Browsing Science (Faculty of) by Subject "quantum gravity"
Now showing items 1-13 of 13
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At the Corner of Space and Time
(University of Waterloo, 2019-12-09)We perform a rigorous piecewise-flat discretization of classical general relativity in the first-order formulation, in both 2+1 and 3+1 dimensions, carefully keeping track of curvature and torsion via holonomies. We show ... -
Causal Models for a Quantum World
(University of Waterloo, 2016-05-18)Quantum mechanics has achieved unparalleled success as an operational theory, describing a wide range of experiments to remarkable accuracy. However, the physical foundations on which it rests remain as puzzling as they ... -
Cosmic Acceleration As Quantum Gravity Phenomenology
(University of Waterloo, 2010-09-22)The discovery of cosmic acceleration has prompted the need for a new understanding of cosmology. The presence of this acceleration is often described as the dark energy problem or the Lambda problem.The simplest explanation ... -
Cosmic Atoms: from Causal Sets to Clusters
(University of Waterloo, 2014-08-19)This thesis is a collection of works which seek to address certain aspects of the following puzzles: quantum gravity, initial conditions of the universe, the cosmological constant problem, and baryonic processes in clusters ... -
Generalized holographic dualities for metric gravity & Quantum geometry based on area variables
(University of Waterloo, 2020-09-18)Holography holds promise for simplifying computations in quantum gravity. In part I of this thesis, we construct holographic boundary theories for linearized gravity, for a general family of finite or quasi-local boundaries, ... -
Higher dimensional Taub-NUT spaces and applications
(University of Waterloo, 2006)In the first part of this thesis we discuss classes of new exact NUT-charged solutions in four dimensions and higher, while in the remainder of the thesis we make a study of their properties and their possible applications. ... -
An Operational Road towards Understanding Causal Indefiniteness within Post-Quantum Theories
(University of Waterloo, 2022-01-07)A theory, whatever it does, must correlate data. We commit ourselves to operational methodology, as a means towards studying the space of Generalised Probability Theories that are compatible with Indefinite Causality. Such ... -
Path Integrals in the Sky: Classical and Quantum Problems with Minimal Assumptions
(University of Waterloo, 2019-10-24)Cosmology has, after the formulation of general relativity, been transformed from a branch of philosophy into an active field in physics. Notwithstanding the significant improvements in our understanding of our Universe, ... -
Quantum Aspects of Black Holes: From Microstates to Echoes and Somewhere In-Between
(University of Waterloo, 2023-05-23)In this thesis we explore quantum aspects of black holes from a variety of perspectives. In part I of this thesis we are motivated by the black hole information paradox to explore the idea of gravitational wave echoes ... -
Quantum Black Holes in the Sky
(University of Waterloo, 2020-09-30)Black Holes are possibly the most enigmatic objects in our Universe. From their detection in gravitational waves upon their mergers, to their snapshot eating at the centres of galaxies, black hole astrophysics has undergone ... -
Quantum pre-geometry models for Quantum Gravity
(University of Waterloo, 2012-08-23)In this thesis we review the status of an approach to Quantum Gravity through lattice toy models, Quantum Graphity. In particular, we describe the two toy models introduced in the literature and describe with a certain ... -
Space and Particles at the Planck Scale
(University of Waterloo, 2007-09-10)The aim of this thesis is to summarize some results in two approaches to studying how quantum gravity may be relevant for experiments. The first approach starts off by stating that one of the questions a theory of quantum ... -
Topological methods in quantum gravity
(University of Waterloo, 2005)The main technical problem with background independent approaches to quantum gravity is inapplicability of standard quantum field theory methods. New methods are needed which would be adapted to the basic principles ...