Galaxy bias and primordial non-Gaussianity

Journal Article · Tue Dec 01 04:00:00 EST 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/12/043· OSTI ID:22525109

Assassi, Valentin; Baumann, Daniel ^[1]; Schmidt, Fabian ^[2]

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1. DAMTP, Cambridge University, Wilberforce Road, Cambridge CB3 0WA (United Kingdom)
2. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching (Germany)

We present a systematic study of galaxy biasing in the presence of primordial non-Gaussianity. For a large class of non-Gaussian initial conditions, we define a general bias expansion and prove that it is closed under renormalization, thereby showing that the basis of operators in the expansion is complete. We then study the effects of primordial non-Gaussianity on the statistics of galaxies. We show that the equivalence principle enforces a relation between the scale-dependent bias in the galaxy power spectrum and that in the dipolar part of the bispectrum. This provides a powerful consistency check to confirm the primordial origin of any observed scale-dependent bias. Finally, we also discuss the imprints of anisotropic non-Gaussianity as motivated by recent studies of higher-spin fields during inflation.

• OSTI ID: 22525109
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 12 Vol. 2015; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
COSMOLOGICAL INFLATION
ENERGY SPECTRA
EQUIVALENCE PRINCIPLE
FIELD OPERATORS
GALAXIES
INFLATIONARY UNIVERSE
RENORMALIZATION
SPIN
STATISTICS