Long-range potential scattering: Converting long-range potential to short-range potential by tortoise coordinate

TL;DR

This paper introduces a novel method inspired by general relativity that uses tortoise coordinates to transform long-range potential scattering problems into short-range ones, enabling the application of existing theories and simplifying analysis.

Contribution

The paper proposes a new approach using tortoise coordinates to convert long-range potential scattering into short-range scattering, facilitating analysis and classification.

Findings

Explicit expression for long-range scattering wave function using tortoise coordinates

Demonstrates equivalence of long-range and short-range scattering wave functions with coordinate transformation

Suggests a potential classification scheme based on tortoise coordinates

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.