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Study of Cosmological Bias of Galaxies in Quasi Linear Regime


Affiliations
1 Research Scholar, CMR University, Bangalore-43, India
2 CMR University, Bangalore-43, India
 

Power spectrum of density variation of matter dominated era is calculated to prove that structure formation in the universe starts in the quasi-linear regime. Dimensionless power spectra for 1-halo and 2-halo for baryonic matter are calculated and compared with the 1-halo and 2-halo power spectra for dark matter. The higher values obtained for baryonic matter indicates over dense regions of baryonic matter leading to collapse to form large scale structures. The power spectrum values lead to cosmological bias values in unperturbed and perturbed universe. The obtained bias values being approaching unity indicate formation of large scale structure of galaxies starts in the quasi-linear regimes.

Keywords

Cosmological Bias, Large Scale Structure, Quasi Linear Regime, Power Spectrum, Dark Matter, Baryonic Matter.
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  • Nick K. On the spatial correlations of Abel clusters. Astrophysics. 1984;284:12.

  • Press WH, Schechter P. Formation of galaxies and clusters of galaxies by selfsimilar gravitational condensation. APJ. 1974;187:425.

  • James EG, Richard GJ. On the in-fall of matter into clusters of galaxies and some effects on their evolution. APJ. 1972;176:1-19.

  • Asantha C, Ravi S. Halo models of large scale structures. Astrophysic. 2002;508:1-129.

  • Bernardeau F. The effects of smoothing on the statistical properties of large scale cosmic fields. A and A.1994;291:697B.

  • arxiv:1402.7073v2 [astro-ph.co], 2014.

  • Fry JN, Gatzanaga E. Biasing and hierarchical structures in large-scale structures. APJ. 1993;413:47.

  • Manera M, Gaztanaga E. The local bias model the large scale halo distribution. RAS. 2011;415:383-98.

  • Julio FN, Carlos SF, Simon DMW. The structure of cold dark matter halos, APJ. 1996;462:563.

  • Peacock JA. Cambridge University Press. 2012.

  • Roman S, Joshua F. Loop corrections in non linear cosmological perturbation Theory. Astrophysical Journal. 1995;473:620.

  • Sheath RK, Torment G. MNRAS, 199:323.


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  • Study of Cosmological Bias of Galaxies in Quasi Linear Regime

Abstract Views: 197  |  PDF Views: 1

Authors

Sujata M.
Research Scholar, CMR University, Bangalore-43, India
Harish R.
CMR University, Bangalore-43, India

Abstract


Power spectrum of density variation of matter dominated era is calculated to prove that structure formation in the universe starts in the quasi-linear regime. Dimensionless power spectra for 1-halo and 2-halo for baryonic matter are calculated and compared with the 1-halo and 2-halo power spectra for dark matter. The higher values obtained for baryonic matter indicates over dense regions of baryonic matter leading to collapse to form large scale structures. The power spectrum values lead to cosmological bias values in unperturbed and perturbed universe. The obtained bias values being approaching unity indicate formation of large scale structure of galaxies starts in the quasi-linear regimes.

Keywords


Cosmological Bias, Large Scale Structure, Quasi Linear Regime, Power Spectrum, Dark Matter, Baryonic Matter.

References