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[文献書誌] 小合徳幸, 松宮慎, 佐々木節, 横山順一: "Reconstructing the primordial spectrum from WMAP data by the cosmic inversion method"Astrophysical Journal. (印刷中). (2004)
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[文献書誌] 山口昌英, 横山順一: "Chaotic hybrid new inflation in supergravity with a running spectral index"Physical Review. D68. 123590(9) (2003)
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[文献書誌] 瀬戸直樹, 横山順一: "Probing the equation of state of the early universe with a space laser interferometer"Journal of the Physical Society of Japan. 72. 3082-3086 (2003)
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[文献書誌] 川崎雅裕, 山口昌英, 横山順一: "Inflation with a running spectral index in supergravity"Physical Review. D68. 023508(7) (2003)
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[文献書誌] 横山順一: "Probing the star formation epoch with Wilkinson Microwave Anisotropy Probe(WMAP) data and high-redshift QSOs"Publications of Astronomical Society of Japan Letter. 55. L41-L44 (2003)
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[文献書誌] 馬場一晴, 横山順一: "Large-Scale magnetic fields from inflation in dilaton electromagnetism"Physical Review. D69. 043507(15) (2004)
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[文献書誌] 横山順一他: "大学院宇宙物理"講談社サイエンティフィク(印刷準備中). (2004)