Long-range potential scattering: Converting long-range potential to short-range potential by tortoise coordinate
Abstract
Inspired by general relativity, we suggest an approach for long-range potential scattering. In scattering theory, there is a general theory for short-range potential scattering, but there is no general theory for long-range potential scattering. This is because the scattering boundary conditions for all short-range potentials are the same, but for different long-range potentials are different. In this paper, by introducing tortoise coordinates, we convert long-range potential scattering to short-range potential scattering. This allows us to deal with long-range potential scattering as short-range potential scattering. An explicit expression of the scattering wave function for long-range potential scattering is presented, in which the scattering wave function is represented by the tortoise coordinate and the scattering phase shift. We show that the long-range potential scattering wave function is just the short-range potential scattering wave function with a replacement of a common coordinate by a tortoise coordinate. The approach applies not only to scattering but also applies to bound states. Furthermore, in terms of tortoise coordinates, we suggest a classification scheme for potentials. We also discuss the duality between tortoise coordinates.
Cite
@article{arxiv.1802.05245,
title = {Long-range potential scattering: Converting long-range potential to short-range potential by tortoise coordinate},
author = {Wen-Du Li and Wu-Sheng Dai},
journal= {arXiv preprint arXiv:1802.05245},
year = {2021}
}