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Analytical construction of soliton families in one‐ and two‐dimensional nonlinear Schrödinger equations with nonparity‐time‐symmetric complex potentials Stud. Appl. Math. (IF 3.108) Pub Date : 2021-04-08 Jianke Yang
The existence of soliton families in nonparity‐time‐symmetric complex potentials remains poorly understood, especially in two spatial dimensions. In this article, we analytically investigate the bifurcation of soliton families from linear modes in one‐ and two‐dimensional nonlinear Schrödinger equations with localized Wadati‐type nonparity‐time‐symmetric complex potentials. By utilizing the conservation
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Long‐time asymptotic behavior of the fifth‐order modified KdV equation in low regularity spaces Stud. Appl. Math. (IF 3.108) Pub Date : 2021-04-03 Nan Liu, Mingjuan Chen, Boling Guo
Based on the nonlinear steepest descent method of Deift and Zhou for oscillatory Riemann–Hilbert problems and the Dbar approach, the long‐time asymptotic behavior of solutions to the fifth‐order modified KdV (Korteweg–de Vries) equation on the line is studied in the case of initial conditions that belong to some weighted Sobolev spaces. Using techniques in Fourier analysis and the idea of the ‐method
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Dynamics of the predator–prey model with the Sigmoid functional response Stud. Appl. Math. (IF 3.108) Pub Date : 2021-04-03 Xianfeng Chen, Xiang Zhang
For the predator–prey model with the Sigmoid functional response, the known result is on the global stability of its positive equilibrium when it is locally stable. Here, we characterize existence of particular type of limit cycles using qualitative theory and geometric singular perturbation methods. The main results are as follows. If the positive equilibrium exists and is a weak focus, it is a stable
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Accuracy of slender body theory in approximating force exerted by thin fiber on viscous fluid Stud. Appl. Math. (IF 3.108) Pub Date : 2021-03-23 Yoichiro Mori, Laurel Ohm
We consider the mapping properties of the integral operator arising in nonlocal slender body theory (SBT) for the model geometry of a straight, periodic filament. It is well known that the classical singular SBT integral operator suffers from high wavenumber instabilities, making it unsuitable for approximating the slender body inverse problem, where the fiber velocity is prescribed and the integral
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Darboux transformations and solutions of nonlocal Hirota and Maxwell–Bloch equations Stud. Appl. Math. (IF 3.108) Pub Date : 2021-03-16 Ling An, Chuanzhong Li, Lixiang Zhang
In this paper, based on the Hirota and Maxwell–Bloch (H‐MB) system and its application in the theory of the femtosecond pulse propagation through an erbium doped fiber, we define two kinds of nonlocal Hirota and Maxwell–Bloch (NH‐MB) systems, namely, ‐symmetric NH‐MB system and reverse space‐time NH‐MB system. Then, we construct the Darboux transformations of these NH‐MB systems. Meanwhile, we derive
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Local symmetry structure and potential symmetries of time‐fractional partial differential equations Stud. Appl. Math. (IF 3.108) Pub Date : 2021-03-09 Zhi‐Yong Zhang, Zhi‐Xiang Lin
First, we show that the system consisting of integer‐order partial differential equations (PDEs) and time‐fractional PDEs with the Riemann–Liouville fractional derivative has an elegant local symmetry structure. Then with the symmetry structure we consider two particular cases where one is the pure time‐fractional PDEs whose symmetry invariant condition is divided into two parts of integer‐order and
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Success probability for selectively neutral invading species in the line model with a random fitness landscape Stud. Appl. Math. (IF 3.108) Pub Date : 2021-03-07 Suzan Farhang‐Sardroodi, Natalia L. Komarova, Marcus Michelen, Robin Pemantle
We consider a spatial (line) model for invasion of a population by a single mutant with a stochastically selectively neutral fitness landscape, independent from the fitness landscape for nonmutants. This model is similar to those considered earlier. We show that the probability of mutant fixation in a population of size , starting from a single mutant, is greater than , which would be the case if there
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Monodromy in prolate spheroidal harmonics Stud. Appl. Math. (IF 3.108) Pub Date : 2021-03-07 Sean R. Dawson, Holger R. Dullin, Diana M. H. Nguyen
We show that spheroidal wave functions viewed as the essential part of the joint eigenfunctions of two commuting operators on have a defect in the joint spectrum that makes a global labeling of the joint eigenfunctions by quantum numbers impossible. To our knowledge, this is the first explicit demonstration that quantum monodromy exists in a class of classically known special functions. Using an analog
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Isentropic approximation of the compressible Euler equations in Besov spaces Stud. Appl. Math. (IF 3.108) Pub Date : 2021-03-07 Xinglong Wu
The article mainly studies the isentropic approximation of the compressible Euler equations in Besov space , provided the initial entropy changes closing a constant in the Besov spaces, which extends and improves the result in Sobolev space by Jia and Pan.
