一类超几何函数扰动级数的闭式和
Closed-form sums for some perturbation series involving hypergeometric functions
摘要:
Sum{n=1,infinity}(alpha/2)_n_2F_1(-n,b; gamma; y)/(n n!)被调查。对于α为正整数α = 1,2,3,. b --> infinity的极限情况,在y被x^2/b替换后,导致Sum{n=1,infinity}(alpha/2)_n_1F_1(-n; gamma; x^2)/(n n!)。这类级数出现在广义尖峰谐振子哈密顿量H = -(d/dx)^2 + Bx^2 + A/x^2 + lambda/x^alpha,x >=0,alpha,lambda > 0,A >= 0的波函数的一阶微扰修正中。这些结果对于尖峰谐振子哈密顿量H = -(d/dx)^2 + Bx^2 + lambda/x^alpha,x >= 0,alpha,lambda > 0的能量和波函数的微扰级数有直接的应用。
英文摘要:
Infinite series of the type Sum{n=1,infinity}(alpha/2)_n_2F_1(-n, b; gamma; y)/(n n!) are investigated. Closed-form sums are obtained for alpha a positive integer alpha=1,2,3, ... The limiting case of b --> infinity, after y is replaced with x^2/b, leads to Sum{n=1,infinity}(alpha/2)_n_1F_1(-n; gamma; x^2)/(n n!). This type of series appears in the first-order perturbation correction for the wavefunction of the generalized spiked harmonic oscillator Hamiltonian H = -(d/dx)^2 + Bx^2 + A/x^2 + lambda/x^alpha, x >=0, alpha, lambda > 0, A >= 0. These results have immediate applications to perturbation series for the energy and wave function of the spiked harmonic oscillator Hamiltonian H = -(d/dx)^2 + Bx^2 + lambda/x^alpha, x >= 0, alpha, lambda > 0.
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