Journal
PHYSICAL REVIEW D
Volume 85, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.85.041301
Keywords
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Funding
- STFC [ST/H002774/1]
- European Research Council
- Leverhulme trust
- South African SKA Research Chair
- Science and Technology Facilities Council [ST/I001204/1, ST/H002774/1] Funding Source: researchfish
- STFC [ST/I001204/1, ST/H002774/1] Funding Source: UKRI
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Local non-Gaussianity, parametrized by f(NL), introduces a scale-dependent bias that is strongest at large scales, precisely where general relativistic (GR) effects also become significant. With future data, it should be possible to constrain f(NL) = O(1) with high redshift surveys. GR corrections to the power spectrum and ambiguities in the gauge used to define bias introduce effects similar to f(NL) = O(1), so it is essential to disentangle these effects. For the first time in studies of primordial non-Gaussianity, we include the consistent GR calculation of galaxy power spectra, highlighting the importance of a proper definition of bias. We present observable power spectra with and without GR corrections, showing that an incorrect definition of bias can mimic non-Gaussianity. However, these effects can be distinguished by their different redshift and scale dependence, so as to extract the true primordial non-Gaussianity.
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