Constraints on local primordial non-Gaussianity from large scale structure

Journal Article · Fri Aug 15 04:00:00 EDT 2008 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2008/08/031· OSTI ID:22156723

Slosar, Anze ^[1]; Hirata, Christopher ^[2]; Seljak, Uros ^[3]; Ho, Shirley ^[4]; Padmanabhan, Nikhil ^[5]

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1. Berkeley Center for Cosmological Physics, Physics Department, University of California, Berkeley, CA 94720 (United States)
2. Caltech M/C 130-33, Pasadena, CA 91125 (United States)
3. Institute for Theoretical Physics, University of Zurich, Zurich (Switzerland)
4. Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544 (United States)
5. Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720 (United States)

Recent work has shown that the local non-Gaussianity parameter f{sub NL} induces a scale dependent bias, whose amplitude is growing with scale. Here we first rederive this result within the context of the peak-background split formalism and show that it only depends on the assumption of universality of the mass function, assuming that the halo bias only depends on the mass. We then use the extended Press-Schechter formalism to argue that this assumption may be violated and that the scale dependent bias will depend on other properties, such as the merging history of halos. In particular, in the limit of recent mergers we find that the effect is suppressed. Next we use these predictions in conjunction with a compendium of large scale data to put a limit on the value of f{sub NL}. When combining all data assuming that the halo occupation depends only on the halo mass, we get a limit of -29 (-65)

• OSTI ID: 22156723
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2008; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
AMPLITUDES
ANISOTROPY
DATA
GALAXIES
GAUSSIAN PROCESSES
LIMITING VALUES
MASS
PROBES
QUASARS
RELICT RADIATION
SIGNALS
SIMULATION