General Modified Gravity With 21cm Intensity Mapping: Simulations and Forecast

Understand

Line intensity mapping opens up a new and exciting window for probing cosmology and fundamental physics during the Epoch of Reionisation, extending to redshifts previously untested by galaxy surveys.

• The power spectra of these line fluctuations are a promising tool to test gravity over a large range of scales and redshifts.
• We simulate cosmological volumes of 21cm fluctuations in general parametrisations of modified gravity, in order to calculate the corresponding power spectra, where additional parameters are the initial condition of matter perturbations $\alpha$ and the scale-dependent modified gravity parameter $Y$ (also known as $G_\mathrm{eff}$) that measures deviations from GR in the Poisson equation.
• We show the impact of these model-independent modifications of gravity, to either delay or expedite reionisation.