期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 478, 期 1, 页码 1341-1376出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1029
关键词
methods: statistical; cosmology: theory; early Universe; large-scale structure of universe
资金
- European Union under REA [706896]
- Templeton Foundation
- Spanish MINECO of ICCUB (Unidad de Excelencia 'Maria de Maeztu') [MDM-2014-0369]
- Spanish Mineco of ICCUB (Unidad de Excelencia Maria de Maeztu) [MDM-2014-0369, AYA2014-58747-PAEI/FEDERUE]
- European UnionOs Horizon 2020 research and innovation programme ERC (BePreSySe) [725327]
We forecast constraints on primordial non-Gaussianity (PNG) and bias parameters from measurements of galaxy power spectrum and bispectrum in future radio continuum and optical surveys. In the galaxy bispectrum, we consider a comprehensive list of effects, including the bias expansion for non-Gaussian initial conditions up to second order, redshift space distortions, redshift uncertainties and theoretical errors. These effects are all combined in a single PNG forecast for the first time. Moreover, we improve the bispectrum modelling over previous forecasts, by accounting for trispectrum contributions. All effects have an impact on final predicted bounds, which varies with the type of survey. We find that the bispectrum can lead to improvements up to a factor similar to 5 over bounds based on the power spectrum alone, leading to significantly better constraints for local-type PNG, with respect to current limits from Planck. Future radio and photometric surveys could obtain a measurement error of sigma(f(NL)(loc)) approximate to 0.2. In the case of equilateral PNG, galaxy bispectrum can improve upon present bounds only if significant improvements in the redshift determinations of future, large volume, photometric or radio surveys could be achieved. For orthogonal non-Gaussianity, expected constraints are generally comparable to current ones.
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