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A simplified monotone model of Wolbachia invasion encompassing Aedes aegypti mosquitoes Stud. Appl. Math. (IF 3.108) Pub Date : 2020-12-15 Oscar Eduardo Escobar‐Lasso, Olga Vasilieva
Wolbachia‐based biocontrol has recently emerged as a potential method for the prevention and control of dengue and other vector‐borne diseases. Major vector species, such as Aedes aegypti females, when deliberately infected with Wolbachia become far less capable of getting infected and transmitting the virus to human individuals. In this paper, we propose and qualitatively analyze a simplified model
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An invariant for colored bonded knots Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-12 Boštjan Gabrovšek
We equip a knot K with a set of colored bonds, that is, colored intervals properly embedded into . Such a construction can be viewed as a structure that topologically models a closed protein chain including any type of bridges connecting the backbone residues. We introduce an invariant of such colored bonded knots that respects the HOMFLYPT relation, namely, the HOMFLYPT skein module of colored bonded
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Analyticity of rotational traveling gravity two‐layer waves Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-07 Jifeng Chu, Ling‐Jun Wang
The aim of this paper is to prove real analytic properties of all streamlines of two‐dimensional steady rotational gravity water waves in two‐layer flows. Provided that there are no stagnation points in the flow, we show that each streamline, including the free surface and the interface, is a real analytic curve if the height function is in , which corresponds to an arbitrarily bounded and measurable
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The linearized classical Boussinesq system on the half‐line Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-12 C. M. Johnston, Clarence T. Gartman, Dionyssios Mantzavinos
The linearization of the classical Boussinesq system is solved explicitly in the case of nonzero boundary conditions on the half‐line. The analysis relies on the unified transform method of Fokas and is performed in two different frameworks: (i) by exploiting the recently introduced extension of Fokas's method to systems of equations and (ii) by expressing the linearized classical Boussinesq system
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Energy thresholds of blow‐up for the Hartree equation with a focusing subcritical perturbation Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-04 Shuai Tian, Ying Yang, Rui Zhou, Shihui Zhu
This paper studies the blow‐up solutions for the Schrödinger equation with a Hartree‐type nonlinearity together with a power‐type subcritical perturbation. The precisely sharp energy thresholds for blow‐up and global existence are obtained by analyzing potential well structures for associated functionals.
