Cosmology with high (z>1) redshift galaxy surveys


Cosmology with high (z>1) redshift galaxy surveys

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dc.contributor.advisor Komatsu, Eiichiro
dc.creator Jeong, Donghui 2010-11-02T15:42:29Z 2010-11-02T15:42:45Z 2010-11-02T15:42:29Z 2010-11-02T15:42:45Z 2010-08 2010-11-02 August 2010
dc.description.abstract Galaxy redshift surveys are powerful probes of cosmology. Yet, in order to fully exploit the information contained in galaxy surveys, we need to improve upon our understanding of the structure formation in the Universe. Galaxies are formed/observed at late times when the density field is no longer linear so that understanding non-linearities is essential. In this thesis, we show that, at high redshifts, we can accurately model the galaxy power spectrum in redshift space by using the standard cosmological perturbation theory. Going beyond the power spectrum, we can use the three-point function, or the bispectrum, to gain important information on the early universe as well as on the galaxy formation via measurements of primordial non-Gaussianity and galaxy bias. We show that the galaxy bispectrum is more sensitive to primordial non-Gaussianities than previously recognized, making high-redshift galaxy surveys a particularly potent probe of the physics of inflation. Weak lensing offers yet another way of probing cosmology. By cross correlating the angular position of galaxies with the shear measurement from galaxy lensing or CMB lensing, we also show that one can obtain the information on cosmological distance scale, the galaxy bias, and the primordial non Gaussianity from weak lensing method.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subject Cosmology
dc.subject High redshift galaxy surveys
dc.subject Redshift survey
dc.subject Perturbation theory
dc.subject Primordial non-Gaussianity
dc.subject Dark energy
dc.subject Inflationary universe
dc.title Cosmology with high (z>1) redshift galaxy surveys 2010-11-02T15:42:45Z
dc.contributor.committeeMember Bromm, Volker
dc.contributor.committeeMember Hill, Gary
dc.contributor.committeeMember Seljak, Uros
dc.contributor.committeeMember Shapiro, Paul
dc.description.department Astronomy
dc.type.genre thesis
dc.type.material text Astronomy Astronomy University of Texas at Austin Doctoral Doctor of Philosophy

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