Constraints on Galaxy Bias, Matter Density, and Primordial Non-Gaussianity from thePSCzGalaxy Redshift Survey | Zendy

Hume A. Feldman | Zendy; Joshua A. Frieman | Zendy; J. N. Fry | Zendy; Román Scoccimarro | Zendy

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Constraints on Galaxy Bias, Matter Density, and Primordial Non-Gaussianity from thePSCzGalaxy Redshift Survey

Author(s) -

Hume A. Feldman,

Joshua A. Frieman,

J. N. Fry,

Román Scoccimarro

Publication year - 2001

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.86.1434

Subject(s) - bispectrum , galaxy , physics , non gaussianity , skewness , gaussian , astrophysics , statistics , statistical physics , scaling , spectral density , mathematics , quantum mechanics , geometry , cosmic microwave background , anisotropy

We compute the bispectrum for the IRAS PSCz catalog and find that the galaxy distribution displays the characteristic signature of gravity. Assuming Gaussian initial conditions, we obtain galaxy biasing parameters 1/b(1) = 1.20(+0.18)(-0.19) and b(2)/b(2)(1) = -0.42+/-0.19, with no sign of scale-dependent bias for k < or = 0.3h Mpc(-1). These results impose stringent constraints on non-Gaussian initial conditions. For dimensional scaling models with chi(2)(N) statistics, we find N > 49, which implies a constraint on primordial skewness B3 < 0.35.

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