Marchenko equation

In mathematical physics, more specifically the one-dimensional inverse scattering problem, the Marchenko equation (or Gelfand-Levitan-Marchenko equation or GLM equation), named after Israel Gelfand, Boris Levitan and Vladimir Marchenko, is derived by computing the Fourier transform of the scattering relation:

${\displaystyle K(r,r^{\prime })+g(r,r^{\prime })+\int _{r}^{\infty }K(r,r^{\prime \prime })g(r^{\prime \prime },r^{\prime })\mathrm {d} r^{\prime \prime }=0}$

Where ${\displaystyle g(r,r^{\prime })\,}$is a symmetric kernel, such that ${\displaystyle g(r,r^{\prime })=g(r^{\prime },r),\,}$which is computed from the scattering data. Solving the Marchenko equation, one obtains the kernel of the transformation operator ${\displaystyle K(r,r^{\prime })}$ from which the potential can be read off. This equation is derived from the Gelfand–Levitan integral equation, using the Povzner–Levitan representation.