[SEMINARI]: Dr. Umino: The Haag Expansion in Quantum Field Theory

[Arcadi Santamaria]

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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
                Thursday 04 of February of 1999 at 12:00 AM
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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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