Subjects -> MATHEMATICS (Total: 1013 journals)
    - APPLIED MATHEMATICS (92 journals)
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    - MATHEMATICS (714 journals)
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MATHEMATICS (714 journals)            First | 1 2 3 4     

Showing 601 - 538 of 538 Journals sorted alphabetically
Results in Control and Optimization     Open Access  
Results in Mathematics     Hybrid Journal  
Results in Nonlinear Analysis     Open Access  
Review of Symbolic Logic     Full-text available via subscription   (Followers: 2)
Reviews in Mathematical Physics     Hybrid Journal   (Followers: 1)
Revista Baiana de Educação Matemática     Open Access  
Revista Bases de la Ciencia     Open Access  
Revista BoEM - Boletim online de Educação Matemática     Open Access  
Revista Colombiana de Matemáticas     Open Access   (Followers: 1)
Revista de Ciencias     Open Access  
Revista de Educación Matemática     Open Access  
Revista de la Escuela de Perfeccionamiento en Investigación Operativa     Open Access  
Revista de la Real Academia de Ciencias Exactas, Fisicas y Naturales. Serie A. Matematicas     Partially Free  
Revista de Matemática : Teoría y Aplicaciones     Open Access   (Followers: 1)
Revista Digital: Matemática, Educación e Internet     Open Access  
Revista Electrónica de Conocimientos, Saberes y Prácticas     Open Access  
Revista Integración : Temas de Matemáticas     Open Access  
Revista Internacional de Sistemas     Open Access  
Revista Latinoamericana de Etnomatemática     Open Access  
Revista Latinoamericana de Investigación en Matemática Educativa     Open Access  
Revista Matemática Complutense     Hybrid Journal  
Revista REAMEC : Rede Amazônica de Educação em Ciências e Matemática     Open Access  
Revista SIGMA     Open Access  
Ricerche di Matematica     Hybrid Journal  
RMS : Research in Mathematics & Statistics     Open Access  
Royal Society Open Science     Open Access   (Followers: 7)
Russian Journal of Mathematical Physics     Full-text available via subscription  
Russian Mathematics     Hybrid Journal  
Sahand Communications in Mathematical Analysis     Open Access  
Sampling Theory, Signal Processing, and Data Analysis     Hybrid Journal  
São Paulo Journal of Mathematical Sciences     Hybrid Journal  
Science China Mathematics     Hybrid Journal   (Followers: 1)
Science Progress     Full-text available via subscription   (Followers: 1)
Sciences & Technologie A : sciences exactes     Open Access  
Selecta Mathematica     Hybrid Journal   (Followers: 1)
SeMA Journal     Hybrid Journal  
Semigroup Forum     Hybrid Journal   (Followers: 1)
Set-Valued and Variational Analysis     Hybrid Journal  
SIAM Journal on Applied Mathematics     Hybrid Journal   (Followers: 11)
SIAM Journal on Computing     Hybrid Journal   (Followers: 11)
SIAM Journal on Control and Optimization     Hybrid Journal   (Followers: 18)
SIAM Journal on Discrete Mathematics     Hybrid Journal   (Followers: 8)
SIAM Journal on Financial Mathematics     Hybrid Journal   (Followers: 3)
SIAM Journal on Mathematics of Data Science     Hybrid Journal   (Followers: 1)
SIAM Journal on Matrix Analysis and Applications     Hybrid Journal   (Followers: 3)
SIAM Journal on Optimization     Hybrid Journal   (Followers: 12)
Siberian Advances in Mathematics     Hybrid Journal  
Siberian Mathematical Journal     Hybrid Journal  
Sigmae     Open Access  
SILICON     Hybrid Journal  
SN Partial Differential Equations and Applications     Hybrid Journal  
