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Redshifted HI 21-cm Signal from the Post-Reionization Epoch: Cross-Correlations with Other Cosmological Probes

  • T. Guha SarkarEmail author
  • K. K. Datta
  • A. K. Pal
  • T. Roy Choudhury
  • S. Bharadwaj
Review
First Online:

Abstract

Tomographic intensity mapping of the HI using the redshifted 21-cm observations opens up a new window towards our understanding of cosmological background evolution and structure formation. This is a key science goal of several upcoming radio telescopes including the Square Kilometer Array (SKA). In this article, we focus on the post-reionization signal and investigate the cross correlating of the 21-cm signal with other tracers of the large scale structure. We consider the cross-correlation of the post-reionization 21-cm signal with the Lyman- α forest, Lyman-break galaxies and late time anisotropies in the CMBR maps like weak lensing and the integrated Sachs Wolfe effect. We study the feasibility of detecting the signal and explore the possibility of obtaining constraints on cosmological models using it.

Keywords

Cosmology: theory large-scale structure of Universe cosmology: diffuse radiation cosmology: dark energy 
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Notes

Acknowledgements

The second author (KKD) would like to thank DST for support through the project SR/FTP/PS-119/2012. The first author (TGS) would like to thank the project SR/FTP/PS-172/2012 for financial support.

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Copyright information

© Indian Academy of Sciences 2016

Authors and Affiliations

  • T. Guha Sarkar
    • 1
    Email author
  • K. K. Datta
    • 2
  • A. K. Pal
    • 1
  • T. Roy Choudhury
    • 3
  • S. Bharadwaj
    • 4
  1. 1.Department of PhysicsBirla Institute of Technology and SciencePilaniIndia
  2. 2.Department of PhysicsPresidency UniversityKolkataIndia
  3. 3.National Centre for Radio AstrophysicsPuneIndia
  4. 4.Department of PhysicsIndian Institute of TechnologyKharagpurIndia

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