Abstract:In this paper we present an algebraic study concerning the general second order linear differential equation with polynomial coefficients. By means of Kovacic's algorithm and asymptotic iteration method we find a degree independent algebraic description of the spectral set: the subset, in the parameter space, of Liouville integrable differential equations. For each fixed degree, we prove that the spectral set is a countable union of non accumulating algebraic varieties. This algebraic description of the spectr… Show more
“…Algebraic Methods. Concerning algebraic aspects considered in this paper, we follow the references [16,17,18,19,20,21,22,23,24,25,26,27,28,29,30] and also [1,2,3,4,5,6].…”
This article reveals an analysis of the quadratic systems that hold multiparametric families therefore, in the first instance the quadratic systems are identified and classified in order to facilitate their study and then the stability of the critical points in the finite plane, its bifurcations, stable manifold and lastly, the stability of the critical points in the infinite plane, afterwards the phase portraits resulting from the analysis of these families are graphed. To properly perform this study it was necessary to use some results of the non-linear systems theory, for this reason vital definitions and theorems were included because of their importance during the study of the multiparametric families. Algebraic aspects are also included.
“…Algebraic Methods. Concerning algebraic aspects considered in this paper, we follow the references [16,17,18,19,20,21,22,23,24,25,26,27,28,29,30] and also [1,2,3,4,5,6].…”
This article reveals an analysis of the quadratic systems that hold multiparametric families therefore, in the first instance the quadratic systems are identified and classified in order to facilitate their study and then the stability of the critical points in the finite plane, its bifurcations, stable manifold and lastly, the stability of the critical points in the infinite plane, afterwards the phase portraits resulting from the analysis of these families are graphed. To properly perform this study it was necessary to use some results of the non-linear systems theory, for this reason vital definitions and theorems were included because of their importance during the study of the multiparametric families. Algebraic aspects are also included.
Esta tesis versa sobre el punto de vista desde la Teoría de Galois Diferencial hacia la mecánica cuántica supersimétrica. El objeto principal considerado aquí es la ecuación deSchrödinger estacionaria no relativista, especialmente los casos integrables en el sentido de la teoría de Picard-Vessiot theory y las principales herramientas algorítmicas utilizadas aquí son el algoritmo de Kovacic y el método de la algebrización para obtener ecuaciones diferenciales lineales con coeficientes racionales.
Analizamos las transformaciones de Darboux, la iteración de Crum y la mecánica cuántica supersimétrica con sus versiones algebrizadas desde un acercamiento Galoisiano.
Aplicando el método de la algebrización y el algoritmo de Kovacic obtenemos el estado
base, las funciones propias, los valores propios los grupos de Galois diferenciales y los
anillos propios de algunas ecuaciones de Schrödinger con potenciales tales como
exactamente resoluble y potenciales de forma invariante. Finalmente, introducimos una metodología para buscar potenciales exactamente resolubles.
Para construir otros
potenciales, aplicamos el método de la algebrización en forma inversa, desde ecuaciones diferenciales que tengan polinomios ortogonales y funciones especiales como soluciones
This paper is devoted to a complete parametric study of Liouvillian solutions of the general trace-free second order differential equation with a Laurent polynomial coefficient. This family of equations, for fixed orders at 0 and $$\infty$$
∞
of the Laurent polynomial, is seen as an affine algebraic variety. We prove that the set of Picard-Vessiot integrable differential equations in the family is an enumerable union of algebraic subvarieties. We compute explicitly the algebraic equations of its components. We give some applications to well known subfamilies, such as the doubly confluent and biconfluent Heun equations, and to the theory of algebraically solvable potentials of Shrödinger equations. Also, as an auxiliary tool, we improve a previously known criterium for a second order linear differential equations to admit a polynomial solution.
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