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SUMMARY:Physics Colloquium - Sukanya Chakrabarti
DESCRIPTION:Speaker: Sukanya Chakrabarti\, Ph. D.\, Pei-Ling Chan Endowed Chair and Professor\, School of Physics and Astronomy\, University of Alabama-Huntsville \nThe Precision Frontier of Dark Matter Constraints from Direct Acceleration Measurements \nFor over a century\, our understanding of dark matter has hinged on kinematic estimates derived from static snapshots of stellar positions and velocities. However\, these methods are inaccurate for a time-dependent potential\, and there are now many lines of observational evidence that show that our Galaxy has had a highly dynamic history. We have now entered an era where we can carry out precision time-series measurements of the accelerations of stars that live within the gravitational potential of our Galaxy. \nI will discuss our comprehensive observational strategy to directly measure Galactic accelerations. Central to this discussion is our recent analysis of compiled pulsar timing data from which we were able to measure the Galactic acceleration for the first time\, and derive fundamental Galactic parameters. Discernible differences in sub-structure exist among popular dark matter models on small scales\, presenting testable nuances. I will discuss the potential for measuring dark matter sub-structure in the Milky Way by leveraging the diverse set of techniques we have developed\, including pulsar timing\, eclipse timing\, and extreme-precision radial velocity observations. I will review our results from our multi-pronged observing campaign\, and end by discussing synergies between Galactic dark matter constraints and constraints on theories of gravity. \nLocation: Chemistry 108 \nTime: 3:30PM – 5:00PM \nDate: May 2nd\, 2025 \n 
URL:https://uwm.edu/physics/event/physics-colloquium-sukanya-chakrabarti/
LOCATION:Chemistry 108\, 2050 E Kenwood Blvd\, Milwaukee\, WI\, 53201\, United States
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