arXiv subjects

Yoon Seok Choun

Publications and source records attributed to Yoon Seok Choun.

12 recordsLinked to original sources

arXiv2019

Complete polynomials using 3-term and reversible 3-term recurrence formulas (3TRF and R3TRF)

In the first series "Special functions and three term recurrence formula (3TRF)", I show how to obtain power series solutions of Heun, Grand Confluent Hypergeoemtric (GCH), Mathieu and Lame equations for an infinite series and a polynomial of type 1. The method of proof for an infinite series and a polynomial of type 1 in the 3-term recurrence relation is called as three term recurrence formula (3TRF). And integral forms and generating functions of the above 4 equations are constructed analytically. In the second series "Special functions and reversible three-term recurrence formula (R3TRF)", I show how to obtain (1) power series solutions, (2) integral solutions and (3) generating functions of 5 equations (Heun, GCH, Mathieu, Lame and Confluent Heun (CH) equations) for an infinite series and a polynomial of type 2. The method of proof for an infinite series and a polynomial of type 2 in the 3-term recurrence relation is called as reversible three term recurrence formula (R3TRF). In this series I show how to obtain the mathematical formula for a polynomial of type 3, designated as "complete polynomial." The complete polynomial has two different types which are (1) the first species complete polynomial and (2) the second species complete polynomial. The former is applicable if there are only one eigenvalue in B_n term and an eigenvalue in A_n term. And the latter is applicable if there are two eigenvalues in B_n term and an eigenvalue in A_n term. By applying 3TRF and R3TRF, I generalize the 3-term recurrence relation in 5 equations (Heun, GCH, Lame, CH and Double Confluent Heun equations) for complete polynomials of two types in the form of a power series expansion.

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arXiv2015

Lame equation in the algebraic form

Lame equation arises from deriving Laplace equation in ellipsoidal coordinates; in other words, it's called ellipsoidal harmonic equation. Lame functions are applicable to diverse areas such as boundary value problems in ellipsoidal geometry, chaotic Hamiltonian systems, the theory of Bose-Einstein condensates, etc. In this paper I will apply three term recurrence formula [arXiv:1303.0806] to the power series expansion in closed forms of Lame function in the algebraic form(infinite series and polynomial) and its integral forms including all higher terms of A_n's. I will show how to transform power series expansion of Lame function to an integral formalism mathematically for cases of infinite series and polynomial. One interesting observation resulting from the calculations is the fact that a Gauss Hypergeometric function recurs in each of sub-integral forms: the first sub-integral form contains zero term of A_n's, the second one contains one term of A_n's, the third one contains two terms of A_n's, etc. Section 6 contains additional examples of application in Lame function. This paper is 6th out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 7 for all the papers in the series. Previous paper in series deals with the power series expansion of Mathieu function and its integral formalism [arXiv:1303.0820]. The next paper in the series describes the power series and integral forms of Lame equation in the Weierstrass's form and its asymptotic behaviors [arXiv:1303.0878].

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arXiv2015

Asymptotic behavior of Heun function and its integral formalism

The Heun function generalizes all well-known special functions such as Spheroidal Wave, Lame, Mathieu, and hypergeometric functions. Heun functions are applicable to diverse areas such as theory of black holes, lattice systems in statistical mechanics, solution of the Schrodinger equation of quantum mechanics, and addition of three quantum spins. In this paper, applying three term recurrence formula, I consider asymptotic behaviors of Heun function and its integral formalism including all higher terms of A_n's. I will show how the power series expansion of Heun functions can be converted to closed-form integrals for all cases of infinite series and polynomial. One interesting observation resulting from the calculations is the fact that a Gauss hypergeometric function recurs in each of sub-integral forms: the first sub-integral form contains zero term of A_n's, the second one contains one term of A_n's, the third one contains two terms of A_n's, etc. In the appendix, I apply the power series expansion and my integral formalism of Heun function to "The 192 solutions of the Heun equation." Due to space restriction final equations for all 192 Heun functions is not included in the paper, but feel free to contact me for the final solutions. Section 5 contains two additional examples using integral forms of Huen function. This paper is 4th out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 5 for all the papers in the series. The previous paper in series deals with the power series expansion in closed forms of Heun function. The next paper in the series describes analytically the power series expansion of Mathieu function and its integral formalism.

