TY  - JOUR
A1  - Colucci, Giuseppe
A1  - Fraga, Eduardo Souza
A1  - Sedrakian, Armen
T1  - Chiral pions in a magnetic background
T2  - Physics Letters B
N2  - 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.
KW  - Magnetic field
KW  - Dense nuclear matter
KW  - In-medium pion mass
KW  - Chiral perturbation theory
Y1  - 2013
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/76979
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-769791
SN  - 0370-2693
VL  - 728.2014
SP  - 19
EP  - 24
PB  - Elsevier
CY  - Amsterdam
ER  -