Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"Weak Lensing"”.
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Cosmology with Weak Lensing Peaks
… have shown that the number counts of peaks in weak lensing (WL) surveys contain significant cosmological information. Motivated by this finding, in the first part of the thesis, we address two questions: (i) what is the physical origin of WL peaks; and (ii) how much information do the peaks …
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Relativistic corrections to weak lensing convergence
… (CMB), Baryon Acoustic Oscillation (BAO) and weak lensing have been carried out to try to understand the nature of this repulsive dark force. With the advent of advanced experiments like the Square Kilometer Array we enter the era of precision cosmology where measurements of effects such as …
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Weak lensing flexion as a probe of galaxy cluster substructure
… I also present a novel method for measuring weak gravitational lensing flexion to inform mass measurements on small scales. While previously published methods for measuring flexion focus on measuring derived properties of the lensed images, such as shapelet coefficients or surface brightness …
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Testing New Weak Lensing Measurement Techniques With The Dark Energy Survey
… it to have a likely negligible impact on the weak gravitational lensing measurements conducted with images taken during high wind. We then present the methods and validation of two new techniques in weak lensing shear and magnification measurement. We demonstrate highly accurate recovery of …
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The Weak Lensing Hat-Trick: Constraining Cosmology with Galaxy, CMB, and Kinematic Lensing
We are entering an exciting decade in which weak gravitational lensing surveys are probing the universe with unparalleled volume and precision. These surveys will produce not only high-quality images of hundreds of millions of galaxies and high-resolution microwave sky maps, but also create …
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Mass profiles of clusters of galaxies : a comparison of X-ray and weak lensing observations
… comparison of mass estimates from X-rays and weak gravitational lensing for a sample of 32 intermediate low redshift clusters, and study the dependence of the mass profiles derived from these techniques on the dynamical state of the clusters. We analyze Chandra X-ray observations and compare …
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Modeling Astrophysical and Large-Scale Structure Signatures in Axion Cosmologies
… scales. We begin by studying density, shape and weak lensing statistics in FDM cosmologies, finding strong departures from the universality of density profiles and the monotonicity of shape profiles observed in the vanilla cold dark matter (CDM) model. Our first-ever analysis of geometric and …
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Cosmic acceleration and the coincidence problem
… (CMB), Large Scale Structure (LSS), and Weak Lensing (WL). This confirmation however, lacks a fundamental physics explanation. The hypothetical form of energy termed 'dark energy' (DE) assumed to account for that acceleration behavior, is still mysterious and why its dominance only …
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Jet Definitions in Effective Field Theory and Decaying Dark Matter
… Lyman-alpha forest, large scale structure, and weak lensing observations. Astrophysical constraints are not considered in this thesis. The bounds on the lifetime of decaying dark matter are dominated by either the late-time integrated Sachs-Wolfe effect for the scenario with weak reionization, …
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Constraining fundamental physics from cosmology
… my results are important for future galaxy and weak lensing surveys.
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Projected Angular Statistics for Large-scale Structure Cosmology
… or without redshift-space distortions) and the weak lensing of galaxies and the CMB. The method makes use of flat-sky methods but includes integration over all line-of-sight wave-modes. With suitable geometrical recalibration, it is shown that this approach is highly accurate even at low …
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Tests of the Planck Cosmology at High and Low Redshifts
… redshift measurements of the Hubble constant and weak gravitational lensing. In this thesis, we review possible tensions and extensions to the Planck cosmology, at both high and low redshifts. We begin with the high redshift analysis, using the Planck data to test models which introduce …
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Clestial harmonics - Applications of Angular Power Spectra to Problems in Astroparticle and Cosmological Physics
… Dark Matter particle candidates belonging to the Weakly Interacting Massive Particle (WIMP) class, endowed with masses spanning the GeV-TeV energy scale. The subject is dealt with in terms of a statistical cross-correlation formalism between the 2MRS galaxy clustering spectroscopic sample and the …