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On Wiener's violent oscillations, Popov's curves, and Hopf's supercritical bifurcation for a scalar heat equation Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-13 Patrick Guidotti, Sandro Merino
A parameter‐dependent perturbation of the spectrum of the scalar Laplacian is studied for a class of nonlocal and non‐self‐adjoint rank one perturbations. A detailed description of the perturbed spectrum is obtained both for Dirichlet boundary conditions on a bounded interval as well as for the problem on the full real line. The perturbation results are applied to the study of a related parameter‐dependent
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Solutions to a phase‐field model for martensitic phase transformations driven by configurational forces Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-15 Fan Wu, Xingzhi Bian, Lixian Zhao
We study the existence of weak solutions to an initial‐boundary value problem for a new phase‐field model, which consists of a degenerate parabolic equation coupled to linear elasticity equations. This model is used to describe the evolution of interfaces in elastically deformable solid materials which moves by configurational forces, such as martensitic phase transformations in shape memory alloys
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Convergence rates of vanishing diffusion limit on conservative form of Hsieh's equation Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-13 Long Fan, Nafissa Toureche Trouba
The aim of this paper is to study the global unique solvability on Sobolev solution perturbated around diffusion waves to the Cauchy problem of conservative form of Hsieh's equations. Furthermore, convergence rates are also obtained as one of the diffusion parameters goes to zero. The difficulty is created due to conservative nonlinearity to enclose the uniform (in diffusion parameter) higher order
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Isomonodromy sets of accessory parameters for Heun class equations Stud. Appl. Math. (IF 3.108) Pub Date : 2021-02-21 Jun Xia, Shuai‐Xia Xu, Yu‐Qiu Zhao
In this paper, we consider the monodromy and, in particular, the isomonodromy sets of accessory parameters for the Heun class equations. We show that the Heun class equations can be obtained as limits of the linear systems associated with the Painlevé equations when the Painlevé transcendents go to one of the actual singular points of the linear systems. The isomonodromy sets of accessory parameters
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Spot patterns in the 2‐D Schnakenberg model with localized heterogeneities Stud. Appl. Math. (IF 3.108) Pub Date : 2021-02-21 Tony Wong, Michael J. Ward
A hybrid asymptotic‐numerical theory is developed to analyze the effect of different types of localized heterogeneities on the existence, linear stability, and slow dynamics of localized spot patterns for the two‐component Schnakenberg reaction‐diffusion model in a 2‐D domain. Two distinct types of localized heterogeneities are considered: a strong localized perturbation of a spatially uniform feed
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Uniform error estimates for the random batch method to the first‐order consensus models with antisymmetric interaction kernels Stud. Appl. Math. (IF 3.108) Pub Date : 2021-02-14 Dongnam Ko, Seung‐Yeal Ha, Shi Jin, Doheon Kim
We propose a random batch method (RBM) for a contractive interacting particle system on a network, which can be formulated as a first‐order consensus model with heterogeneous intrinsic dynamics and convolution‐type consensus interactions. The RBM was proposed and analyzed recently in a series of work by the third author and his collaborators for a general interacting particle system with a conservative
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Existence of solutions for a class of fractional difference equations at resonance Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-26 Huiqin Chen, Yaqiong Cui, Shugui Kang, Youmin Lu, Wenying Feng
We study a class of nonlinear fractional difference equations with nonlocal boundary conditions at resonance. The system is inspired by the three‐point boundary value problem for differential equations that have been extensively studied. It is also an extension to a fractional difference equation arising from real‐world applications. Converting the problem to an equivalent system corresponding to the
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The evolution of traveling waves in a KPP reaction–diffusion model with cut‐off reaction rate. II. Evolution of traveling waves Stud. Appl. Math. (IF 3.108) Pub Date : 2020-12-16 Alex D. O. Tisbury, David J. Needham, Alexandra Tzella
In Part II of this series of papers, we consider an initial‐boundary value problem for the Kolmogorov–Petrovskii–Piscounov (KPP)‐type equation with a discontinuous cut‐off in the reaction function at concentration . For fixed cut‐off value , we apply the method of matched asymptotic coordinate expansions to obtain the complete large‐time asymptotic form of the solution, which exhibits the formation
