RT Journal Article
T1 Nonequilibrium chiral perturbation theory and pion decay functions
A1 Gómez Nicola, Ángel
A1 Galán González, V.
AB We extend chiral perturbation theory to study a meson gas out of thermal equilibrium. Assuming that the system is initially in equilibrium at T-i < T-c and working within the Schwinger-Keldysh contour technique, we define consistently the time-dependent temporal and spatial pion decay functions, the counterparts of the pion decay constants, and calculate them to next to leading order. The link with curved space-time QFT allows to establish nonequilibrium renormalisation. The short-time behaviour and the applicability of our model to a heavy-ion collision plasma are also discussed in this work.
PB Elsevier science
SN 0370-2693
YR 1999
FD 1999-03-11
LK https://hdl.handle.net/20.500.14352/59584
UL https://hdl.handle.net/20.500.14352/59584
LA eng
NO © 1999 Elsevier Science B.V.We are grateful to T. Evans and R. Rivers for countless and fruitful discussions, as well as to R.F. Alvarez-Estrada, A. Dobado and A.L. Maroto for providing useful references and comments. A.G.N wishes to thank the Imperial College group for their kind hospitality during his stay there and has received financial support through a postdoctoral fellowship of the Spanish Ministry of Education and CICYT, Spain, project AEN97-1693.
NO Spanish Ministry of Education
NO CICYT, Spain
DS Docta Complutense
RD 7 abr 2025