Time Evolution of a Quantum System in a Medium and Mass Renormalization in the Projection Operator Method : Nuclear Physics

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概要

• 論文の詳細を見る

• The time evolution of a quantum system in field theory is studied. We use the Shibata-Hashitsume projection operator method, which is a nonperturbative expansion method known in quantum mechanics. We calculate the time evolution of expectation values of creation and annihilation operators in a super-renormalizable model with unstable particles (or resonances) and study the initial temperature dependence. We carry out the renormalization of the ultraviolet divergence that appears in the time-dependent frequency shift using a mass counterterm. A harmless divergence of the lnt-type remains at the initial time t = 0 after mass renormalization. It is suggested that the Shibata-Hashitsume projection operator method is applicable to quantum field theory.

• 理論物理学刊行会の論文
• 1999-02-25

著者

• MARUYAMA Masahiro

  Department of Geriatrics and Gerontology, Tohoku University Graduate School of Medicine

• TAKAGI Fujio

  Department of Physics, Tohoku University

• Takagi Fujio

  Department Of Basic Sciences Ishinomaki Senshu University

• Koide Tomoi

  Instituto De Fisica Universidade Federal Do Rio De Janeiro

• Koide T

  Kyoto Univ. Kyoto Jpn

• Koide Tomoi

  Department Of Physics Tohoku University

• Maruyama M

  Tohoku Univ. Sendai Jpn

• Maruyama Masahiro

  Department Of Geriatrics And Gerontology Tohoku University Graduate School Of Medicine

• Maruyama Masahiro

  Department Of Applied Mathematics Faculty Of Engineering Science Osaka University

• Maruyama Masahiro

  Faculty Of Engineering Science Osaka University

• KOIDE Tomoi

  Department of Physics, Tohoku University

• MARUYAMA Masahiro

  Department of Physics, Tohoku University

• TAKAGI Fujio

  Physics Department, Tohoku University

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