Quasi Non-linear Evolution of Stochastic Bias

Details Quasi Non-linear Evolution of Stochastic Bias Quasi Non-linear Evolution of Stochastic Bias

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.554t&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

It is generally believed that the spatial distribution of the galaxies does not trace that of the total mass. The understanding of the bias effect is necessary to determine the cosmological parameter and the primordial spectrum from the enormous data obtained from future sky survey. Moreover, it is recently discussed that the galaxy denstiy cannot be perfectly correlated with the underlying total mass. Therefore, we should investigate the stochastic nature of the galaxy biasing. In this article, we specifically pay an attention on the quasi non-linear evolution of the sohcastic bias under influence of the gravity. Developing the stochastic formulation of galaxy biasing and using the tree-level perturbation, we show that the time evolution of the skewness, the bi-spectrum and the conditional mean for the galaxy distribution significantly differs from the one obtained from the deterministic bias description.

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