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Title:Fundamental physics from observations of the early universe
Author(s):Khatri, Rishi
Director of Research:Wandelt, Benjamin D.
Doctoral Committee Chair(s):Wandelt, Benjamin D.
Doctoral Committee Member(s):Fields, Brian D.; Gammie, Charles F.; Sutton, Edmund C.
Department / Program:Astronomy
Discipline:Astronomy
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Physical Cosmology
Early Universe
Fundamental Constants
21-cm Cosmology
Cosmic Microwave Background
Second Order Perturbation Theory
Cosmic Strings
Abstract:The current experiments like Planck and future CMB, 21-cm and other large scale structure surveys will enable cosmology to answer some of the fundamental questions in physics. The linear perturbation theory may not be accurate enough to interpret the observations from Planck and future CMB experiments. Second order effects may in particular be important in constraining the non-Gaussianity in the initial conditions of the Universe. Inhomogeneities in recombination and reionization amplify the perturbations in the underlying matter density and the resulting second order effects may be important. I calculate the bispectrum due to these second order effects and find that they are not an important source of confusion with the primordial non-Gaussianities. 21-cm observations of the era between the recombination and reionization will provide a wealth of data in the future. I study what we can learn about fundamental physics from these observations. In particular I calculate the constraints we might get from the future data on the existence and properties of cosmic strings, a prediction of GUT and superstring theories, and the variation of fundamental constants.
Issue Date:2010-08-20
URI:http://hdl.handle.net/2142/16725
Rights Information:Copyright 2010 by Rishi Khatri.
Date Available in IDEALS:2010-08-20
Date Deposited:2010-08


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