Work

Vacuum fluctuations and the thermodynamics of chiral models

Year: 2010

Type: article

Abstract: We consider the thermodynamics of chiral models in the mean-field approximation and discuss the relevance of the (frequently omitted) fermion vacuum loop. Within the chiral quark-meson model and its Polyakov loop extended version, we show that the fermion vacuum fluctuations can change the order of the phase transition in the chiral limit and strongly influence physical observables. We compute the temperature-dependent effective potential and baryon-number susceptibilities in these models, with and without the vacuum term, and explore the cutoff and the pion mass dependence of the susceptibilities. Finally, in the renormalized model the divergent vacuum contribution is removed using dimensional regularization.

Source: Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields

DOI: 10.1103/physrevd.82.034029

Authors: V. Skokov, B. Friman, E. Nakano, K. Redlich, B.-J. Schaefer

Institutions: GSI Helmholtz Centre for Heavy Ion Research, University of Kochi, Kōchi University, University of Wrocław, European Organization for Nuclear Research, University of Graz

Language: English

Topic: Quantum Chromodynamics and Particle Interactions

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Alexander von Humboldt-Stiftung

OpenAlex ID: W2016294525

FWCI: 8.505

Cites: 49

Cited by: 180

Related to: 10