Soft Computing     Hybrid Journal   (Followers: 7)
Statistics and Computing     Hybrid Journal   (Followers: 14)
Stochastic Analysis and Applications     Hybrid Journal   (Followers: 3)
Stochastic Partial Differential Equations : Analysis and Computations     Hybrid Journal   (Followers: 2)
Stochastic Processes and their Applications     Hybrid Journal   (Followers: 6)
Stochastics and Dynamics     Hybrid Journal   (Followers: 2)
Studia Scientiarum Mathematicarum Hungarica     Full-text available via subscription   (Followers: 1)
Studia Universitatis Babeș-Bolyai Informatica     Open Access  
Studies In Applied Mathematics     Hybrid Journal   (Followers: 1)
Studies in Mathematical Sciences     Open Access   (Followers: 1)
Superficies y vacio     Open Access  
Suska Journal of Mathematics Education     Open Access   (Followers: 1)
Swiss Journal of Geosciences     Hybrid Journal   (Followers: 1)
Synthesis Lectures on Algorithms and Software in Engineering     Full-text available via subscription   (Followers: 2)
Synthesis Lectures on Mathematics and Statistics     Full-text available via subscription   (Followers: 1)
Tamkang Journal of Mathematics     Open Access  
Tatra Mountains Mathematical Publications     Open Access  
Teaching Mathematics     Full-text available via subscription   (Followers: 10)
Teaching Mathematics and its Applications: An International Journal of the IMA     Hybrid Journal   (Followers: 4)
Teaching Statistics     Hybrid Journal   (Followers: 8)
Technometrics     Full-text available via subscription   (Followers: 8)
The Journal of Supercomputing     Hybrid Journal   (Followers: 1)
The Mathematica journal     Open Access  
The Mathematical Gazette     Full-text available via subscription   (Followers: 1)
The Mathematical Intelligencer     Hybrid Journal  
The Ramanujan Journal     Hybrid Journal  
The VLDB Journal     Hybrid Journal   (Followers: 2)
Theoretical and Mathematical Physics     Hybrid Journal   (Followers: 7)
Theory and Applications of Graphs     Open Access  
Topological Methods in Nonlinear Analysis     Full-text available via subscription  
Transactions of the London Mathematical Society     Open Access   (Followers: 1)
Transformation Groups     Hybrid Journal  
Turkish Journal of Mathematics     Open Access  
Ukrainian Mathematical Journal     Hybrid Journal  
Uniciencia     Open Access  
Uniform Distribution Theory     Open Access  
Unisda Journal of Mathematics and Computer Science     Open Access  
Unnes Journal of Mathematics     Open Access   (Followers: 1)
Unnes Journal of Mathematics Education     Open Access   (Followers: 2)
Unnes Journal of Mathematics Education Research     Open Access   (Followers: 1)
Ural Mathematical Journal     Open Access  
Vestnik Samarskogo Gosudarstvennogo Tekhnicheskogo Universiteta. Seriya Fiziko-Matematicheskie Nauki     Open Access  
Vestnik St. Petersburg University: Mathematics     Hybrid Journal  
VFAST Transactions on Mathematics     Open Access   (Followers: 1)
Vietnam Journal of Mathematics     Hybrid Journal  
Vinculum     Full-text available via subscription  
Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics     Open Access   (Followers: 2)
Water SA     Open Access   (Followers: 1)
Water Waves     Hybrid Journal  
Zamm-Zeitschrift Fuer Angewandte Mathematik Und Mechanik     Hybrid Journal   (Followers: 1)
ZDM     Hybrid Journal   (Followers: 2)
Zeitschrift für angewandte Mathematik und Physik     Hybrid Journal   (Followers: 2)
Zeitschrift fur Energiewirtschaft     Hybrid Journal  
Zetetike     Open Access  

