Representation of spectral functions and thermodynamics

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Abstract

In this paper, we study the question of effective field assignment to measured or nonperturbatively calculated spectral functions. The straightforward procedure is to approximate it by a sum of independent Breit-Wigner resonances and assign an independent field to each of these resonances. The problem with this idea is that it introduces new conserved quantities in the free model (the new particle numbers); therefore it changes the symmetry of the system. We avoid this inconsistency by representing each quantum channel with a single effective field, no matter how complicated the spectral function is. Thermodynamical characterization of the system is computed with this representation method, and its relation to the independent resonance approximation is discussed.

Original languageEnglish
Article number085007
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume86
Issue number8
DOIs
Publication statusPublished - Oct 1 2012

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thermodynamics
symmetry
approximation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Representation of spectral functions and thermodynamics. / Jakovác, A.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 86, No. 8, 085007, 01.10.2012.

Research output: Contribution to journalArticle

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