Precision cosmology from small-scale CMB observations

Jense, Hidde 2024. Precision cosmology from small-scale CMB observations. PhD Thesis, Cardiff University. Item availability restricted.

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Abstract

Recent developments in cosmological observables are leading to an era of precision cosmology. At the forefront are observations of the Cosmic Microwave Background (CMB), which are capable of testing entire cosmological models by themselves. I present an overview of the development of CMB observations with legacy space-, and modern ground-based observatories, as well as the work done on the creation of new, modern Bayesian likelihood codes capable of constraining cosmological parameters from these observations. Additionally, developments in machine learning have allowed for accelerated inference by using neural network emulators. I present work on the development of a complete software suite with the CosmoPower emulator framework, opening new avenues for the prescription, creation, and application of new high-accuracy emulators that are applicable for these precise measurements. Finally, I bring all this work together in an overview of the work done on the upcoming data release (DR6) of the Atacama Cosmology Telescope (ACT). This work entails the development and testing of the ACT DR6 likelihood for both standard and extended cosmologies on a suite of purpose-built simulations. When published, the future ACT DR6 release will include small-scale temperature and polarization data of the CMB that will provide the most stringent cosmological tests from the CMB alone to date.

Item Type:	Thesis (PhD)
Date Type:	Completion
Status:	Unpublished
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Uncontrolled Keywords:	• astronomy • cosmology • CMB • Bayesian inference • Machine learning
Funders:	College Funded
Date of First Compliant Deposit:	13 January 2025
Last Modified:	13 Jan 2025 12:45
URI:	https://orca.cardiff.ac.uk/id/eprint/175204

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