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Inverse scattering transform for the focusing nonlinear Schrödinger equation with counterpropagating flows Stud. Appl. Math. (IF 3.108) Pub Date : 2020-11-26 Gino Biondini, Jonathan Lottes, Dionyssios Mantzavinos
The inverse scattering transform for the focusing nonlinear Schrödinger equation is presented for a general class of initial conditions whose asymptotic behavior at infinity consists of counterpropagating waves. The formulation takes into account the branched nature of the two asymptotic eigenvalues of the associated scattering problem. The Jost eigenfunctions and scattering coefficients are defined
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Linear stability of transversely modulated finite‐amplitude capillary waves on deep water Stud. Appl. Math. (IF 3.108) Pub Date : 2020-11-20 Sunao Murashige, Wooyoung Choi
We investigate the three‐dimensional linear stability of the periodic motion of pure capillary waves progressing in permanent form on water of infinite depth for the whole range of wave amplitudes. After introducing a coordinate transformation based on a conformal map for two‐dimensional steady capillary waves, we perform linear stability analysis of finite‐amplitude capillary waves in the transformed
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Improved finite‐time zeroing neural network for time‐varying division Stud. Appl. Math. (IF 3.108) Pub Date : 2020-11-25 Dimitris Gerontitis, Ratikanta Behera, Jajati Keshari Sahoo, Predrag S. Stanimirović
A novel complex varying‐parameter finite‐time zeroing neural network (VPFTZNN) for finding a solution to the time‐dependent division problem is introduced. A comparative study in relation to the zeroing neural network (ZNN) and finite‐time zeroing neural network (FTZNN) is established in terms of the error function and the convergence speed. The error graphs of the VPFTZNN design show promising results
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Exact analytical solution of a novel modified nonlinear Schrödinger equation: Solitary quantum waves on a lattice Stud. Appl. Math. (IF 3.108) Pub Date : 2020-12-04 Jingxi Luo
A novel modified nonlinear Schrödinger equation is presented. Through a traveling wave ansatz, the equation is solved exactly and analytically. The soliton solution is characterized in terms of waveform and wave speed, and the dependence of these properties upon parameters in the equation is detailed. It is discovered that some parameter settings yield unique waveforms, while others yield degeneracy
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Bifurcations of thresholds in essential spectra of elliptic operators under localized non‐Hermitian perturbations Stud. Appl. Math. (IF 3.108) Pub Date : 2021-01-15 D. I. Borisov, D. A. Zezyulin, M. Znojil
We consider the operator subject to the Dirichlet or Robin condition, where a domain is bounded or unbounded. The symbol stands for a second‐order self‐adjoint differential operator on such that the spectrum of the operator contains several discrete eigenvalues , . These eigenvalues are thresholds in the essential spectrum of the operator . We study how these thresholds bifurcate once we add a small
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Commutativity of quaternion‐matrix–valued functions and quaternion matrix dynamic equations on time scales Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-20 Zhien Li, Chao Wang, Ravi P. Agarwal, Donal O'Regan
In this paper, we obtain some basic results of quaternion algorithms and quaternion calculus on time scales. Based on this, a Liouville formula and some related properties are derived for quaternion dynamic equations on time scales through conjugate transposed matrix algorithms. Moreover, we introduce the quaternion matrix exponential function by homogeneous quaternion matrix dynamic equations. Also
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Well‐posedness, positivity, and time asymptotics properties for a reaction–diffusion model of plankton communities, involving a rational nonlinearity with singularity Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-20 Antoine Perasso, Quentin Richard, Irene Azzali, Ezio Venturino
In this work, we consider a reaction–diffusion system, modeling the interaction between nutrients, phytoplankton, and zooplankton. Using a semigroup approach in , we prove global existence, uniqueness, and positivity of the solutions. The nonlinearity is handled by providing estimates in , allowing to deal with most of the functional responses that describe predator/prey interactions (Holling I, II
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Integrable symplectic maps associated with discrete Korteweg‐de Vries‐type equations Stud. Appl. Math. (IF 3.108) Pub Date : 2020-11-13 Xiaoxue Xu, Mengmeng Jiang, Frank W Nijhoff
