing Hermite-type rational solutions of Painleve of the Noumi-Yamada system in terms of cyclic Maya diagrams. By way of example we explicitly construct Hermite-type solutions for the PIV, PV equations and the $A_4$ Painleve system.
虽然Painleve方程的解是超越的,即它们不能用已知的初等函数来表示,但对于方程参数的特定值确实存在理性解。在研究Painleve方程的有理解中,一个非常成功的方法是将这些标量方程重新表述为一个对称的耦合系统,即称为修饰链的类里卡蒂方程。众所周知,周期修饰链相当于由Noumi和Yamada首先描述的$A_N$-Painleve系统。反过来,Noumi-Yamada系统可以线性化为使用双线性方程和$tau$-函数;相应的有理解可以作为KP层次的有理解的专门化给出。painlevel方程和系统的有理解的分类现在可以简化为对被称为玛雅图的组合对象的分析。这种分析的结果是一个显式的行列式的有理解的形式,在经典的正交多项式。本文通过用循环玛雅图描述Noumi-Yamada系统painlevel的hermite型有理解来说明这种方法。通过实例,我们明确地构造了PIV、PV方程和$A_4$ Painleve系统的hermite型解。
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引用次数: 1
Coherent states of systems with pure continuous energy spectra 纯连续能谱系统的相干态
Pub Date : 2020-09-21 DOI: 10.1063/5.0030759
Z. Mouayn, H. A. Yamani
While dealing with a Hamiltonian with continuous spectrum we use a tridiagonal method involving orthogonal polynomials to construct a set of coherent states obeying a Glauber-type condition. We perform a Bayesian decomposition of the weight function of the orthogonality measure to show that the obtained coherent states can be recast in the Gazeau-Klauder approach. The Hamiltonian of the $ell$-wave free particle is treated as an example to illustrate the method.
在处理具有连续谱的哈密顿量时,我们使用了一个包含正交多项式的三对角线方法来构造一个符合glauber型条件的相干态集合。我们对正交度量的权函数进行贝叶斯分解,以证明在Gazeau-Klauder方法中获得的相干态可以被重铸。以自由波粒子的哈密顿量为例说明了该方法。
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引用次数: 1
Revisiting Groeneveld’s approach to the virial expansion 再次回顾格林内菲尔德的病毒式扩张方法
Pub Date : 2020-09-19 DOI: 10.1063/5.0030148
S. Jansen
A generalized version of Groeneveld's convergence criterion for the virial expansion and generating functionals for weighted $2$-connected graphs is proven. The criterion works for inhomogeneous systems and yields bounds for the density expansions of the correlation functions $rho_s$ (a.k.a. distribution functions or factorial moment measures) of grand-canonical Gibbs measures with pairwise interactions. The proof is based on recurrence relations for graph weights related to the Kirkwood-Salsburg integral equation for correlation functions. The proof does not use an inversion of the density-activity expansion, however a Moebius inversion on the lattice of set partitions enters the derivation of the recurrence relations.
证明了加权$2$连通图的虚展开和生成泛函的广义版Groeneveld收敛准则。该准则适用于非齐次系统,并给出具有成对相互作用的大正则吉布斯测度的相关函数$rho_s$(又称分布函数或阶乘矩测度)的密度展开的界。该证明是基于与相关函数的Kirkwood-Salsburg积分方程相关的图权的递归关系。该证明没有使用密度-活度展开的反转,而是在集合分区的格上使用莫比乌斯反转来推导递推关系。
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引用次数: 4
Landau levels for the (2 + 1) Dunkl–Klein–Gordon oscillator (2 + 1) Dunkl-Klein-Gordon振荡器的朗道能级
Pub Date : 2020-09-11 DOI: 10.1142/S0217732321500668
R. D. Mota, D. Ojeda-Guill'en, M.Salazar-Ram'irez, V. Granados
In this paper we study the $(2+1)$-dimensional Klein-Gordon oscillator coupled to an external magnetic field, in which we change the standard partial derivatives for the Dunkl derivatives. We find the energy spectrum (Landau levels) in an algebraic way, by introducing three operators that close the $su(1,1)$ Lie algebra and from the theory of unitary representations. Also we find the energy spectrum and the eigenfunctions analytically, and we show that both solutions are consistent. Finally, we demonstrate that when the magnetic field vanishes or when the parameters of the Dunkl derivatives are set zero, our results are adequately reduced to those reported in the literature.
本文研究了耦合于外加磁场的$(2+1)$维Klein-Gordon振荡器,并改变了其Dunkl导数的标准偏导数。通过引入三个接近$su(1,1)$李代数的算子,并从酉表示理论出发,用代数方法求出能谱(朗道能级)。我们还解析地求出了能量谱和特征函数,并证明了两者的解是一致的。最后,我们证明了当磁场消失或当Dunkl导数的参数设为零时,我们的结果可以充分地简化为文献中报道的结果。
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引用次数: 2
期刊
arXiv: Mathematical Physics
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