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arXiv2015

Power series and integral forms of Lame equation in Weierstrass's form

I consider the power series expansion of Lame function in the Weierstrass's form and its integral forms applying three term recurrence formula[1]. I investigate asymptotic expansions of Lame function for the cases of infinite series and polynomials. I will show how the power series expansion of Lame functions in the Weierstrass's form can be converted to closed-form integrals for all cases of infinite series and polynomial. One interesting observation resulting from the calculations is the fact that a Gauss hypergeometric function recurs in each of sub-integral forms: the first sub-integral form contains zero term of A_n's, the second one contains one term of A_n's, the third one contains two terms of A_n's, etc. This paper is 7th out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 7 for all the papers in the series. Previous paper in series deals with the power series expansion and the integral formalism of Lame equation in the algebraic form and its asymptotic behavior[19]. The next paper in the series describes the generating functions of Lame equation in the Weierstrass's form[21]. Nine examples of 192 local solutions of the Heun equation (Maier, 2007) are provided in the appendix. For each example, I show how to convert local solutions of Heun equation by applying 3TRF to analytic solutions of Lame equation in Weierstrass's form.

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arXiv2014

The generating functions of Lame equation in Weierstrass's form

Lame equation arises from deriving Laplace equation in ellipsoidal coordinates; in other words, it's called ellipsoidal harmonic equation. Lame function is applicable to diverse areas such as boundary value problems in ellipsoidal geometry, chaotic Hamiltonian systems, the theory of Bose-Einstein condensates, etc. By applying generating function into modern physics (quantum mechanics, thermodynamics, black hole, supersymmetry, special functions, etc), we are able to obtain the recursion relation, a normalization constant for the wave function and expectation values of any physical quantities. For the case of hydrogen-like atoms, generating function of associated Laguerre polynomial has been used in order to derive expectation values of position and momentum. By applying integral forms of Lame polynomial in the Weierstrass's form in which makes B_n term terminated [29], I consider generating function of it including all higher terms of A_n's. This paper is 8th out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 4 for all the papers in the series. Previous paper in series deals with the power series expansion and the integral formalism of Lame equation in the Weierstrass's form and its asymptotic behavior [29]. The next paper in the series describes analytic solution for grand confluent hypergeometric function [31].

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arXiv2014

Approximative solution of the spin free Hamiltonian involving only scalar potential for the quark-antiquark system

In earlier papers [3,4,5,6] Gursey et al. showed development of a bilocal baryon-meson field from two quark-antiquark fields. The Hamiltonian in the case of vanishing quark masses was shown to have a very good agreement with experiments [5]. The theory for vanishing mass was solved using Confluent Hypergeometric functions [6]. In this paper I construct the normalized wave function for the spin-free Hamiltonian with light quark masses (only up to the first order of the mass of quark). I develop the new kind of special function theory in mathematics that generalize all existing theories of Confluent Hypergeometric types. I call it the 'Grand Confluent Hypergeometric (GCH) Function.' My solution produces previously unknown extra "hidden" radial quantum numbers relevant for description of supersymmetry and for generating new mass formulas. This paper is 1st out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 6 for all the papers in the series. The next paper in the series describes generalization of three term recurrence relation in linear ordinary differential equations and its applications [8].

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arXiv2014

Generalization of the three-term recurrence formula and its applications

The history of linear differential equations is over 350 years. By using Frobenius method and putting the power series expansion into linear differential equations, the recursive relation of coefficients starts to appear. There can be between two and infinity number of coefficients in the recurrence relation in the power series expansion. During this period mathematicians developed analytic solutions of only two term recursion relation in closed forms. Currently the analytic solution of three term recurrence relation is unknown. In this paper I will generalize the three term recurrence relation in the linear differential equation. This paper is 2nd out of 10 in series "Special functions and three term recurrence formula (3TRF)". The next paper in series deals with the power series expansion in closed forms of Heun function by Choun [arXiv:1303.0830]. The rest of the papers in the series show how to solve mathematical equations having three term recursion relations and go on producing the exact solutions of some of the well known special functions including: Mathieu, Heun, Biconfluent Heun and Lame equations. See section IX for all the papers and short descriptions in the series.

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arXiv2014

Analytic solution for grand confluent hypergeometric function

In previous paper I construct an approximative solution of the power series expansion in closed forms of Grand Confluent Hypergeometric (GCH) function only up to one term of A_n's [4]. And I obtain normalized constant and orthogonal relation of GCH function. In this paper I will apply three term recurrence formula [3] to the power series expansion in closed forms of GCH function (infinite series and polynomial) including all higher terms of A_n's. In general most of well-known special function with two recursive coefficients only has one eigenvalue for the polynomial case. However this new function with three recursive coefficients has infinite eigenvalues that make B_n's term terminated at specific value of index n because of three term recurrence formula [3]. This paper is 9th out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 6 for all the papers in the series. Previous paper in series deals with generating functions of Lame polynomial in the Weierstrass's form [28]. The next paper in the series describes the integral formalism and the generating function of GCH function [30].

