Synopsis: Screening and the Coulomb interaction

How screening affects the Coulomb interaction has long been considered a solved problem, but an analysis indicates there is an error in the widely used analytical approach.
Synopsis figure
Illustration: Alan Stonebraker

In the 1960s and 1970s, several papers (see for example Refs. [1–4]) reported the solution to the problem of Coulomb scattering. Starting with a screened Coulomb potential, one could obtain the corresponding screened Coulomb “t matrix.” In the limit of an infinite screening radius, it was stated that the on-shell t matrix, which accounts for observable effects, approaches the physical one except for an infinitely oscillating phase factor that is known analytically. Removing this factor—a process called renormalization—it is possible to obtain the physical Coulomb result from the screened Coulomb potential approximation.

This standard renormalization method for determining the physical t matrix from a screened on-shell t matrix has enjoyed widespread use. However, according to a paper appearing in Physical Review C by Walter Glöckle and Jacek Golak at the Ruhr-Universität Bochum in Germany and Roman Skibiński and Henryk Witała at Jagiellonian University in Kraków, Poland, the accepted renormalization factor is incomplete. The standard analytic renormalization factor, which is generally believed to be valid for any type of screening and is used widely in the literature, is seemingly missing a term that is singular at forward and backward scattering angles.

Glöckle et al. present numerical results to illustrate the error in the standard renormalization approach. The implications of their findings for prior numerical calculations could be significant. – Ben Gibson

[1] V. G. Gorshkov, Sov. Phys. JETP 13, 1037 (2962); 20, 234 (1965).

[2] W. F. Ford, Phys. Rev. 133, B1616 (1964); J. Math. Phys. 7, 626 (9166).

[3] J. R. Taylor, Nuovo Cimento B 23, 313 (1974).

[4] M. D. Semon and J. R. Taylor, Nuovo Cimento A 26, 48 (1975).


Announcements

More Announcements »

Subject Areas

Statistical Physics

Next Synopsis

Nonlinear Dynamics

Solitons in an ionic crystal

Read More »

Related Articles

Synopsis: In, Yet Out of Equilibrium
Statistical Physics

Synopsis: In, Yet Out of Equilibrium

An analysis of a popular model for active matter, like bacteria and buffalo herds, defines the conditions under which such systems can be described with the tools of equilibrium statistics. Read More »

Synopsis: The Little Engine That Could
Statistical Physics

Synopsis: The Little Engine That Could

Researchers propose a stochastic heat engine that runs without an external control system. Read More »

Focus: How to Compare Books or Genomes
Complex Systems

Focus: How to Compare Books or Genomes

A mathematical technique for comparing large symbol sets suggests that less frequently used words are mainly responsible for the evolution of the English language over the past two centuries. Read More »

More Articles