Constraining General Modifications of Gravity during Reionisation
  Intensity mapping enables us to test cosmology and fundamental physics during
the Epoch of Reionisation, with power spectra of line fluctuations probing a
large range of scales and redshifts. Cosmological volumes of 21cm line
fluctuations in general modified gravity scenarios are presented, where
additional parameters are the initial condition parameter $\alpha$ of matter
perturbations and the scale-dependent modified gravity parameter $Y$ that
measures deviations from General Relativity in the Poisson equation. For
upcoming surveys like the SKA we forecast, using the power spectra derived from
our simulations, the ability of intensity mapping to constrain modifications of
gravity during reionisation, as well as investigate correlations with
astrophysical parameters.
