Tuan Do (Astronomy) - UC Los Angeles
Title: Testing Fundamental Physics with Orbits at the Galactic Center
Abstract: The closest approach of the star S0-2 to the supermassive black hole Sgr A* in 2018 opened a new era of tests of gravity with stellar orbits at the Galactic center. I will discuss the measurement of the gravitational redshift of S0-2 using radial velocity and astrometry measurements from 24 years of data, including data from 2018. This measurement allows us to test Einstein's Equivalence Principle, a fundamental component of General Relativity. I will discuss the prospects for additional tests of the nature of gravity around a supermassive black hole with current and future data, including a recent test for variations in fine structure constant. I will also discuss the next revolution in the study of stellar orbits that will come with future giant ground-based telescopes such as TMT and ELT.
Bio: Tuan Do received his undergraduate degrees in Physics and Astrophysics at UC Berkeley in 2004 and his PhD at UCLA in 2010. He was a TMT postdoctoral fellow at UC Irvine until 2012, when he joined the Dunlap Institute as a Dunlap Fellow until 2014. He returned to UCLA in 2015 as a research scientist and joined the Physics and Astronomy Department faculty in 2020.