Low-energy behavior of a quantized scalar field in the linearly expanding universe |
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| Authors: | Takahiro Azuma Akira Tomimatsu |
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| Affiliation: | (1) Research Institute for Theoretical Physics, Hiroshima University, Takehara, 725 Hiroshima, Japan;(2) Present address: Institute of Physics, College of General Education, University of Tokyo, 153 Tokyo, Japan |
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| Abstract: | We study positive frequency mode solutions of a massive scalar field at an initial stage in the spatially flat, linearly expanding Robertson-Walker universe. The essential point is that the initial time is taken to be small enough, but nonzero (e.g., the Planck time), and the mode is determined by a kind of WKB condition. We calculate the created particle spectrum, and show that its low-energy behavior is considerably different from the previous results. |
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