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Asymptotic behavior of the integral of Hermite functions/polynomials on half-lines

Your conjecture is not true. Moreover, $$J_m(y):=\int_y^\infty dx\, e^{-x^2}H_m(x)^2\sim c_m:=\frac12\,\pi^{1/2}\,2^m m! \tag{1}\label{1}$$ whenever $$0\le y=o(m^{1/2}).$$ Indeed, recalling that $H_m^...
Iosif Pinelis's user avatar
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Asymptotic behavior of the integral of Hermite functions/polynomials on half-lines

Let me first consider the case $x_0=0$, when the integral has a closed form expression: $$\int^{\infty}_{0}|H_m(x)|^2 e^{-x^2}\,dx=\sqrt{\pi } \,2^{m-1} m!\;\;(m\in\mathbb{N}).$$ See, for example, ...
Carlo Beenakker's user avatar

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