Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of $f(R)$ gravity

Chandrachud B. V. Dash, Tapomoy Guha Sarkar, Anjan Kumar Sarkar

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 class of $…