Disentangling non-gaussianity, bias, and general relativistic effects in the galaxy distribution

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dc.contributor.authorBruni, Marco
dc.contributor.authorCrittenden, Robert
dc.contributor.authorMaartens, Roy
dc.date.accessioned2023-06-02T10:17:34Z
dc.date.available2023-06-02T10:17:34Z
dc.date.issued2012
dc.description.abstractLocal 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.en_US
dc.identifier.citationBruni, 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.85.041301en_US
dc.identifier.issn1550-2368
dc.identifier.urihttps://doi.org/10.1103/PhysRevD.85.041301
dc.identifier.urihttp://hdl.handle.net/10566/8998
dc.language.isoenen_US
dc.publisherAmerican Physical Societyen_US
dc.subjectPhysicsen_US
dc.subjectAstronomyen_US
dc.subjectCosmologyen_US
dc.subjectGravitationen_US
dc.subjectGalaxiesen_US
dc.titleDisentangling non-gaussianity, bias, and general relativistic effects in the galaxy distributionen_US
dc.typeArticleen_US

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