In this paper, we present novel integrable symplectic maps, associated with ordinary difference equations, and show how they determine, in a remarkably diverse manner, the integrability, including Lax pairs and the explicit solutions, for integrable partial difference equations which are the discrete counterparts of integrable partial differential equations of Korteweg‐de Vries‐type (KdV‐type). As
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Sharp estimate of electric field from a conductive rod and application Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-28 Xiaoping Fang, Youjun Deng, Hongyu Liu
We are concerned with the quantitative study of the electric field perturbation due to the presence of an inhomogeneous conductive rod embedded in a homogenous conductivity. We sharply quantify the dependence of the perturbed electric field on the geometry of the conductive rod. In particular, we accurately characterize the localization of the gradient field (i.e., the electric current) near the boundary
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Ladder relations for a class of matrix valued orthogonal polynomials Stud. Appl. Math. (IF 3.108) Pub Date : 2020-11-11 Alfredo Deaño, Bruno Eijsvoogel, Pablo Román
Using the theory introduced by Casper and Yakimov, we investigate the structure of algebras of differential and difference operators acting on matrix valued orthogonal polynomials (MVOPs) on , and we derive algebraic and differential relations for these MVOPs. A particular case of importance is that of MVOPs with respect to a matrix weight of the form on the real line, where is a scalar polynomial
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High‐order exceptional points and enhanced sensing in subwavelength resonator arrays Stud. Appl. Math. (IF 3.108) Pub Date : 2020-11-08 Habib Ammari, Bryn Davies, Erik Orvehed Hiltunen, Hyundae Lee, Sanghyeon Yu
Systems exhibiting degeneracies known as exceptional points have remarkable properties with powerful applications, particularly in sensor design. These degeneracies are formed when eigenstates coincide, and the remarkable effects are exaggerated by increasing the order of the exceptional point (i.e., the number of coincident eigenstates). In this work, we use asymptotic techniques to study ‐symmetric
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Real Lax spectrum implies spectral stability Stud. Appl. Math. (IF 3.108) Pub Date : 2020-09-03 Jeremy Upsal, Bernard Deconinck
We consider the dynamical stability of periodic and quasiperiodic stationary solutions of integrable equations with 2 2 Lax pairs. We construct the eigenfunctions and hence the Floquet discriminant for such Lax pairs. The boundedness of the eigenfunctions determines the Lax spectrum. We use the squared eigenfunction connection between the Lax spectrum and the stability spectrum to show that the subset
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The short pulse equation: Bäcklund transformations and applications Stud. Appl. Math. (IF 3.108) Pub Date : 2020-09-14 Hui Mao, Q. P. Liu
A Bäcklund transformation (BT), which involves both independent and dependent variables, is established and studied for the short pulse (SP) equation. Based it, the nonlinear superposition formulae for 2‐, 3‐, and 4‐BT are presented. The general result for the composition of ‐BTs is achieved and given in terms of determinants. As applications, various solutions including loop solitons, breather solutions
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The regularity of the multiple higher‐order poles solitons of the NLS equation Stud. Appl. Math. (IF 3.108) Pub Date : 2020-09-23 Yongshuai Zhang, Xiangxing Tao, Tengteng Yao, Jingsong He
Based on the inverse scattering method, the formulae of one higher‐order pole solitons and multiple higher‐order poles solitons of the nonlinear Schrödinger equation (NLS) equation are obtained. Their denominators are expressed as , where is a matrix frequently constructed for solving the Riemann‐Hilbert problem, and the asterisk denotes complex conjugate. We take two methods for proving is invertible
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Gaussian unitary ensembles with two jump discontinuities, PDEs, and the coupled Painlevé II and IV systems Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-14 Shulin Lyu, Yang Chen
We consider the Hankel determinant generated by the Gaussian weight with two jump discontinuities. Utilizing the results of Min and Chen [Math. Methods Appl Sci. 2019;42:301‐321] where a second‐order partial differential equation (PDE) was deduced for the log derivative of the Hankel determinant by using the ladder operators adapted to orthogonal polynomials, we derive the coupled Painlevé IV system
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Using Symmetries à Rebours Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-07 Edvige Pucci, Giuseppe Saccomandi
We consider nonclassical symmetries of partial differential equations (PDEs) in dimensions. Given a th‐order ordinary differential equation in the unknown we are able to find the most general scalar PDE of a given order which can be reduced via a nonclassical symmetry to .
