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Signature of primordial non-Gaussianity of 3 type in the mass function and bias of dark matter haloes

Title
Signature of primordial non-Gaussianity of 3 type in the mass function and bias of dark matter haloes
Authors
Desjacques V.Seljak U.
Ewha Authors
Uros Seljak
Issue Date
2010
Journal Title
Physical Review D - Particles, Fields, Gravitation and Cosmology
ISSN
1550-7998JCR Link
Citation
vol. 81, no. 2
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
We explore the effect of a cubic correction gNL 3 on the mass function and bias of dark matter haloes extracted from a series of large N-body simulations and compare it to theoretical predictions. Such cubic terms can be motivated in scenarios like the curvaton model, in which a large cubic correction can be produced while simultaneously keeping the quadratic fNL 2 correction small. The deviation from the Gaussian halo mass function is in reasonable agreement with the theoretical predictions. The scale-dependent bias correction Δbκ(k,gNL) measured from the auto- and cross-power spectrum of haloes, is similar to the correction in fNL models, but the amplitude is lower than theoretical expectations. Using the compilation of LSS data in, we obtain for the first time a limit on gNL of -3.5×105<gNL<+8.2×105 (at 95% CL). This limit will improve with the future LSS data by 1-2 orders of magnitude, which should test many of the scenarios of this type. © 2010 The American Physical Society.
DOI
10.1103/PhysRevD.81.023006
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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