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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/044/0005

    • Keywords

       

      Cosmology: $f(R)$ gravity; galaxy weak lensing; 21-cm signal; Lyman-$\alpha$ forest.

    • Abstract

       

      We propose the intensity mapping of the redshifted Hi 21-cm signal from the post-reionization epoch as a cosmological probe of $f(R)$ gravity. We consider the Hu–Sawicki family of $f(R)$ gravity models characterized by a single parameter $f_{,R0}$. The $f(R)$ modification to gravity affects the post-reionization 21-cm power spectrum through the change in the growth rate of density fluctuations. We find that a radio interferometric observation with a SKA1-mid-like radio telescope in both auto-correlation and cross-correlation with galaxy weak-lensing and Lyman-$\alpha$ forest may distinguish $f(R)$ models from $\Lambda$CDM cosmology at a precision, whichis competitive with other probes of $f(R)$ gravity.

    • Author Affiliations

       

      CHANDRACHUD B. V. DASH1 TAPOMOY GUHA SARKAR1 ANJAN KUMAR SARKAR2 3

      1. Department of Physics, Birla Institute of Technology and Science, Pilani, India.
      2. Raman Research Institute, Bangalore 560080, India.
      3. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411007, India.

    • Dates

       
      Published
      21 January 2023
      Manuscript received
      8 February 2022
      Accepted
      18 July 2022
      Final version published online
      21 January 2023

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

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