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Cosmological Vector Fields And Constraining The Neutrino Masses, Avery J. Tishue
Cosmological Vector Fields And Constraining The Neutrino Masses, Avery J. Tishue
Dartmouth College Ph.D Dissertations
In this thesis I explore two main topics: the role and consequences of cosmological vector fields, and new ideas for constraining fundamental physics with state-of-the-art experiments. These topics are disparate in content and technique but unified in their attempt to leverage novel approaches to better understand longstanding questions in cosmology. These questions, such as ``What is causing the universe to accelerate today?'' and ``What are the neutrino masses?'', underpin the modern cosmological paradigm. They play a key role in our understanding of cosmic history, the formation of structure, and the fate of our universe. Answers to or hints about these …
Evolution Of Density And Velocity Perturbations In A Slowly Contracting Universe, Olivia R. Bitcon
Evolution Of Density And Velocity Perturbations In A Slowly Contracting Universe, Olivia R. Bitcon
Honors Undergraduate Theses
One focus of research in cosmology regards the growth of structure in the universe: how we end up with stars, galaxies, galaxy clusters, and large scale structure in a universe that appears homogeneous and isotropic on large scales. Using cosmological perturbation theory, we investigate the evolution of density and velocity perturbations corresponding to a universe that is slowly contracting (Ijjas and Steinhardt), testing with and comparing different values for the equation-of-state parameter. This allows for the comparison of the growth of large scale structure in scenarios including a matter-dominated expanding universe, a dark energy-dominated expanding universe, and now, an ekpyrotic …