Linearized Boltzmann collision operator: II. Polyatomic molecules modeled by a continuous internal energy variable [PDF]
Kinetic and Related Models, 2022 The linearized collision operator of the Boltzmann equation for single species can be written as a sum of a positive multiplication operator, the collision frequency, and a compact integral operator. This classical result has more recently, been extended
Niclas Bernhoff
semanticscholar +1 more source
Fredholm property of the linearized Boltzmann operator for a polyatomic single gas model [PDF]
Kinetic and Related Models, 2022 In the following work, we consider the Boltzmann equation that models a polyatomic gas by representing the microscopic internal energy by a continuous variable I.
S. Brull, Marwa Shahine, P. Thieullen
semanticscholar +1 more source
On the Mass Dependence of the Modular Operator for a Double Cone [PDF]
Annales de l'Institute Henri Poincare. Physique theorique, 2022 We present a numerical approximation scheme for the Tomita–Takesaki modular operator of local subalgebras in linear quantum fields, working at one-particle level.
Henning Bostelmann +2 more
semanticscholar +1 more source
Conditional-mean multiplicative operator models for count time series [PDF]
Computational Statistics & Data Analysis, 2022 Multiplicative error models (MEMs) are commonly used for real-valued time series, but they cannot be applied to discrete-valued count time series as the involved multiplication would not preserve the integer nature of the data.
C. Weiß, Fukang Zhu
semanticscholar +1 more source
Grand Lorentz sequence space and its multiplication operator
, 2020 In this paper, we introduce the grand Lorentz sequence spaces l_{p,q)}^{θ} and study on some topological properties. Also, we characterize some properties of the multiplication operator, such as compactness, Fredholmness etc., defined on l_{p,q)}^{θ}.
Oğuz Oğur
semanticscholar +1 more source
Multiples of hypercyclic operators [PDF]
Proceedings of the American Mathematical Society, 2008 We give a negative answer to a question of Prăjitură by showing that there exists an invertible bilateral weighted shift T T on ℓ 2 ( Z ) \ell _2(\mathbb {Z}) such that T T and 3 T 3T are ...
Badea, Catalin +2 more
openaire +4 more sources
Isometric multiplication operators and weighted composition operators of BMOA
Journal of Inequalities and Applications, 2021 Let u be an analytic function in the unit disk D $\mathbb{D}$ and φ be an analytic self-map of D $\mathbb{D}$ . We give characterizations of the symbols u and φ for which the multiplication operator M u $M_{u}$ and the weighted composition operator M u ,
Ligang Geng
doaj +1 more source
Multiplication Operators on Cesàro Sequence Spaces
Demonstratio Mathematica, 2016 In this paper we characterize the compact, invertible and Fredholm multiplication operators on Cesàro sequence spaces.
Komal B. S., Pandoh Suruchi, Raj Kuldip
doaj +1 more source
Hypercyclicity of Composition Operators on Orlicz Function Spaces
Moroccan Journal of Pure and Applied Analysis, 2020 In this paper, we discuss the hypercyclic properties of composition operators on Orlicz function spaces. We give some different conditions under which a composition operator on Orlicz spaces is hyper-cyclic or not. Similarly, multiplication operators are
Jafari F., Kamali Z.
doaj +1 more source
On dB spaces with nondensely defined multiplication operator and the existence of zero-free functions [PDF]
, 2014 In this work we consider de Branges spaces where the multiplication operator by the independent variable is not densely defined. First, we study the canonical selfadjoint extensions of the multiplication operator as a family of rank-one perturbations ...
Silva, Luis O., Toloza, Julio H.
core +2 more sources