Heun equation

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1: 31.2 Differential Equations

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§31.2(i) Heun’s Equation

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31.2.1 $$\frac{d^{2}w}{{dz}^2}+\left(\frac{\gamma }{z}+\frac{\delta }{z-1}+\frac{ϵ}{z-a}\right)\frac{dw}{dz}+\frac{\alpha \beta z-q}{z(z-1)(z-a)}w=0,$$ $\alpha +\beta +1=\gamma +\delta +ϵ$.

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Symbols:

$\frac{df}{dx}$: derivative of $f$ with respect to $x$ , $z$: complex variable, $\gamma$: real or complex parameter, $\delta$: real or complex parameter, $ϵ$: real or complex parameter, $a$: complex parameter, $q$: real or complex parameter, $\alpha$: real or complex parameter and $\beta$: real or complex parameter

Referenced by:

§29.2(ii), §31.11(iii), §31.12, §31.13, §31.14(i), §31.17(i), §31.18, §31.2(v), §31.2(v), §31.2(v), §31.2(i), §31.3(i), §31.3(i), §31.3(ii), §31.3(ii), §31.3(ii), §31.3(iii), §31.3(iii), §31.4, §31.5, §31.6, §31.7(ii), §31.8, §31.8, §31.8

Permalink:

http://dlmf.nist.gov/31.2.E1

Encodings:

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See also:

Annotations for §31.2(i), §31.2 and Ch.31

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§31.2(ii) Normal Form of Heun’s Equation

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§31.2(v) Heun’s Equation Automorphisms

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Composite Transformations

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2: 31.12 Confluent Forms of Heun’s Equation

§31.12 Confluent Forms of Heun’s Equation

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Confluent Heun Equation

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Doubly-Confluent Heun Equation

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Biconfluent Heun Equation

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Triconfluent Heun Equation

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3: 31.13 Asymptotic Approximations

§31.13 Asymptotic Approximations

… ►For asymptotic approximations of the solutions of Heun’s equation (31.2.1) when two singularities are close together, see Lay and Slavyanov (1999). ►For asymptotic approximations of the solutions of confluent forms of Heun’s equation in the neighborhood of irregular singularities, see Komarov et al. (1976), Ronveaux (1995, Parts B,C,D,E), Bogush and Otchik (1997), Slavyanov and Veshev (1997), and Lay et al. (1998).

4: 31.1 Special Notation

… ►Sometimes the parameters are suppressed.

5: Gerhard Wolf

… ► Schmidt) of the Chapter Double Confluent Heun Equation in the book Heun’s Differential Equations (A. …

6: 31.17 Physical Applications

§31.17 Physical Applications

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§31.17(i) Addition of Three Quantum Spins

… ►Heun functions appear in the theory of black holes (Kerr (1963), Teukolsky (1972), Chandrasekhar (1984), Suzuki et al. (1998), Kalnins et al. (2000)), lattice systems in statistical mechanics (Joyce (1973, 1994)), dislocation theory (Lay and Slavyanov (1999)), and solution of the Schrödinger equation of quantum mechanics (Bay et al. (1997), Tolstikhin and Matsuzawa (2001), and Hall et al. (2010)). ►For applications of Heun’s equation and functions in astrophysics see Debosscher (1998) where different spectral problems for Heun’s equation are also considered. …

7: Brian D. Sleeman

… ► thesis was Some Boundary Value Problems Associated with the Heun Equation. …

8: 31.14 General Fuchsian Equation

… ►Heun’s equation (31.2.1) corresponds to $N=3$. ►

Normal Form

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9: 31.18 Methods of Computation

§31.18 Methods of Computation

… ►The computation of the accessory parameter for the Heun functions is carried out via the continued-fraction equations (31.4.2) and (31.11.13) in the same way as for the Mathieu, Lamé, and spheroidal wave functions in Chapters 28–30.

10: 31.10 Integral Equations and Representations

§31.10 Integral Equations and Representations

… ►If $w(z)$ is a solution of Heun’s equation, then another solution $W(z)$ (possibly a multiple of $w(z)$) can be represented as … ►

Kernel Functions

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Kernel Functions

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