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The evolution of traveling waves in a KPP reaction‐diffusion model with cut‐off reaction rate. I. Permanent form traveling waves Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-06 Alex D. O. Tisbury, David J. Needham, Alexandra Tzella
We consider Kolmogorov‐Petrovskii‐Piscounov (KPP) type models in the presence of a discontinuous cut‐off in reaction rate at concentration . In Part I, we examine permanent form traveling wave solutions (a companion paper, Part II, is devoted to their evolution in the large time limit). For each fixed cut‐off value , we prove the existence of a unique permanent form traveling wave with a continuous
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Doubly periodic lozenge tilings of a hexagon and matrix valued orthogonal polynomials Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-02 Christophe Charlier
We analyze a random lozenge tiling model of a large regular hexagon, whose underlying weight structure is periodic of period 2 in both the horizontal and vertical directions. This is a determinantal point process whose correlation kernel is expressed in terms of non‐Hermitian matrix valued orthogonal polynomials (OPs). This model belongs to a class of models for which the existing techniques for studying
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Mass‐in‐mass lattices with small internal resonators Stud. Appl. Math. (IF 3.108) Pub Date : 2020-10-02 Fazel Hadadifard, J. Douglas Wright
We consider the mass‐in‐mass (MiM) lattice when the internal resonators are very small. When there are no internal resonators the lattice reduces to a standard Fermi‐Pasta‐Ulam‐Tsingou (FPUT) system. We show that the solution of the MiM system, with suitable initial data, shadows the FPUT system for long periods of time. Using some classical oscillatory integral estimates we can conclude that the error
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Asymptotic solutions of inhomogeneous differential equations having a turning point Stud. Appl. Math. (IF 3.108) Pub Date : 2020-07-18 T. M. Dunster
Asymptotic solutions are derived for inhomogeneous differential equations having a large real or complex parameter and a simple turning point. They involve Scorer functions and three slowly varying analytic coefficient functions. The asymptotic approximations are uniformly valid for unbounded complex values of the argument, and are applied to inhomogeneous Airy equations having polynomial and exponential
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Integrability, existence of global solutions, and wave breaking criteria for a generalization of the Camassa–Holm equation Stud. Appl. Math. (IF 3.108) Pub Date : 2020-07-22 Priscila Leal da Silva, Igor Leite Freire
Recent generalizations of the Camassa–Holm equation are studied from the point of view of existence of global solutions, criteria for wave breaking phenomena and integrability. We provide conditions, based on lower bounds for the first spatial derivative of local solutions, for global well‐posedness in Sobolev spaces for the family under consideration. Moreover, we prove that wave breaking phenomena
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Inverse scattering transforms and soliton solutions of nonlocal reverse‐space nonlinear Schrödinger hierarchies Stud. Appl. Math. (IF 3.108) Pub Date : 2020-07-25 Wen‐Xiu Ma, Yehui Huang, Fudong Wang
The aim of the paper is to construct nonlocal reverse‐space nonlinear Schrödinger (NLS) hierarchies through nonlocal group reductions of eigenvalue problems and generate their inverse scattering transforms and soliton solutions. The inverse scattering problems are formulated by Riemann‐Hilbert problems which determine generalized matrix Jost eigenfunctions. The Sokhotski‐Plemelj formula is used to
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Quasi‐stability and upper semicontinuity for coupled parabolic equations with memory Stud. Appl. Math. (IF 3.108) Pub Date : 2020-08-01 Moncef Aouadi
This current study deals with the long‐time dynamics of a nonlinear system of coupled parabolic equations with memory. The system describes the thermodiffusion phenomenon where the fluxes of mass diffusion and heat depend on the past history of the chemical potential and the temperature gradients, respectively, according to Gurtin‐Pipkin's law. Inspired by the works of Chueshov and Lasiecka on the
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Multiscale expansions avector solitons of a two‐dimensional nonlocal nonlinear Schrödinger system Stud. Appl. Math. (IF 3.108) Pub Date : 2020-08-05 Georgios N. Koutsokostas, Theodoros P. Horikis, Dimitrios J. Frantzeskakis, Barbara Prinari, Gino Biondini
