Hunting down horizon-scale effects with multi-wavelength surveys
| dc.contributor.author | Fonseca, Jose | |
| dc.contributor.author | Camera, Stefano | |
| dc.contributor.author | Santos, Mario G. | |
| dc.contributor.author | Maartens, Roy | |
| dc.date.accessioned | 2015-10-24T14:14:49Z | |
| dc.date.available | 2015-10-24T14:14:49Z | |
| dc.date.issued | 2015 | |
| dc.description.abstract | Next-generation cosmological surveys will probe ever larger volumes of the universe, including the largest scales, near and beyond the horizon. On these scales, the galaxy power spectrum carries signatures of local primordial non-Gaussianity (PNG) and horizon-scale general relativistic (GR) effects. However, cosmic variance limits the detection of horizon-scale effects. Combining different surveys via the multi-tracer method allows us to reduce the effect of cosmic variance. This method benefits from large bias differences between two tracers of the underlying dark matter distribution, which suggests a multi-wavelength combination of large volume surveys that are planned on a similar timescale. We show that the combination of two contemporaneous surveys, a large neutral hydrogen intensity mapping survey in SKA Phase 1 and a Euclid-like photometric survey, will provide unprecedented constraints on PNG as well as detection of the GR effects. We forecast that the error on local PNG will break through the cosmic variance limit on cosmic microwave background surveys, depending on assumed priors, bias, and sky coverage. GR effects are more robust to changes in the assumed fiducial model, and we forecast that they can be detected with a signal-to-noise of about 14. | en_US |
| dc.identifier.citation | Fonseca, J., et al., (2015). Hunting down horizon-scale effects with multi-wavelength surveys. Astrophysical Journal Letters, vol. 812(2) | en_US |
| dc.identifier.issn | 2041-8205 | |
| dc.identifier.uri | http://hdl.handle.net/10566/1901 | |
| dc.language.iso | en | en_US |
| dc.privacy.showsubmitter | false | |
| dc.publisher | American Astronomical Society | en_US |
| dc.rights | This is the author version of the published article available at dx.doi.org/10.1088/2041-8205/812/2/L22. | |
| dc.source.uri | http://dx.doi.org/10.1088/2041-8205/812/2/L22 | |
| dc.status.ispeerreviewed | true | |
| dc.subject | Cosmological surveys | en_US |
| dc.subject | Primordial non-Gaussianity (PNG) | en_US |
| dc.subject | Galaxy power spectrum | en_US |
| dc.subject | Cosmology | en_US |
| dc.subject | Galaxies | en_US |
| dc.subject | Horizon-scale effects | en_US |
| dc.subject | Cosmic variance | en_US |
| dc.title | Hunting down horizon-scale effects with multi-wavelength surveys | en_US |
| dc.type | Article | en_US |