Cosmological weak lensing probes can inform us of the contents and evolution of the universe, including the properties of dark matter and dark energy, which collectively make up $\sim 95\%$ of the universe. We live in an exciting period in scientific history; large scale astronomical surveys such as the Legacy Survey of Space and Time (LSST) will s...
The document presents the application of the Bootstrap method to Fisher matrices to analyze uncertainties in parameter estimation. It combines two Fisher matrices (like spectroscopic and photometric probes in EUCLID cosmology survey) using two approaches: one based on combining eigenvectors and another utilizing linear combinations with Dirichlet w...
While the Standard Model of particle physics and the $\Lambda$CDM model of cosmology have been celebrated for their explanatory prowess, many phenomena remain unexplained. In this dissertation, we explore several methods of inquiry into these enigmas. In Chapters 2 and 3, we scrutinize signals that may hint at the presence of dark matter, and devel...
Published in Nature
The polarization of the Cosmic Microwave Background (CMB) is at the center of attention of the cosmological community, as the observable possibly offers a view of primordial gravitational waves. A signature from an early-universe gravitational wave background would be imprinted on the parity-odd pattern of the CMB polarization, namely the B-modes. ...
The number and quality of large-scale structure (LSS) surveys is already stretching current methods of learning about cosmology from data to their capacity. However, the pace of data streaming in will increase significantly, with, at the time of writing, data from the Dark Energy Spectroscopic Instrument (DESI), Euclid, Rubin, Spectro-Photometer fo...
This thesis investigates the archaeological material beneath the fairy tale Frau Holle through well deposits. Wells used to serve a ritual purpose, but our understanding of these rituals is limited. By bridging the gap between archaeology and ethnography, this thesis aims to uncover how fertility beliefs were ritually expressed in wells and how far...
In this dissertation, I used early-type galaxies (ETGs) at intermediate redshifts (0.25
Highlighting evidence for the dual cultural affiliation of the texts and diagrams of the Liber Nemroth to both Middle Eastern cosmological doctrines and the scientific context of the Carolingian period. Method: investigation of the cosmological doctrines and calculation methods of the LN for traces of 'Chaldean' roots, and comparison with the Carol...
This thesis presents new directions for cosmological data analysis using Bayesian techniques and machine learning. First, I introduce a novel machine learning spectroscopic analysis technique to detect absorption systems in the Lyman-α forest. Using Gaussian processes, I build data-driven models for the quasar emission and apply Bayesian model sele...
