Relativistic effects and primordial non-Gaussianity in the galaxy bias

Journal Article · Fri Apr 01 04:00:00 EDT 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/04/011· OSTI ID:22277838

Bartolo, Nicola; Matarrese, Sabino ^[1]; Riotto, Antonio ^[2]

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1. Dipartimento di Fisica ''G. Galilei'', Università degli Studi di Padova, via Marzolo 8, I-35131 Padova (Italy)
2. INFN Sezione di Padova, via Marzolo 8, I-35131 Padova (Italy)

When dealing with observables, one needs to generalize the bias relation between the observed galaxy fluctuation field to the underlying matter distribution in a gauge-invariant way. We provide such relation at second-order in perturbation theory adopting the local Eulerian bias model and starting from the observationally motivated uniform-redshift gauge. Our computation includes the presence of primordial non-Gaussianity. We show that large scale-dependent relativistic effects in the Eulerian bias arise independently from the presence of some primordial non-Gaussianity. Furthermore, the Eulerian bias inherits from the primordial non-Gaussianity not only a scale-dependence, but also a modulation with the angle of observation when sources with different biases are correlated.

• OSTI ID: 22277838
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 04 Vol. 2011; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
CALCULATION METHODS
COSMOLOGY
FLUCTUATIONS
GALAXIES
GAUGE INVARIANCE
MODULATION
PERTURBATION THEORY
RED SHIFT
RELATIVISTIC RANGE