Theoretical Aspects of Cosmic Shear and its Ability to constrain Cosmological Parameters
Bibliographic record
Abstract
In the last decade weak gravitational lensing by the large-scale structure of the Universe, also called cosmic shear, has become an important tool to constrain cosmological parameters. Despite this success there remain observational and theoretical issues which must be solved to fully investigate the cosmological information of future cosmic shear data. In this PhD thesis I address several of these issues. <br /> As a first project I use ray-tracing simulations to compare and optimize cosmic shear data vectors. More precisely, I develop a new data vector by combining two cosmic shear measures, namely the aperture mass dispersion (<M<sup>2</sup><sub>ap</sub>>) and the two-point correlation function (2PCF). The new data vector has higher information content than a <M<sup>2</sup><sub>ap</sub>> data vector and is more robust against contamination compared to a 2PCF data vector. In my second project on cosmic shear measures I examine the ring statistics, which is the most recently developed cosmic shear measure. The ring statistics improves on deficits in the E- and B-mode decomposition of commonly used cosmic shear measures, e.g. the aperture mass dispersion. I optimize the signal strength of the ring statistics, develop an expression for its covariance, and compare its information content to that of the aperture mass dispersion. I find that the ring statistics' data points are less correlated and that a ring statistics' data vector contains more information on cosmological parameters. Finally, I employ the ring statistics to measure a cosmic shear signal from data of the Canada-France-Hawaii Telescope Legacy Survey and constrain cosmological parameters. As a result I obtain s<sub>8</sub> (O<sub>m</sub> / 0.25)= 0.82<sup>+0.02</sup><sub>-0.04</sub>. <br /> As a third project I examine cosmic shear covariances and their impact on cosmological parameter constraints. Using simulated data I investigate the cosmology-dependence of these covariances and develop improved methods for a likelihood analysis, which take the cosmology-dependence into account. In addition to the cosmology-dependence, I examine how the shear fields' non-Gaussianity affects cosmic shear covariances and the parameter constraints (in particular for dark energy parameters). I quantify the impact of non-Gaussianity as a function of angular scale and derive a fit-formula for the calculation of non-Gaussian covariances from Gaussian ones.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".