• Aspects of inflationary cosmology 

      Lorshbough, Dustin Eldon (2016-05)
      We discuss aspects of excited initial states in inflationary cosmology. We review the basic framework of inflationary cosmology and how to compute observable correlation functions. The framework of excited initial states ...
    • Aspects of new physics beyond the standard model : electroweak naturalness, dark matter and holographic quantum gravity 

      Swaminathan, Sivaramakrishnan
      This dissertation is based on studies of three aspects of physics beyond the Standard Model. First, we summarize a study of high temperature symmetry restoration in extensions of the Standard Model where the naturalness ...
    • Boundary conditions for black holes using the Ashtekar isolated and dynamical horizons formalism 

      Schirmer, Jerry Michael (2010-12)
      Isolated and Dynamical horizons are used to generate boundary conditions upon the lapse and shift vectors. Numerous results involving the Hamiltonian of General relativity are derived, including a self-contained derivation ...
    • Chiral symmetry breaking and external fields in the Kuperstein-Sonnenschein model 

      Alam, Muhammad Sohaib (2012-05)
      A novel holographic model of chiral symmetry breaking has been proposed by Kuperstein and Sonnenschein by embedding non-supersymmetric probe D7 and anti-D7 branes in the Klebanov-Witten background. We study the dynamics ...
    • Classical and semi-classical analysis of Klein-Gordon field in a signature transition spacetime 

      Suazo, Luis Ricardo (2018-06-25)
      Classical and semiclassical analyses of a Klein-Gordon field minimally coupled to a fixed, signature-changing (Riemannian to Lorentzian) background are performed. The background spacetime is a toy model used to represent ...
    • Cosmology driven by physics beyond the standard model 

      Žanić, Marija, 1972- (2007-12)
      This dissertation investigates several problems inspired by the interplay of cosmology and theories beyond the Standard Model of particle physics. The first part of this work is a study of time evolution of unstable ...
    • Dynamics of asymptotically AdS spaces and holography 

      Pedraza Avella, Juan Felipe; 0000-0002-3276-9290 (2015-08)
      This thesis presents a series of studies on the evolution and out-of-equilibrium dynamics of strongly coupled quantum field theories by means of the AdS/CFT correspondence. We use a handful of analytic and semi-analytic ...
    • Geometry of quantum noise 

      Dixit, Kuldeep Narayan (2010-05)
      Open quantum systems refer to systems that are affected by interaction with the environment. The effects of these unwanted interactions, called \emph{quantum noise}, are studied using dynamical maps. We study the geometry ...
    • High-energy emission and recent afterglow studies of gamma-ray bursts 

      Barniol Duran, Rodolfo Jose (2011-05)
      Gamma-ray Bursts (GRBs) are powerful explosions that emit most of their energy, as their name suggests, in gamma-rays of typical energies of about 1 MeV. This emission lasts for about two minutes or less and it is ...
    • Inflation : connecting theory to observation 

      Meyers, Joel Ray, 1983- (2012-08)
      The inflationary paradigm has become widely accepted as an accurate framework in which to describe the physics of the early universe, due both to the conceptual advantages of the idea and the agreement of its predictions ...
    • Measuring frame-dragging with LARES, and other topics in gravity 

      Nguyen, Phuc Hong (2017-05)
      This dissertation is divided into two conceptually distinct parts, which both fall under the broad umbrella of gravitational physics. In the first part, we describe work done on the LARES experiment whose goal is to measure ...
    • Mirror symmetry in three dimensional supersymmetric gauge theories 

      Dey, Anindya, Ph. D. (2015-08)
      The basic objective of this thesis is to apply techniques of supersymmetric localization for studying Mirror Symmetry in N = 4 gauge theories in three space-time dimensions. We start by discussing an M-theory/Type IIA ...
    • Modeling and constraining inflationary and pre-inflationary eras 

      Aravind, Aditya; 0000-0002-8661-2336 (2016-08)
      The paradigm of cosmic inflation has had great success in explaining the statistical properties of fluctuations in the Cosmic Microwave Background (CMB). In this dissertation we discuss a few avenues for modeling and ...
    • Non-supersymmetric holographic engineering and U-duality 

      Young, Stephen Christopher (2012-08)
      In this Ph.D. thesis, we construct and study a number of new type IIB supergravity backgrounds that realize various flavored, finite temperature, and non-supersymmetric deformations of the resolved and deformed conifold ...
    • On explaining GRB prompt spectrum with photospheric emission model 

      Bhattacharya, Mukul (2018-05-07)
      In this thesis, we present our work towards understanding the radiation mechanism of Gamma Ray Bursts (GRBs) during prompt emission phase. We study the spectra of photospheric emission from highly relativistic gamma-ray ...
    • Perturbations in the cosmic microwave background caused by excited quantum states and connection to observation 

      Malnar, Jason (2013-05)
      I studied the effect of excited state initial conditions on the inflationary perturbation wavefunction and the possible effects they have on the observed spectrum of primoridal fluctuations. A de Sitter Universe approximation ...
    • Stability issues in Kalb-Ramond/dilaton braneworld scenarios 

      Young, Stephen Christopher. (2009-12)
      I summarize the Randall-Sundrum braneworld scenario, and its application to solving the hierarchy problem in the Standard Model of elementary particles. A generalized Randall-Sundrum scenario is presented, which includes ...
    • Techniques for discoveries at the TeV scale 

      Klimek, Matthew David; 0000-0002-4094-6234 (2017-05)
      Several lines of indirect evidence point to the existence of new physics at the TeV scale, corresponding to the scale set by electroweak symmetry breaking. The search for new phenomena at this scale is a major focus of ...
    • The deconstruction of orbifold fixed points in heterotic M-theory 

      Claussen, Jacob Cole; 0000-0002-1529-1774 (2016-08)
      The compactification of E8 X E8 heterotic string theory on orbifolds of the form T6=ZN produces a 4D spectrum of untwisted states and twisted states. Unlike the untwisted states, the twisted states are confined to the fixed ...
    • Tinkertoys for Gaiotto duality 

      Chacaltana Alarcon, Oscar Chacaltana (2011-08)
      We describe a procedure for classifying 4D N=2 superconformal theories of the type introduced by Davide Gaiotto. Any punctured curve, C, on which the 6D (2,0) SCFT is compactified, may be decomposed into 3-punctured spheres, ...