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Title: Elucidating dark energy with future 21 cm observations at the epoch of reionization

Abstract

We investigate how precisely we can determine the nature of dark energy such as the equation of state (EoS) and its time dependence by using future observations of 21 cm fluctuations at the epoch of reionization (06.8∼< z ∼<1) such as Square Kilometre Array (SKA) and Omniscope in combination with those from cosmic microwave background, baryon acoustic oscillation, type Ia supernovae and direct measurement of the Hubble constant. We consider several parametrizations for the EoS and find that future 21 cm observations will be powerful in constraining models of dark energy, especially when its EoS varies at high redshifts.

Authors:
 [1];  [2];  [3];  [4]
  1. The Graduate University for Advanced Studies (SOKENDAI), 1-1 Oho, Tsukuba 305-0801 (Japan)
  2. Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582 (Japan)
  3. Center for Theoretical Physics of the Universe, Institute for Basic Science (IBS), 193, Munjiro, Yuseoung-gu, Daejeon 34051 (Korea, Republic of)
  4. Department of Physics, Saga University, 1 Honjo, Saga 840-8502 (Japan)
Publication Date:
OSTI Identifier:
22680030
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2017; Journal Issue: 02; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; EQUATIONS OF STATE; FLUCTUATIONS; NONLUMINOUS MATTER; OSCILLATIONS; RED SHIFT; RELICT RADIATION; SUPERNOVAE; TIME DEPENDENCE

Citation Formats

Kohri, Kazunori, Oyama, Yoshihiko, Sekiguchi, Toyokazu, and Takahashi, Tomo, E-mail: kohri@post.kek.jp, E-mail: oyamayo@icrr.u-tokyo.ac.jp, E-mail: sekiguti@ibs.re.kr, E-mail: tomot@cc.saga-u.ac.jp. Elucidating dark energy with future 21 cm observations at the epoch of reionization. United States: N. p., 2017. Web. doi:10.1088/1475-7516/2017/02/024.
Kohri, Kazunori, Oyama, Yoshihiko, Sekiguchi, Toyokazu, & Takahashi, Tomo, E-mail: kohri@post.kek.jp, E-mail: oyamayo@icrr.u-tokyo.ac.jp, E-mail: sekiguti@ibs.re.kr, E-mail: tomot@cc.saga-u.ac.jp. Elucidating dark energy with future 21 cm observations at the epoch of reionization. United States. doi:10.1088/1475-7516/2017/02/024.
Kohri, Kazunori, Oyama, Yoshihiko, Sekiguchi, Toyokazu, and Takahashi, Tomo, E-mail: kohri@post.kek.jp, E-mail: oyamayo@icrr.u-tokyo.ac.jp, E-mail: sekiguti@ibs.re.kr, E-mail: tomot@cc.saga-u.ac.jp. Wed . "Elucidating dark energy with future 21 cm observations at the epoch of reionization". United States. doi:10.1088/1475-7516/2017/02/024.
@article{osti_22680030,
title = {Elucidating dark energy with future 21 cm observations at the epoch of reionization},
author = {Kohri, Kazunori and Oyama, Yoshihiko and Sekiguchi, Toyokazu and Takahashi, Tomo, E-mail: kohri@post.kek.jp, E-mail: oyamayo@icrr.u-tokyo.ac.jp, E-mail: sekiguti@ibs.re.kr, E-mail: tomot@cc.saga-u.ac.jp},
abstractNote = {We investigate how precisely we can determine the nature of dark energy such as the equation of state (EoS) and its time dependence by using future observations of 21 cm fluctuations at the epoch of reionization (06.8∼< z ∼<1) such as Square Kilometre Array (SKA) and Omniscope in combination with those from cosmic microwave background, baryon acoustic oscillation, type Ia supernovae and direct measurement of the Hubble constant. We consider several parametrizations for the EoS and find that future 21 cm observations will be powerful in constraining models of dark energy, especially when its EoS varies at high redshifts.},
doi = {10.1088/1475-7516/2017/02/024},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 02,
volume = 2017,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}