2026-06-29T07:51:19Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/598502023-08-27T07:16:30Zcom_20.500.14352_14col_20.500.14352_15
Effective chiral lagrangian from QCD at nonzero chemical potential
Fernández Álvarez-Estrada, Ramón
Gómez Nicola, Ángel
53
Finite-temperature
Resonance physics
Current-algebra
Gauge-theories
Quark
Anomalies
Density
Pion
Física (Física)
22 Física
© 1995 Elsevier Science B.V. We thank Prof. A. Dobado for useful information. The financial supports of CICYT (Proyecto AEN93-0776), Spain, and Human Capital and Mobility Programme, European Commission (Contract ERBCHRXCT940423), Brussels, are acknowledged.
We start from the euclidean QCD action for gluons and massless quarks with N_c colours at finite baryon chemical potential ps and zero temperature. For μ_B of the order of external momenta o(p) we derive an euclidean effective real chiral lagrangian at finite pe, up to and including o(p^4), in terms of Goldstone Bosons (GB), in the large N_c limit, including gluon contributions. Our effective action generalizes non-trivially the one obtained for μ_B = 0 by previous authors, and it includes new μ_B -dependent terms. In particular, a topological term μ_B N_B is found, N_B being the baryon number in terms of GB fields with the correct normalization factor. Physical implications of the remaining μ_B -dependent terms are discussed briefly.
Comisión Interministerial de Ciencia y Tecnología (CICYT), España
Human Capital and Mobility Programme, European Commission
Unión Europea (UE)
Depto. de Física Teórica
Fac. de Ciencias Físicas
TRUE
pub
2023-06-20T20:12:47Z
2023-06-20T20:12:47Z
1995-07
journal article
https://hdl.handle.net/20.500.14352/59850
0370-2693
10.1016/0370-2693(95)00734-3
eng
AEN93-0776
ERBCHRXCT940423
open access
application/pdf
Elsevier