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Cosmology in the Nonlinear Regime with Weak Gravitational Lensing.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Cosmology in the Nonlinear Regime with Weak Gravitational Lensing./
Author:	Liu, Jia.
Description:	1 online resource (161 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.
Subject:	Astronomy. -
Online resource:	click for full text (PQDT)
ISBN:	9781339865256

Cosmology in the Nonlinear Regime with Weak Gravitational Lensing.
Liu, Jia.

Cosmology in the Nonlinear Regime with Weak Gravitational Lensing. - 1 online resource (161 pages)

Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.

Thesis (Ph.D.)--Columbia University, 2016.

Includes bibliographical references

This thesis investigates weak lensing (WL) of galaxies and the cosmic microwave back- ground (CMB) in the nonlinear regime. WL describes the effect of bending of background light rays by foreground matter ("lens"). It is sensitive to the large scale structure of the universe, and hence is a promising method to answer some unsolved fundamental questions in physics, such as the nature of dark energy and the total mass of neutrinos. WL datasets of unprecedented precision will come on-line in the early 2020s. This presents an exciting yet challenging task for the WL community: how do we extract the maximum amount of information from lensing observables, while minimizing the impact of systematics?

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781339865256Subjects--Topical Terms:

593935
Astronomy.
Index Terms--Genre/Form:

554714
Electronic books.

Cosmology in the Nonlinear Regime with Weak Gravitational Lensing.
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500 $a Source: Dissertation Abstracts International, Volume: 77-12(E), Section: B.
500 $a Adviser: Zoltan Haiman.
502 $a Thesis (Ph.D.)--Columbia University, 2016.
504 $a Includes bibliographical references
520 $a This thesis investigates weak lensing (WL) of galaxies and the cosmic microwave back- ground (CMB) in the nonlinear regime. WL describes the effect of bending of background light rays by foreground matter ("lens"). It is sensitive to the large scale structure of the universe, and hence is a promising method to answer some unsolved fundamental questions in physics, such as the nature of dark energy and the total mass of neutrinos. WL datasets of unprecedented precision will come on-line in the early 2020s. This presents an exciting yet challenging task for the WL community: how do we extract the maximum amount of information from lensing observables, while minimizing the impact of systematics?
520 $a This work attempts to answer this question by studying non-Gaussian statistics. Traditionally, WL data are analyzed using second-order statistics, which capture all the cosmological information if the density field is Gaussian. However, the small-scale density fluctuations are strongly non-Gaussian and can be highly sensitive to cosmology. Thus we need higher order (non-Gaussian) statistics to utilize these features in the nonlinear regime. In this thesis, we study the constraining power on cosmology and relevant systematics of non-Gaussian statistics, with a focus on convergence peaks. We present the first cosmological constraints using peak counts of the CFHTLenS survey. We also quantify the impact of magnification and size bias, one type of lensing systematics, on the lensing power spectrum and peaks. Finally, going beyond galaxy lensing, we cross-correlate Planck CMB lensing maps with CFHTLenS galaxy lensing maps, to investigate various WL systematics.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Astronomy. $3 593935
650 4 $a Astrophysics. $3 646223
650 4 $a Physics. $3 564049
655 7 $a Electronic books. $2 local $3 554714
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710 2 $a Columbia University. $b Astronomy. $3 1189248
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