One of the goals of astrophysics is to obtain a full understanding how the Universe is
organized on large scales and how structure evolved. In this thesis we develop a method of …

We present a detailed review of large-scale structure (LSS) study using the discrete wavelet
transform (DWT). After describing how one constructs a wavelet decomposition we show …

A method for measuring the spectrum of a density field by a discrete wavelet space-scale
decomposition (SSD) has been studied. We show how the power spectrum can effectively …

The angular power spectrum is a powerful statistic for analysing cosmological signals
imprinted in the clustering of matter. However, current galaxy and quasar surveys cover …

Spectroscopic surveys aim to map large fractions of the Universe to study the Large Scale
Structures (LSS). LSS evolution traces the distribution of matter as a result of the tension …

A method for measuring the spectrum of a density field by the discrete wavelet transform
(DWT) is studied. We show how the Fourier power spectrum can be detected by using the …

Abstract Analysis of the Lyman-α forest has proven to be a highly powerful tool in new
physics. With measurements sensitive to small and large scales, it is able to provide insight …

One of the major science goals over the coming decade is to test fundamental physics with
probes of the cosmic large-scale structure out to high redshift. Here we present a fully …

We present a measurement of the 1D Lyα forest flux power spectrum, using the complete
Baryon Oscillation Spectroscopic Survey (BOSS) and first extended-BOSS (eBOSS) quasars …

Over recent decades, spectroscopic surveys have yielded exceptional measurements of the
large-scale structure of the Universe. Notably, they have measured the baryon acoustic …