Non-Gaussianity and Excursion Set Theory: Halo Bias

Journal Article · Sat Sep 01 04:00:00 EDT 2012 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.86.063526· OSTI ID:1155802

Adshead, Peter ^[1]; Baxter, Eric J. ^[2]; Dodelson, Scott ^[3]; Lidz, Adam ^[4]

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1. Enrico Fermi Institute, Univ. of Chicago, IL (United States)
2. Univ. of Chicago, Chicago, IL (United States)
3. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
4. Univ. of Pennsylvania, Philadelphia, PA (United States)

We study the impact of primordial non-Gaussianity generated during inflation on the bias of halos using excursion set theory. We recapture the familiar result that the bias scales as $$k^{-2}$$ on large scales for local type non-Gaussianity but explicitly identify the approximations that go into this conclusion and the corrections to it. We solve the more complicated problem of non-spherical halos, for which the collapse threshold is scale dependent.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1155802
• Report Number(s): FERMILAB-PUB-12-377-A; arXiv eprint number arXiv:1206.3306
• Journal Information: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology Journal Issue: 6 Vol. 86; ISSN 1550-7998
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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79 ASTRONOMY AND ASTROPHYSICS