  First | 1 2 3 4     

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Stochastics and Dynamics
Journal Prestige (SJR): 0.506
Citation Impact (citeScore): 1
Number of Followers: 2  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0219-4937 - ISSN (Online) 1793-6799
Published by World Scientific Homepage  [120 journals]
  • Convergence problem of reduced Ostrovsky equation in Fourier–Lebesgue
           spaces with rough data and random data

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      Authors: Xiangqian Yan, Wei Yan, Yajuan Zhao, Meihua Yang
      Abstract: Stochastics and Dynamics, Ahead of Print.
      This paper is devoted to studying the convergence problem of free reduced Ostrovsky equation in Fourier–Lebesgue spaces with rough data and the stochastic continuity of free reduced Ostrovsky equation in Fourier–Lebesgue spaces with random data. On the one hand, we establish the pointwise convergence related to the free reduced Ostrovsky equation in Fourier–Lebesgue spaces [math] with rough data. In particular, we show that [math] is the necessary condition for the maximal function estimate in [math], which means that [math] is optimal for rough data. On the other hand, we present the stochastic continuity of free reduced Ostrovsky equation at [math] in Fourier–Lebesgue spaces [math] with random data.
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-30T07:00:00Z
      DOI: 10.1142/S0219493723500016
       
  • Continuity and topological structural stability for nonautonomous random
           attractors

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      Authors: Tomás Caraballo, José A. Langa, Alexandre N. Carvalho, Alexandre N. Oliveira-Sousa
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this work, we study the continuity and topological structural stability of attractors for nonautonomous random differential equations obtained by small bounded random perturbations of autonomous semilinear problems. First, we study the existence and permanence of unstable sets of hyperbolic solutions. Then, we use this to establish the lower semicontinuity of nonautonomous random attractors and to show that the gradient structure persists under nonautonomous random perturbations. Finally, we apply the abstract results in a stochastic differential equation and in a damped wave equation with a perturbation on the damping.
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-26T07:00:00Z
      DOI: 10.1142/S021949372240024X
       
  • Space-time fractional Anderson model driven by Gaussian noise rough in
           space

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      Authors: Junfeng Liu, Zhi Wang, Zengwu Wang
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we study a class of space-time fractional Anderson model driven by multiplicative Gaussian noise which is white/colored in time and has the covariance of a fractional Brownian motion with Hurst index [math] in space. We prove the existence of the solution in the Skorohod sense and obtain the upper and lower bounds for the [math]th moments for all [math]. Then we can prove that solution of this equation in the Skorohod sense is weakly intermittent. We also deduce the Hölder continuity of the solution with respect to the time and space variables.
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-26T07:00:00Z
      DOI: 10.1142/S021949372350003X
       
  • Global solution to non-self-adjoint stochastic Volterra equation

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      Authors: Mojtaba Kiyanpour, Bijan Z. Zangeneh, Ruhollah Jahanipur
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we establish the existence and uniqueness of the mild solution for stochastic Volterra equation with a non-self-adjoint operator. The specific Volterra equation that we consider is a generalization of the fractional differential equation. To obtain the mild solution for the case of multiplicative problem, the resolvent property of the linear perturbation of a sectorial operator will be considered.
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-26T07:00:00Z
      DOI: 10.1142/S0219493723500041
       
  • Strong solutions and asymptotic behavior of bidomain equations with random
           noise

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      Authors: Oleksiy Kapustyan, Oleksandr Misiats, Oleksandr Stanzhytskyi
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we study the conditions for the existence of strong solutions (both local and global) for stochastic bidomain equations. To this end, we use a priori energy estimates and Serrin-type theorems. We further address the asymptotic behavior of the solutions, which includes the analysis of small stochastic perturbations and large deviations. In a separate section we specify the support of the invariant measure, whose existence was established in [M. Hieber, O. Misiats and O. Stanzhytskyi, On the bidomain equations driven by stochastic forces, Discrete Contin. Dyn. Syst. 40(11) (2020) 6159–6177].
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-25T07:00:00Z
      DOI: 10.1142/S0219493722500277
       
  • Deviation properties for linear self-attracting diffusion process and
           applications

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      Authors: Hui Jiang, Yajuan Pan
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we study explicitly the deviation properties, including the deviation inequalities and Cramér-type moderate deviations, for some quadratic functionals of linear self-attracting diffusion process. As applications, Cramér-type moderate deviations for the log-likelihood ratio process and drift parameter estimator are obtained. The main methods consist of the deviation inequalities and Cramér-type moderate deviations for multiple Wiener–Itô integrals, as well as the asymptotic analysis techniques.
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-25T07:00:00Z
      DOI: 10.1142/S0219493722500289
       
