TY - JOUR
T1 - Dressing up the kink
AU - Bergner, Yoav
AU - Bettencourt, Luís M.A.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2004/2/6
Y1 - 2004/2/6
N2 - Many quantum field theoretical models possess nontrivial solutions which are stable for topological reasons. We construct a self-consistent example for a self-interacting scalar field—the quantum (or dressed) kink—using a two particle irreducible effective action in the Hartree approximation. This new solution includes quantum fluctuations determined self-consistently and nonperturbatively at the 1-loop resummed level and allowed to back react on the classical mean-field profile. This dressed kink is static under the familiar Hartree equations for the time evolution of quantum fields. Because the quantum fluctuation spectrum is lower lying in the presence of the defect, the quantum kink has a lower rest energy than its classical counterpart. However its energy is higher than well-known strict 1-loop results, where back reaction and fluctuation self-interactions are omitted. We also show that the quantum kink exists at finite temperature and that its profile broadens as temperature is increased until it eventually disappears.
AB - Many quantum field theoretical models possess nontrivial solutions which are stable for topological reasons. We construct a self-consistent example for a self-interacting scalar field—the quantum (or dressed) kink—using a two particle irreducible effective action in the Hartree approximation. This new solution includes quantum fluctuations determined self-consistently and nonperturbatively at the 1-loop resummed level and allowed to back react on the classical mean-field profile. This dressed kink is static under the familiar Hartree equations for the time evolution of quantum fields. Because the quantum fluctuation spectrum is lower lying in the presence of the defect, the quantum kink has a lower rest energy than its classical counterpart. However its energy is higher than well-known strict 1-loop results, where back reaction and fluctuation self-interactions are omitted. We also show that the quantum kink exists at finite temperature and that its profile broadens as temperature is increased until it eventually disappears.
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U2 - 10.1103/PhysRevD.69.045002
DO - 10.1103/PhysRevD.69.045002
M3 - Article
AN - SCOPUS:1642361404
VL - 69
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
SN - 1550-7998
IS - 4
ER -