Dressing up the kink

Yoav Bergner, Luís M A Bettencourt

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish (US)
Article number045002
JournalPhysical Review D
Volume69
Issue number4
DOIs
StatePublished - 2004

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Hartree approximation
profiles
scalars
temperature
energy
defects
interactions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Dressing up the kink. / Bergner, Yoav; Bettencourt, Luís M A.

In: Physical Review D, Vol. 69, No. 4, 045002, 2004.

Research output: Contribution to journalArticle

Bergner, Yoav ; Bettencourt, Luís M A. / Dressing up the kink. In: Physical Review D. 2004 ; Vol. 69, No. 4.
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