dc.contributor.author | Kopana, Mponeng | |
dc.contributor.author | Jolicoeur, Sheean | |
dc.contributor.author | Maartens, Roy | |
dc.date.accessioned | 2024-08-08T10:35:22Z | |
dc.date.available | 2024-08-08T10:35:22Z | |
dc.date.issued | 2024 | |
dc.identifier.citation | Kopana, M., Jolicoeur, S. and Maartens, R., 2024. Multi-tracing the primordial Universe with future surveys. The European Physical Journal C, 84(5), p.491. | en_US |
dc.identifier.issn | 14346044 | |
dc.identifier.uri | https://doi.org/10.1140/epjc/s10052-024-12839-x | |
dc.identifier.uri | http://hdl.handle.net/10566/9400 | |
dc.description.abstract | 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 Universe. In particular, local-type primordial non-Gaussianity induces scale-dependent bias in tracers of the matter distribution. This non-Gaussian imprint in the tracer power spectrum survives at late times on ultra-large scales where nonlinearity is negligible. In order to combat the problem of growing cosmic variance on these scales, we use a multi-tracer analysis that combines different tracers to maximise any primordial signal. Previous work has investigated the combination of a spectroscopic galaxy survey with a 21 cm intensity mapping survey in single-dish mode. We extend this work by considering instead the case where the 21 cm intensity mapping survey is optimised for interferometer mode. As examples, we use two multi-tracer pairs of surveys: one at high redshift (1≤z≤2) and one at very high redshift (2≤z≤5). The 21 cm surveys are idealised surveys based on HIRAX and PUMA. We implement foreground-avoidance filters and use detailed models of the interferometer thermal noise. The galaxy surveys are idealised surveys based on Euclid and MegaMapper | en_US |
dc.language.iso | en | en_US |
dc.publisher | Springer Nature | en_US |
dc.subject | cosmology | en_US |
dc.subject | galaxies | en_US |
dc.subject | gaussian distribution | en_US |
dc.subject | mapping | en_US |
dc.subject | thermal noise | en_US |
dc.subject | gaussian noise (electronic) | en_US |
dc.title | A wide-angle formulation of foreground filters for HI intensity mapping | en_US |
dc.type | Article | en_US |