Systematic error due to isotropic inhomogeneities

Hiroyuki Negishi, Ken-ichi Nakao, Chul-Moon Yoo, and Ryusuke Nishikawa
Phys. Rev. D 92, 103003 – Published 23 November 2015

Abstract

Usually the effects of isotropic inhomogeneities are not seriously taken into account in the determination of the cosmological parameters because of the Copernican principle whose statement is that we do not live in the privileged domain in the Universe. But the Copernican principle has not been observationally confirmed yet in sufficient accuracy, and there is the possibility that there are non-negligible large-scale isotropic inhomogeneities in our Universe. In this paper, we study the effects of the isotropic inhomogeneities on the determination of the cosmological parameters and show the probability that non-Copernican isotropic inhomogeneities mislead us into believing, for example, the phantom energy of the equation of state, p=wρ with w<1, even in the case that w=1 is the true value.

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  • Received 22 May 2015

DOI:https://doi.org/10.1103/PhysRevD.92.103003

© 2015 American Physical Society

Authors & Affiliations

Hiroyuki Negishi1,*, Ken-ichi Nakao1,†, Chul-Moon Yoo2,‡, and Ryusuke Nishikawa1,§

  • 1Department of Mathematics and Physics, Graduate School of Science, Osaka City University, Sumiyoshi-ku, Osaka City 558-8585, Japan
  • 2Division of Particle and Astrophysical Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan

  • *negishi@sci.osaka-cu.ac.jp
  • knakao@sci.osaka-cu.ac.jp
  • yoo@gravity.phys.nagoya-u.ac.jp
  • §ryusuke@sci.osaka-cu.ac.jp

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Issue

Vol. 92, Iss. 10 — 15 November 2015

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