On the Definition of a Positive Frequency Part for a Quantized Scalar Field in Several Robertson-Walker Universes
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概要
- 論文の詳細を見る
The concept of a positive frequency part in the beginning of the cosmic expansion for a quantized field is important in discussing the pair-creation of the corresponding particles in an early universe. Therefore, an attempt is made to examine how the positive frequency part is defined for a canonically quantized massive or massless scalar field coupled conformally or minimally to one of several isotropic universes with flat 3-space. It is shown that there exists a variety of possibilities to the problem, so that the validity of our modified thermal law for the production of massive scalar particles coupled conformally to the Chitre-Hartle universe is not universal. A counterplan to remove the difficulty in defining the required positive frequency part for a massive scalar fleld in the radiation dominated Friedmann universe (whose physical reality in an early stage of the cosmic evolution is now established) is also touched upon.
- 理論物理学刊行会の論文
- 1980-10-25
著者
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Nariai Hidekazu
Research Institute For Theoretical Physics Hiroshima Unicersity
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Azuma Takahiro
Research Division Hokuriku Seiyaku Co. Ltd.
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Azuma Takahiro
Research Institute For Theoretical Physics Hiroshima University
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Nariai Hidekazu
Research Institute For Theorerical Physics Hiroshima University
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AZUMA Takahiro
Department of Mathematics, King's College London
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