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arXiv2014

The integral formalism and the generating function of grand confluent hypergeometric function

Biconfluent Heun (BCH) function, a confluent form of Heun function, is the special case of Grand Confluent Hypergeometric (GCH) function: this has a regular singularity at x=0, and an irregular singularity at infinity of rank 2. In this paper I apply three term recurrence formula (3TRF) [arXiv:1303.0806] to the integral formalism of GCH function including all higher terms of A_n's and the generating function for the GCH polynomial which makes B_n term terminated. I show how to transform power series expansion in closed forms of GCH equation to its integral representation analytically. This paper is 10th out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 6 for all the papers in the series. The previous paper in the series describes the power series expansion in closed forms of GCH equation and its asymtotic behaviours. [arXiv:1303.0813]

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arXiv2014

The power series expansion of Mathieu function and its integral formalism

Mathieu ordinary differential equation is of Fuchsian types with the two regular and one irregular singularities. In contrast, Heun equation of Fuchsian types has the four regular singularities. Heun equation has the four kind of confluent forms: (1) Confluent Heun (two regular and one irregular singularities), (2) Doubly confluent Heun (two irregular singularities), (3) Biconfluent Heun (one regular and one irregular singularities), (4) Triconfluent Heun equations (one irregular singularity). Mathieu equation in algebraic forms is also derived from the Confluent Heun equation by changing all coefficients. In this paper I apply three term recurrence formula [arXiv:1303.0806] to the power series expansion in closed forms of Mathieu equation for infinite series and its integral forms including all higher terms of A_n's. One interesting observation resulting from the calculations is the fact that a modified Bessel function recurs in each of sub-integral forms: the first sub-integral form contains zero term of A_n's, the second one contains one term of A_n's, the third one contains two terms of A_n's, etc. Section 5 contains two additional examples of Mathieu function. This paper is 5th out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 6 for all the papers in the series. Previous paper in series deals with asymptotic behavior of Heun function and its integral formalism [arXiv:1303.0876]. The next paper in the series describes the power series expansion in closed forms of Lame equation in the algebraic form and its integral forms [arXiv:1303.0873].

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arXiv2014

Special functions and reversible three-term recurrence formula (R3TRF)

In the previous series "Special functions and three term recurrence formula (3TRF)", I generalize the three term recurrence relation in the linear differential equation for the infinite series and polynomial which makes B_n term terminated including all higher terms of A_n's. In this series I will show how to obtain the formula for the polynomial which makes A_n term terminated including all higher terms of B_n's and infinite series of its power series expansion. In the future series I will show you for the polynomial which makes A_n and B_n terms terminated at same time; the power series, integral formalism and generating function such as Heun, Mathieu, Lame and GCH equations will be constructed analytically. In chapter 1, I will generalize the three term recurrence relation in linear differential equation in a backward for the infinite series and polynomial which makes A_n term terminated including all higher terms of B_n's. In chapters 2-9, I will apply reversible three term recurrence formula to (1) the power series expansion in closed forms, (2) its integral representation and (3) generating functions of Heun, Confluent Heun, GCH, Lame and Mathieu equations that consist of three term recursion relation for the infinite series and polynomial which makes A_n term terminated.

math.CA↗

arXiv2014

The analytic solution for the power series expansion of Heun function

The Heun function generalizes all well-known special functions such as Spheroidal Wave, Lame, Mathieu, and hypergeometric_2F_1,_1F_1 and_0F_1 functions. Heun functions are applicable to diverse areas such as theory of black holes, lattice systems in statistical mechanics, solution of the Schrodinger equation of quantum mechanics, and addition of three quantum spins. In this paper I will apply three term recurrence formula (Choun, Y.S., arXiv:1303.0806., 2013) to the power series expansion in closed forms of Heun function (infinite series and polynomial) including all higher terms of A_n's. Section three contains my analysis on applying the power series expansions of Heun function to a recent paper. (R.S. Maier, Math. Comp. 33, 2007) Due to space restriction final equations for the 192 Heun functions are not included in the paper, but feel free to contact me for the final solutions. Section four contains two additional examples using the power series expansions of Heun function. This paper is 3rd out of 10 in series "Special functions and three term recurrence formula (3TRF)". See section 5 for all the papers in the series. The previous paper in series deals with three term recurrence formula (3TRF). The next paper in the series describes the integral forms of Heun function and its asymptotic behaviors analytically.

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