  • Volterra equations driven by rough signals 2: Higher-order expansions

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      Authors: Fabian A. Harang, Samy Tindel, Xiaohua Wang
      Abstract: Stochastics and Dynamics, Ahead of Print.
      We extend the recently developed rough path theory for Volterra equations from [F. Harang and S. Tindel, Volterra equations driven by rough signals, Stoch. Process. Appl. 142 (2021) 34–78] to the case of more rough noise and/or more singular Volterra kernels. It was already observed in [F. Harang and S. Tindel, Volterra equations driven by rough signals, Stoch. Process. Appl. 142 (2021) 34–78] that the Volterra rough path introduced there did not satisfy any geometric relation, similar to that observed in classical rough path theory. Thus, an extension of the theory to more irregular driving signals requires a deeper understanding of the specific algebraic structure arising in the Volterra rough path. Inspired by the elements of “non-geometric rough paths” developed in [M. Gubinelli, Ramification of rough paths, J. Differential Equations 248 (2010) 693–721; M. Hairer and D. Kelly, Geometric versus non-geometric rough path, Ann. Inst. Henri Poincaré-Probab. Stat. 51 (2015) 207–251], we provide a simple description of the Volterra rough path and the controlled Volterra process in terms of rooted trees, and with this description we are able to solve rough Volterra equations driven by more irregular signals.
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-20T07:00:00Z
      DOI: 10.1142/S0219493723500028
       
  • Regularization of differential equations by two fractional noises

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      Authors: David Nualart, Ercan Sönmez
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we show the existence and uniqueness of a solution for a stochastic differential equation driven by an additive noise which is the sum of two fractional Brownian motions with different Hurst parameters. The proofs are based on the techniques of fractional calculus and Girsanov theorem. In particular, we show that the regularization effect of the fractional Brownian motion with the smaller Hurst index dominates. A key challenge in this paper is to extend and apply the Girsanov theorem for two noises given by the sum of two (dependent) fractional Brownian motions by using profound techniques of fractional operator theory.
      Citation: Stochastics and Dynamics
      PubDate: 2022-07-12T07:00:00Z
      DOI: 10.1142/S0219493722500290
       
  • Large deviations for Hamiltonian systems on intermediate time scales

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      Authors: Shuo Yan
      Abstract: Stochastics and Dynamics, Ahead of Print.
      We consider a two-dimensional Hamiltonian system perturbed by a small diffusion term, whose coefficient is state-dependent and nondegenerate. As a result, the process consists of the fast motion along the level curves and slow motion across them. On finite time intervals, the large deviation principle applies, while on time scales that are inversely proportional to the size of the perturbation, the averaging principle holds, i.e. the projection of the process onto the Reeb graph converges to a Markov process. In our paper, we consider the intermediate time scales and prove the large deviation principle, with the action functional determined in terms of the averaged process on the graph.
      Citation: Stochastics and Dynamics
      PubDate: 2022-06-29T07:00:00Z
      DOI: 10.1142/S0219493722500253
       
  • An example of intrinsic randomness in deterministic PDES

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      Authors: Franco Flandoli, Benjamin Gess, Francesco Grotto
      Abstract: Stochastics and Dynamics, Ahead of Print.
      A new mechanism leading to a random version of Burgers’ equation is introduced: it is shown that the Totally Asymmetric Exclusion Process in discrete time (TASEP) can be understood as an intrinsically stochastic, non-entropic weak solution of Burgers’ equation on [math]. In this interpretation, the appearance of randomness in the Burgers’ dynamics is caused by random additions of jumps to the solution, corresponding to the random effects in TASEP.
      Citation: Stochastics and Dynamics
      PubDate: 2022-06-27T07:00:00Z
      DOI: 10.1142/S0219493722400238
       
  • Existence and concentration of positive solutions to a fractional system
           with saturable term

