5 papers
Multi-tracing the primordial Universe with future surveys
Mponeng Kopana, Sheean Jolicoeur, Roy Maartens
The fluctuations generated by Inflation are nearly Gaussian in the simplest models, but may be non-Gaussian in more complex models, potentially leading to signatures in the late Un…
Apparent parity violation in the observed galaxy trispectrum
Pritha Paul, Chris Clarkson, Roy Maartens
Recent measurements of the 4-point correlation function in large-scale galaxy surveys have found apparent evidence of parity violation in the distribution of galaxies. This cannot…
Covariant cosmography: the observer-dependence of the Hubble parameter
Roy Maartens, Jessica Santiago, Chris Clarkson +2
The disagreement between low- and high-redshift measurements of the Hubble parameter is emerging as a serious challenge to the standard model of cosmology. We develop a covariant c…
The HI intensity mapping power spectrum: insights from recent measurements
Hamsa Padmanabhan, Roy Maartens, Obinna Umeh +1
The first direct measurements of the HI intensity mapping power spectrum were recently made using the MeerKAT telescope. These measurements are on nonlinear scales, at redshifts 0.…
A wide-angle formulation of foreground filters for HI intensity mapping
Rahul Kothari, Roy Maartens
Neutral hydrogen intensity mapping can in principle deliver rapid and large-volume cosmological surveys with exquisitely accurate redshifts that are determined directly from imagin…