[SEMINARI]: Dr. Umino: The Haag Expansion in Quantum Field Theory
Arcadi Santamaria
Arcadi.Santamaria en uv.es
Lun Mar 1 09:38:08 CET 1999
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S E M I N A R I
[Image] Departament de Física Teòrica [Image]
Universitat de València
46100 Burjassot (València) Spain
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The Haag Expansion in Quantum Field Theory
Yasuo Umino
(IFIC (Valencia))
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Aula de Seminaris de Física Teòrica
Tuesday 02 of March of 1999 at 04:00 PM
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Resum
We present a novel method to study quantum field theories at finite
temperature and density. The method is based on the Haag expansion where the
Heisenberg fields of a theory are expanded in a series of normal-ordered
asymptotic fields, including the asymptotic fields for bound states.
Temperature and chemical potential are introduced simultaneously through the
generalized thermal Bogoliubov transformation. We apply this method to the
Nambu-Jona-Lasinio model, both in the mean-field approximation and beyond,
and show how this example can be extended to study Quantum Chromodynamics at
finite temperature and non-zero chemical potential.
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