One‐ and two‐dimensional solitons of a multicomponent nonlocal nonlinear Schrödinger (NLS) system are constructed. The model finds applications in nonlinear optics, where it may describe the interaction of optical beams of different frequencies. We asymptotically reduce the model, via multiscale analysis, to completely integrable ones in both Cartesian and cylindrical geometries; we thus derive a
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Kinetic energy of the Langevin particle Stud. Appl. Math. (IF 3.108) Pub Date : 2020-08-01 Carlos Escudero
We compute the kinetic energy of the Langevin particle using different approaches. We build stochastic differential equations that describe this physical quantity based on both the Itô and Stratonovich stochastic integrals. It is shown that the Itô equation possesses a unique solution, whereas the Stratonovich one possesses infinitely many, all but one absent of physical meaning. We discuss how this
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A difference equation approach to Plancherel‐Rotach asymptotics for ‐orthogonal polynomials Stud. Appl. Math. (IF 3.108) Pub Date : 2020-08-01 Mourad Ismail, Chun‐Kong Law
In this paper, we employ a difference equation approach to study the Plancherel‐Rotach asymptotics of ‐orthogonal polynomials about their largest zeros. Our method for ‐difference equations is an analogue to the turning point problem for Hermite differential equations. It works well in the toy problems of Stieltjes‐Wigert polynomials and ‐Hermite polynomials.
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Stable blow‐up dynamics in the ‐critical and ‐supercritical generalized Hartree equation Stud. Appl. Math. (IF 3.108) Pub Date : 2020-08-01 Kai Yang, Svetlana Roudenko, Yanxiang Zhao
We study stable blow‐up dynamics in the generalized Hartree equation with radial symmetry, which is a Schrödinger‐type equation with a nonlocal, convolution‐type nonlinearity: First, we consider the ‐critical case in dimensions and obtain that a generic blow‐up has a self‐similar structure and exhibits not only the square root blowup rate , but also the log‐log correction (via asymptotic analysis and
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Viscosity solutions to a Cauchy problem of a phase‐field model for solid‐solid phase transitions Stud. Appl. Math. (IF 3.108) Pub Date : 2020-07-09 Junzhi Zheng
We investigate a partial differential equation which models solid‐solid phase transitions. This model is for martensitic phase transitions driven by configurational force and its counterpart is for interface motion by mean curvature. Mathematically, this equation is a second‐order nonlinear degenerate parabolic equation. And in multidimensional case, its principal part cannot be written into divergence
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Semiclassical dynamics and coherent soliton condensates in self‐focusing nonlinear media with periodic initial conditions Stud. Appl. Math. (IF 3.108) Pub Date : 2020-07-02 Gino Biondini, Jeffrey Oregero
The semiclassical (small dispersion) limit of the focusing nonlinear Schrödinger equation with periodic initial conditions (ICs) is studied analytically and numerically. First, through a comprehensive set of numerical simulations, it is demonstrated that solutions arising from a certain class of ICs, referred to as “periodic single‐lobe” potentials, share the same qualitative features, which also coincide
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Connection formulae for asymptotics of the fifth Painlevé transcendent on the imaginary axis: I Stud. Appl. Math. (IF 3.108) Pub Date : 2020-07-02 Fedor V. Andreev, Alexander V. Kitaev
Leading terms of asymptotic expansions for the general complex solutions of the fifth Painlevé equation as are found. These asymptotics are parameterized by monodromy data of the associated linear ODE, The parameterization allows one to derive connection formulae for the asymptotics. We provide numerical verification of the results. Important special cases of the connection formulae are also considered
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Zeroth‐order conservation laws of two‐dimensional shallow water equations with variable bottom topography Stud. Appl. Math. (IF 3.108) Pub Date : 2020-06-26 Alexander Bihlo, Roman O. Popovych
We classify zeroth‐order conservation laws of systems from the class of two‐dimensional shallow water equations with variable bottom topography using an optimized version of the method of furcate splitting. The classification is carried out up to equivalence generated by the equivalence group of this class. We find additional point equivalences between some of the listed cases of extensions of the
