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  • Featured in Physics
  • Letter
  • Open Access

Incomplete electromagnetic response of hot QCD matter

Zeyan Wang1, Jiaxing Zhao1, Carsten Greiner2, Zhe Xu1, and Pengfei Zhuang1

  • 1Department of Physics, Tsinghua University, Beijing 100084, China
  • 2Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany

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Phys. Rev. C 105, L041901 – Published 27 April, 2022

DOI: https://doi.org/10.1103/PhysRevC.105.L041901

Abstract

The electromagnetic response of hot QCD matter to decaying external magnetic fields is investigated. We examine the validity of Ohm's law and find that the induced electric current increases from zero and relaxes towards the value from Ohm's law. The relaxation time is larger than the lifetime of the external magnetic field for the QCD matter in relativistic heavy-ion collisions. The lower-than-expected electric current significantly suppresses the induced magnetic field and makes the electromagnetic response incomplete. We demonstrate the incomplete electromagnetic response of hot QCD matter by calculations employing the parton transport model combined with the solution of Maxwell's equations. Our results show a strong suppression by two orders of magnitude in the magnetic field relative to calculations assuming the validity of Ohm's law. This may undermine experimental efforts to measure magnetic-field-related effects in heavy-ion collisions.

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synopsis

Ohm’s Law Violated in Heavy-Ion Collisions

Published 27 April, 2022

The magnetic field generated in a high-energy collision of heavy ions might be weaker than previously thought, hindering the experimental search for field-related effects.

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Outline

Information

Phys. Rev. C 105, L041901– Published 27 April, 2022
  • Received 5 November 2021
  • Revised 21 February 2022
  • Accepted 18 March 2022
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