Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of f(R) gravity
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,R 0. 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 Λ CDM cosmology at a precision, which is competitive with other probes of f(R) gravity.
- Publication:
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Journal of Astrophysics and Astronomy
- Pub Date:
- June 2023
- DOI:
- 10.1007/s12036-022-09885-w
- Bibcode:
- 2023JApA...44....5D
- Keywords:
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- Cosmology: f(R) gravity;
- galaxy weak lensing;
- 21-cm signal;
- Lyman-α forest