Strong-field magnetohydrodynamics for neutron stars

Vardhan, Shreya (author), Grozdanov, Sašo (author), Leutheusser, Samuel (author), Liu, Hong (author)

We present a formulation of magnetohydrodynamics which can be used to describe the evolution of strong magnetic fields in neutron star interiors. Our approach is based on viewing magnetohydrodynamics as a theory with a one-form global symmetry and developing an effective field theory for the hydrodynamic modes associated with this symmetry. In the regime where the local velocity and temperature variations can be neglected, we derive the most general constitutive relation consistent with symmetry constraints for the electric field in the presence of a strong magnetic field. This constitutive relation not only reproduces the phenomena of Ohmic decay, ambipolar diffusion, and Hall drift derived in a phenomenological model by Goldreich and Reisenegger, but also reveals terms in the evolution of the magnetic field which cannot easily be seen from such microscopic models. This formulation gives predictions for diffusion behaviors of small perturbations around a constant background magnetic field, and for the two-point correlation functions among various components of the electric and magnetic fields.

• Language: English
• Keywords: magnetohydrodynamics, magnetic field, neutron stars, effective field theory, diffusion
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: Str. L042050-1-L042050-12
• Numbering: Vol. 6, iss. 4
• PID: 20.500.12556/RUL-165227
• UDC: 537
• ISSN on article: 2643-1564
• DOI: 10.1103/PhysRevResearch.6.L042050
• COBISS.SI-ID: 216651779
• Publication date in RUL: 27.11.2024

Record is a part of a journal

• Title: Physical review research
• Publisher: American Phyisical Society
• ISSN: 2643-1564
• COBISS.SI-ID: 32822823

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: magnetohidrodinamika, magnetno polje, nevtronske zvezde, efektivna teorija polja, difuzija