Disentangling non-gaussianity, bias, and general relativistic effects in the galaxy distribution
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Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract
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.
Description
Keywords
Physics, Astronomy, Cosmology, Gravitation, Galaxies
Citation
Bruni, M. et al. (2012). Disentangling non-gaussianity, bias, and general relativistic effects in the galaxy distribution. Physical Review D, 85 (4). https://doi.org/10.1103/PhysRevD.85.041301