Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

1-2017

Journal or Book Title

Nuclear Physics A

Volume

957

First Page

406

Last Page

415

DOI

10.1016/j.nuclphysa.2016.10.003

Abstract

Electromagnetic fields are generated in high energy nuclear collisions by spectator valence protons. These fields are traditionally computed by integrating the Maxwell equations with point sources. One might expect that such an approach is valid at distances much larger than the proton size and thus such a classical approach should work well for almost the entire interaction region in the case of heavy nuclei. We argue that, in fact, the contrary is true: due to the quantum diffusion of the proton wave function, the classical approximation breaks down at distances of the order of the system size. We compute the electromagnetic field created by a charged particle described initially as a Gaussian wave packet of width 1 fm and evolving in vacuum according to the Klein–Gordon equation. We completely neglect the medium effects. We show that the dynamics, magnitude and even sign of the electromagnetic field created by classical and quantum sources are different.

Comments

This is a manuscript of an article published as Holliday, Robert, Ryan McCarty, Balthazar Peroutka, and Kirill Tuchin. "Classical electromagnetic fields from quantum sources in heavy-ion collisions." Nuclear Physics A 957 (2017): 406-415. DOI: 10.1016/j.nuclphysa.2016.10.003. Posted with permission.

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Published Version

Included in

Nuclear Commons

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