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Physics Colloquium – Helvi Witek
Physics Colloquium – Helvi Witek
CSI Gravity: Investigating Mysteries of Fundamental Physics with Black Holes
Dr. Helvi Witek, Asst. Professor, Dept. of Physics, UIUC
Black holes are among the most exciting predictions of Einstein's theory of general relativity, composed of the fabric of spacetime itself. Observations of black holes offer unique access to extreme gravity, and they enable us to investigate long-standing puzzles in fundamental physics ranging from dark matter to the very nature of gravity itself.
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Physics Colloquium – Sarah Vigeland
Physics Colloquium – Sarah Vigeland
Searching for a Gravitational Wave Background with Pulsar Timing Arrays
Sarah Vigeland, Asst. Professor, Dept. of Physics, UW-Milwaukee
Pulsar timing arrays use observations of millisecond pulsars to detect nanohertz gravitational waves. The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) Collaboration has recently released their 15-year data set containing observations of 68 millisecond pulsars. These data contain evidence for Hellings-Downs correlations, which are characteristic of a gravitational wave background.