Chiral pions in a magnetic background

  • We investigate the modification of the pion self-energy at finite temperature due to its interaction with a low-density, isospin-symmetric nuclear medium embedded in a constant magnetic background. To one loop, for fixed temperature and density, we find that the pion effective mass increases with the magnetic field. For the π−, interestingly, this happens solely due to the trivial Landau quantization shift ∼|eB|, since the real part of the self-energy is negative in this case. In a scenario in which other charged particle species are present and undergo an analogous trivial shift, the relevant behavior of the effective mass might be determined essentially by the real part of the self-energy. In this case, we find that the pion mass decreases by ∼10% for a magnetic field |eB|∼mπ2, which favors pion condensation at high density and low temperatures.

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Author:Giuseppe ColucciORCiDGND, Eduardo Souza FragaORCiDGND, Armen SedrakianORCiDGND
Parent Title (English):Physics Letters B
Place of publication:Amsterdam
Document Type:Article
Date of Publication (online):2013/11/22
Date of first Publication:2013/11/22
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2023/10/06
Tag:Chiral perturbation theory; Dense nuclear matter; In-medium pion mass; Magnetic field
Page Number:6
First Page:19
Last Page:24
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 3.0