COSMOLOGICAL IMPLICATIONS OF MODIFIED GRAVITY: SPHERICAL COLLAPSE AND HIGHER ORDER CORRELATIONS

Loading...
Thumbnail Image
Degree type
Doctor of Philosophy (PhD)
Graduate group
Physics & Astronomy
Discipline
Subject
modified gravity
large scale structure
Astrophysics and Astronomy
Cosmology, Relativity, and Gravity
Funder
Grant number
License
Copyright date
Distributor
Related resources
Contributor
Abstract

In the Standard Model of Cosmology the nature of the Dark Energy has become one of the most significant and conceptual challenges to be resolved. One of the possible approaches to solving it is to introduce modifications to General Relativity, that include Chameleon effects, which allow for a change in the strength of gravity based on the environment. This can provide for a consistent explanation of both large-scale observations and Solar system experiments. In the task to distinguish them from the LCDM model of gravity, or any other competing explanation, we need to study the consequences of these modifications for the growth of perturbations. In this thesis a recently developed Chameleon f(R) modification to gravity is explored. We study its consequences for the distribution of matter on large scale using the Bispectrum. Using 1D simulations we examine the formation of galaxy and cluster halos and its observational effects. Finally we present an investigation of a method for studying gravitational lensing.

Advisor
Bhuvnesh Jain
Date of degree
2009-12-22
Date Range for Data Collection (Start Date)
Date Range for Data Collection (End Date)
Digital Object Identifier
Series name and number
Volume number
Issue number
Publisher
Publisher DOI
Journal Issue
Comments
Recommended citation