Title:	Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of f(R) gravity
Authors:	Dash, Chandrachud B. V. Sarkar, Tapomoy Guha Sarkar, Anjan Kumar
Issue Date:	20-Jan-2023
Publisher:	Indian Academy of Sciences
Citation:	Journal of Astrophysics and Astronomy, 2023, Vol.44, ArticleNo.5
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-α forest may distinguish f(R) models from ΛCDM cosmology at a precision, which is competitive with other probes of f(R) gravity.
Description:	Open Access from Indian Academy of Sciences
URI:	http://hdl.handle.net/2289/8045
ISSN:	0250-6335 0973-7758 (Online)
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2023JApA...44....5D/abstract https://arxiv.org/abs/2012.07373 https://doi.org/10.1007/s12036-022-09885-w https://inspirehep.net/literature/1836418
Copyright:	2023 Indian Academy of Sciences
Appears in Collections:	Research Papers (A&A)

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