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      Authors: Menghui Li, Jinchun He, Haoyuan Xu, Meihua Yang
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we consider a fractional Laplacian system with saturable nonlinearity. Under some assumptions on the parameters and potential functions, we obtain the existence and concentration behavior of the positive ground state solution by variational methods.
      Citation: Stochastics and Dynamics
      PubDate: 2022-06-20T07:00:00Z
      DOI: 10.1142/S0219493722500265
       
  • Typical properties of ergodic optimization for asymptotically additive
           potentials

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      Authors: Thiago Bomfim, Rongrong Huo, Paulo Varandas, Yun Zhao
      Abstract: Stochastics and Dynamics, Ahead of Print.
      The space of asymptotically additive potentials is a Banach space and, identifying any two pairs of sequences in terms of their limiting behavior, the quotient space [math] is endowed with a vector space structure. A recent correspondence between additive potentials and classes of asymptotically additive potentials allows us to prove that: (i) the class of asymptotically additive potentials having a unique maximizing measure forms a Baire residual subset of [math], (ii) for transitive hyperbolic homeomorphisms with local product structure, the elements in [math] for which every maximizing measure has full support form a Baire residual subset of [math], and that (iii) for expanding and Anosov maps, the elements in [math] whose unique maximizing measure has zero metric entropy form a Baire residual set of [math]. Further results stating that the maximizing measure is periodic and a number of applications are also discussed.
      Citation: Stochastics and Dynamics
      PubDate: 2022-06-10T07:00:00Z
      DOI: 10.1142/S0219493722500241
       
  • Locally Lipschitz BSDE with jumps and related Kolmogorov equation

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      Authors: K. Abdelhadi, N. Khelfallah
      Abstract: Stochastics and Dynamics, Ahead of Print.
      We study a backward SDE driven by a jump Markov process (BSDEJ for short) whose generator may be locally Lipschitz or of logarithmic growth in [math]-variables. The existence, uniqueness and stability theorems to such BSDEJs are established. We essentially approximate the initial problem by constructing a suitable sequence of BSDEJs with globally Lipschitz generators for which the existence and uniqueness of solutions hold. By passing to the limits, we show the existence and uniqueness of solutions to the original problems. We apply our main results to prove the existence of a unique solution to the Kolmogorov equation of the Markov process.
      Citation: Stochastics and Dynamics
      PubDate: 2022-05-18T07:00:00Z
      DOI: 10.1142/S0219493722500216
       
  • Moderate deviations for stochastic Kuramoto–Sivashinsky equation

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      Authors: Gregory Amali Paul Rose, Murugan Suvinthra, Krishnan Balachandran
      Abstract: Stochastics and Dynamics, Ahead of Print.
      This paper aims to establish the central limit theorem and moderate deviation principle for the stochastic Kuramoto–Sivashinsky equation driven by multiplicative noise on a bounded domain. The moderate deviation principle is investigated using the weak convergence approach based on a variational representation for expected values of positive functionals of the Brownian motion. The approach relies on proving basic qualitative properties of controlled versions of the original stochastic partial differential equation which is under consideration.
      Citation: Stochastics and Dynamics
      PubDate: 2022-05-18T07:00:00Z
      DOI: 10.1142/S021949372250023X
       
  • An optimal control problem for a linear SPDE driven by a multiplicative
           multifractional Brownian motion

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      Authors: Wilfried Grecksch, Hannelore Lisei
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we study the existence of the solution of a linear SPDE driven by a multiplicative multifractional Brownian motion. Moreover, we study an optimal control problem with a linear quadratic objective functional involving the solution of the studied SPDE. We prove the existence and uniqueness of the optimal control.
      Citation: Stochastics and Dynamics
      PubDate: 2022-05-10T07:00:00Z
      DOI: 10.1142/S0219493722400202
       
  • Stochastic n-point D-bifurcations of stochastic Lévy flows and their
           complexity on finite spaces

