EPT Seminar - Yuhsin Tsai, University of Notre Dame

Speaker: Yuhsin Tsai, University of Notre Dame


Title: Probing Extended Dark-Sector Objects with Cosmological Perturbations

Abstract: I will discuss large-scale cosmological perturbations sourced by a variety of extended objects, including first-order phase-transition bubbles, domain walls, ultralight dark matter, and magnetic fields. These objects can be produced in the early or late Universe and leave observable signatures through their gravitational effects. I will highlight their common features, as well as distinctive signatures such as enhanced large-scale perturbations from domain walls and non-Gaussianity from ultralight dark matter. I will conclude by discussing current constraints and future prospects for probing these elusive sources through cosmological observations.

EPT Zoom link: https://umd.zoom.us/j/98156909829?pwd=HKSCcZchnrAY9ncEKmUoW47Cve7XAJ.1
Meeting ID: 981 5690 9829
Passcode: UMDEPT