Aspects of cosmic acceleration

Vardanyan, V. (2019)

Doctoral Thesis

The focus of the dissertation "Aspects of cosmic acceleration" is the study of possible mechanisms responsible for the late-time accelerated expansion of the universe. It has 5 main chapters. In the first chapter I have given an overview of modern cosmology. Particularly, an introduction to cosmological perturbation theory, and a general overview of the cosmological standard model, as well as an overview to beyond-standard-model scenarios is presented. Chapter two discusses cosmological models based on the so-called alpha-attractor framework. Chapter three is dedicated to the study of constraints imposed by gravitational wave observations on the so-called doubly-coupled massive bimetric gravity theory. Chapter four studies the cosmological stability of the so-called massive mimetic gravity theory. Finally, Chapter five studies the effect of the Symmetron gravity on the so-called splashback radius of dark matter halos.

• Cosmology
• Dark Energy
• Modified Gravity
• Massive Gravity
• Symmetron Screening
• Splashback

• All authors: Vardanyan, V.
• Supervisor: Achúcarro, A.
• Co-supervisor: Silvestri, A.
• Committee: Amendola, L.; Davis, A.C.; Eliel, E.R.; Hoekstra, H.
• Qualification: Doctor (dr.)
• Awarding Institution: Lorentz Institute and Leiden Observatory, Faculty of Science, Leiden University
• Date: 2019-09-18
• Title of host publication: Casimir PhD Series
• ISBN (print): 9789085934141
• Name: 2019-31