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oai:docta.ucm.es:20.500.14352/598502023-08-27T07:16:30Zcom_20.500.14352_14col_20.500.14352_15

Fernández Álvarez-Estrada, Ramón Gómez Nicola, Ángel 2023-06-20T20:12:47Z 2023-06-20T20:12:47Z 1995-07 0370-2693 10.1016/0370-2693(95)00734-3 https://hdl.handle.net/20.500.14352/59850 http://dx.doi.org/10.1016/0370-2693(95)00734-3 http://www.sciencedirect.com/ 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. eng open access Effective chiral lagrangian from QCD at nonzero chemical potential journal article