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      Authors: Paulo Henrique Da Costa, Michael A. Högele, Paulo R. Ruffino
      Abstract: Stochastics and Dynamics, Ahead of Print.
      This paper refines the classical notion of a stochastic D-bifurcation to the respective family of n-point motions for homogeneous Markovian stochastic semiflows, such as stochastic Brownian flows of homeomorphisms, and their generalizations. This notion essentially detects at which level the support of the invariant measure of the k-point bifurcation has more than one connected component. Stochastic Brownian flows and their invariant measures were shown by Kunita (1990) to be rigid, in the sense of being uniquely determined by the [math]-and [math]-point motions. Hence, only stochastic n-point bifurcation of level [math] or [math] can occur. For general homogeneous stochastic Markov semiflows this turns out to be false. This paper constructs minimal examples of where this rigidity is false in general on finite space and studies the complexity of the resulting n-point bifurcations.
      Citation: Stochastics and Dynamics
      PubDate: 2022-05-10T07:00:00Z
      DOI: 10.1142/S0219493722400214
       
  • The continuity, regularity and polynomial stability of mild solutions for
           stochastic 2D-Stokes equations with unbounded delay driven by tempered
           fractional Gaussian noise

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      Authors: Yarong Liu, Yejuan Wang, Tomás Caraballo
      Abstract: Stochastics and Dynamics, Ahead of Print.
      We consider stochastic 2D-Stokes equations with unbounded delay in fractional power spaces and moments of order [math] driven by a tempered fractional Brownian motion (TFBM) [math] with [math] and [math]. First, the global existence and uniqueness of mild solutions are established by using a new technical lemma for stochastic integrals with respect to TFBM in the sense of [math]th moment. Moreover, based on the relations between the stochastic integrals with respect to TFBM and fractional Brownian motion, we show the continuity of mild solutions in the case of [math], [math] or [math], [math]. In particular, we obtain [math]th moment Hölder regularity in time and [math]th polynomial stability of mild solutions. This paper can be regarded as a first step to study the challenging model: stochastic 2D-Navier–Stokes equations with unbounded delay driven by tempered fractional Gaussian noise.
      Citation: Stochastics and Dynamics
      PubDate: 2022-05-10T07:00:00Z
      DOI: 10.1142/S0219493722500228
       
  • Quadratic variation and drift parameter estimation for the stochastic wave
           equation with space-time white noise

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      Authors: Obayda Assaad, Julie Gamain, Ciprian A. Tudor
      Abstract: Stochastics and Dynamics, Ahead of Print.
      We study the quadratic variations (in time and in space) of the solution to the stochastic wave equation driven by the space-time white noise. We give their limit (almost surely and in [math]) and we prove that these variations satisfy, after a proper renormalization, a Central Limit Theorem. We apply the quadratic variation to define and analyze estimators for the drift parameter of the wave equation.
      Citation: Stochastics and Dynamics
      PubDate: 2022-04-29T07:00:00Z
      DOI: 10.1142/S0219493722400147
       
  • On a stochastic nonlocal system with discrete diffusion modeling life
           tables

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      Authors: Tomás Caraballo, Francisco Morillas, José Valero
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we study a stochastic system of differential equations with nonlocal discrete diffusion. For two types of noises, we study the existence of either positive or probability solutions. Also, we analyze the asymptotic behavior of solutions in the long term, showing that under suitable assumptions they tend to a neighborhood of the unique deterministic fixed point. Finally, we perform numerical simulations and discuss the application of the results to life tables for mortality in Spain.
      Citation: Stochastics and Dynamics
      PubDate: 2022-04-18T07:00:00Z
      DOI: 10.1142/S0219493722400172
       
  • Analysis of a new stochastic Gompertz diffusion model for untreated human
           glioblastomas

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      Authors: Tuan Anh Phan, Shuxun Wang, Jianjun Paul Tian
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we analyze a new Ito stochastic differential equation model for untreated human glioblastomas. The model was the best fit of the average growth and variance of 94 pairs of a data set. We show the existence and uniqueness of solutions in the positive spatial domain. When the model is restricted in the finite domain [math], we show that the boundary point 0 is unattainable while the point [math] is reflecting attainable. We prove there is a unique ergodic stationary distribution for any non-zero noise intensity, and obtain the explicit probability density function for the stationary distribution. By using Brownian bridge, we give a representation of the probability density function of the first passage time when the diffusion process defined by a solution passes the point [math] firstly. We carry out numerical studies to illustrate our analysis. Our mathematical and numerical analysis confirms the soundness of our randomization of the deterministic model in that the stochastic model will set down to the deterministic model when the noise intensity approaches zero. We also give physical interpretation of our stochastic model and analysis.
      Citation: Stochastics and Dynamics
      PubDate: 2022-03-21T07:00:00Z
      DOI: 10.1142/S0219493722500198
       
