1988 Fiscal Year Final Research Report Summary
Quantum Electrodynamics in Strong External Fields
| Project/Area Number |
62540211
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
核・宇宙線・素粒子
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
MINAKATA Hisakazu Department of Physics, Tokyo Metropolitan University, 理学部, 助手 (00112475)
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| Co-Investigator(Kenkyū-buntansha) |
白石 郁美 北里大学, 教養部, 助手
S.HIRATA Yumi Institute of Physics, College of Liberal Arts and Science, Kitasato University
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| Project Period (FY) |
1987 – 1988
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| Keywords | QED / Bosonization / Supercritical phase / 電子雲の振動モード |
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| Research Abstract |
Based on a new formulation of QED the physics around a hypothetical highly charged nucleus is investigated. Our formalism describes QED in terms of Bose variables and the electron appears as a topological soliton. At Z <greater than or equal> Z_c<similar or equal> 170 the vacuum undergoes the phase transition from the normal to the supercritical ground states. The structure of this transition is elucidated as a first-order phase transition. That is, the process is described as grow of the bubble of the true ground state in the false vacuum. The latent heat is carried away by the bubble wall which is nothing but the spontaneously produced positrons. The ground state of the supercritical vacuum is shown to have a soliton-like structure. The excitations on it is analyzed within the small-fluctuation approximation. New charge-neutral metastable excitations are found. Their energies weakly depend onand takes stable values - 1.6 MeV around the terminate point beyond which the states cease to exist. Near the terminate point the widths of the states are 1 - 10 keV, which are sufficiently narrow to explain GSI e^+e^- peak structure.
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