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Full-Text Articles in Physical Sciences and Mathematics
Radio Pulsar Searching And Timing Follow-Up, Alexander Eli Mcewen
Radio Pulsar Searching And Timing Follow-Up, Alexander Eli Mcewen
Theses and Dissertations
Pulsars provide some of the richest laboratories for studying the behavior of ultra-dense matter. As such, they have been utilized for decades to place stringent limits on gravitation and as probes of the material that fills our Galaxy. These tests benefit greatly from a catalog of pulsars that is as complete as possible, which in turn requires thorough searches of the Galaxy and precise timing of discoveries. These searches are informed by the continued characterization of the pulsar population, and so searching techniques develop in tandem with the analysis of their discoveries. Large scale pulsar surveys find pulsars; small scale …
Numerical Simulations Of Tidal Disruption Events, Alexandra Elise Spaulding
Numerical Simulations Of Tidal Disruption Events, Alexandra Elise Spaulding
Theses and Dissertations
The detection of supermassive black holes (SMBH) in our universe has proven to be a challenge. One way to find an SMBH in a quiescent, inactive galaxy is through a tidal disruption event, or a TDE. A TDE occurs when a star is slightly perturbed and is subsequently disrupted by the SMBH. When this happens, part of the debris from the disrupted star remains bound to the SMBH while the rest is unbound. The SMBH accretes the bound matter and reveals their presence by a temporary X-ray flare, lasting a few months. Using conservation of energy, the fallback rate of …
Cosmology, Lensing, And Modified Gravity With Gravitational Waves, Ignacio Magana Hernandez
Cosmology, Lensing, And Modified Gravity With Gravitational Waves, Ignacio Magana Hernandez
Theses and Dissertations
Since the first detection of gravitational waves (GWs) from the merger of two stellar-mass black holes in 2015, the LIGO-Virgo-KAGRA (LVK) Collaboration has accumulated over 90 observations of mergers involving neutron stars and black holes. With the upcoming observing runs for the LVK network of GW detectors, many more binary mergers are expected to be detected. The increasing size of gravitational wave catalogs has enabled the study of their population, its cosmic expansion history, signatures of gravitational wave lensing, and how well these observations agree with general relativity. In this dissertation, I will discuss my contributions to gravitational wave cosmology. …