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On the Herman-Kluk Semiclassical Approximation

For a subquadratic symbol $H$ on $\R^d\times\R^d = T^*(\R^d)$, the quantum propagator of the time dependent Schrödinger equation $i\hbar\frac{\partialψ}{\partial t} = \hat Hψ$ is a Semiclassical Fourier-Integral Operator when $\hat H=H(x,\hbar D_x)$ ($\hbar$-Weyl quantization of $H$). Its Schwartz kernel is describe by a quadratic phase and an amplitude. At every time $t$, when $\hbar$ is small, it is &#34;essentially supported&#34; in a neighborhood of the graph of the classical flow generated by $H$, with a full uniform asymptotic expansion in $\hbar$ for the amplitude. In this paper our goal is to revisit this well known and fondamental result with emphasis on the flexibility for the choice of a quadratic complex phase function and on global $L^2$ estimates when $\hbar$ is small and time $t$ is large. One of the simplest choice of the phase is known in chemical physics as Herman-Kluk formula. Moreover we prove that the semiclassical expansion for the propagator is valid for $| t| << \frac{1}{4δ}|\log\hbar|$ where $δ>0$ is a stability parameter for the classical system.