This is the home page of libkww, a small numeric library that provides the cosine and sine Fourier transform of Kohlrauch's stretched exponential function exp(-t^beta).
This Fourier transform is also known as the Kohlrausch-Williams-Watts function. In condensed-matter physics, it is often used to describe frequency-domain measurements of relaxation processes.
Laplace–Fourier Transform of the Stretched Exponential Function: Analytic Error Bounds, Double Exponential Transform, and Open-Source Implementation “libkww”.
Algorithms 5, 604-628 (2012)