  • On the stability of mean-field stochastic differential equations with
           irregular expectation functional

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      Authors: Oussama Elbarrimi
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we consider multidimensional mean-field stochastic differential equations where the coefficients depend on the law in the form of a Lebesgue integral with respect to the measure of the solution. Under the pathwise uniqueness property, we establish various strong stability results. As a consequence, we give an application for optimal control of diffusions. Namely, we propose a result on the approximation of the solution associated to a relaxed control.
      Citation: Stochastics and Dynamics
      PubDate: 2022-03-15T07:00:00Z
      DOI: 10.1142/S0219493722500204
       
  • Optimal index and averaging principle for Itô–Doob stochastic
           fractional differential equations

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      Authors: Wenya Wang, Zhongkai Guo
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, a class of Itô–Doob stochastic fractional differential equations (Itô–Doob SFDEs) models are discussed. Using the time scale transformation method, we consider the averaging principle of the transformed equations and establish the relevant results. At the same time, we find that the optimal index for the original Itô–Doob SFDEs can be determined, the selection of such index is similar to the classical stochastic differential equations model.
      Citation: Stochastics and Dynamics
      PubDate: 2022-02-25T08:00:00Z
      DOI: 10.1142/S0219493722500186
       
  • A stochastic Sir epidemic evolution model with non-concave force of
           infection: Mathematical modeling and analysis

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      Authors: A. Lahrouz, A. Settati, M. Jarroudi, H. Mahjour, M. Fatini, M. Merzguioui, A. Tridane
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we revisit the classical SIR epidemic model by replacing the simple bilinear transmission rate by a nonlinear one. Our results show that in the presence of environmental fluctuations represented by Brownian motion and that mainly act on the transmission rate, the generalized non-concave force of infection adopted here, greatly affects the long-time behavior of the epidemic. Employing the Markov semigroup theory, we prove that the model solutions do not admit a unique stationary distribution but converge to 0 in [math]th moment for any [math]. Furthermore, we prove that the disease extinguishes asymptotically exponentially with probability 1 without any restriction on the model parameters and we also determine the rate of convergence. This is an unexpected qualitative behavior in comparison with the existing literature where the studied epidemic models have a threshold dynamics behavior. It is also a very surprising behavior regarding the deterministic counterpart that can exhibit a rich qualitative dynamical behaviors such as backward bifurcation and Hopf bifurcation. On the other hand, we show by several numerical simulations that as the intensity of environmental noises becomes sufficiently small, the epidemic tends to persist for a very long time before dying out from the host population. To solve this problem and to be able to manage the pre-extinction period, we construct a new process in terms of the number of infected and recovered individuals which admits a unique invariant stationary distribution. Finally, we discuss the obtained analytical results through a series of numerical simulations.
      Citation: Stochastics and Dynamics
      PubDate: 2022-01-26T08:00:00Z
      DOI: 10.1142/S0219493722500162
       
  • Existence of solutions for mean-field integrodifferential equations with
           delay

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      Authors: Moustapha Dieye, Amadou Diop, Mark A. Mckibben
      Abstract: Stochastics and Dynamics, Ahead of Print.
      In this paper, we study the existence and continuous dependence on coefficients of mild solutions for first-order McKean–Vlasov integrodifferential equations with delay driven by a cylindrical Wiener process using resolvent operator theory and Wasserstein distance. Under the situation that the nonlinear term depends on the probability distribution of the state, the existence and uniqueness of solutions are established. An example illustrating the general results is included.
      Citation: Stochastics and Dynamics
      PubDate: 2022-01-26T08:00:00Z
      DOI: 10.1142/S0219493722500174
       
 
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