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Kernel density estimation with linked boundary conditions Stud. Appl. Math. (IF 3.108) Pub Date : 2020-06-18 Matthew J. Colbrook, Zdravko I. Botev, Karsten Kuritz, Shev MacNamara
Kernel density estimation on a finite interval poses an outstanding challenge because of the well‐recognized bias at the boundaries of the interval. Motivated by an application in cancer research, we consider a boundary constraint linking the values of the unknown target density function at the boundaries. We provide a kernel density estimator (KDE) that successfully incorporates this linked boundary
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Low‐frequency dipolar electromagnetic scattering by a solid ellipsoid in lossless environment Stud. Appl. Math. (IF 3.108) Pub Date : 2020-06-10 Panayiotis Vafeas
Electromagnetic wave scattering phenomena for target identification are important in many applications related to fundamental science and engineering. Here, we present an analytical formulation for the calculation of the magnetic and electric fields that scatter off a highly conductive ellipsoidal body, located within an otherwise homogeneous and isotropic lossless medium. The primary excitation source
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Solutions with concentration for conservation laws with discontinuous flux and its applications to numerical schemes for hyperbolic systems Stud. Appl. Math. (IF 3.108) Pub Date : 2020-06-10 Aekta Aggarwal, Manas Ranjan Sahoo, Abhrojyoti Sen, Ganesh Vaidya
Measure‐valued weak solutions for conservation laws with discontinuous flux are proposed and explicit formulae have been derived. We propose convergent discontinuous flux‐based numerical schemes for the class of hyperbolic systems that admit nonclassical ‐shocks, by extending the theory of discontinuous flux for nonlinear conservation laws to scalar transport equation with a discontinuous coefficient
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Sparse spectral and ‐finite element methods for partial differential equations on disk slices and trapeziums Stud. Appl. Math. (IF 3.108) Pub Date : 2020-06-10 Ben Snowball, Sheehan Olver
Sparse spectral methods for solving partial differential equations have been derived in recent years using hierarchies of classical orthogonal polynomials on intervals, disks, and triangles. In this work, we extend this methodology to a hierarchy of nonclassical orthogonal polynomials on disk slices and trapeziums. This builds on the observation that sparsity is guaranteed due to the boundary being
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Stäckel transform of Lax equations Stud. Appl. Math. (IF 3.108) Pub Date : 2020-06-10 Maciej Błaszak, Krzysztof Marciniak
We construct a map between Lax equations for pairs of Liouville integrable Hamiltonian systems related by a multiparameter Stäckel transform. Using this map, we construct Lax representation for a wide class of separable systems by applying the multiparameter Stäckel transform to Lax equations of suitably chosen systems from a seed class. For a given separable system, we obtain in this way a set of
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General soliton solutions to a reverse‐time nonlocal nonlinear Schrödinger equation Stud. Appl. Math. (IF 3.108) Pub Date : 2020-05-27 Rusuo Ye, Yi Zhang
General soliton solutions to a reverse‐time nonlocal nonlinear Schrödinger (NLS) equation are discussed via a matrix version of binary Darboux transformation. With this technique, searching for solutions of the Lax pair is transferred to find vector solutions of the associated linear differential equation system. From vanishing and nonvanishing seed solutions, general vector solutions of such linear
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Periodic problem for the nonlinear damped wave equation with convective nonlinearity Stud. Appl. Math. (IF 3.108) Pub Date : 2020-05-27 Rafael Carreño‐Bolaños, Beatriz Juarez‐Campos, Pavel I. Naumkin
We study the nonlinear damped wave equation with a linear pumping and a convective nonlinearity. We consider the solutions, which satisfy the periodic boundary conditions. Our aim is to prove global existence of solutions to the periodic problem for the nonlinear damped wave equation by applying the energy‐type estimates and estimates for the Green operator. Moreover, we study the asymptotic profile
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