Northwestern Events Calendar

Nov
29
2022

Astro Seminar: Ue-Li Pen:"Coherent cosmological radiation: FRBs and gravitational waves"

When: Tuesday, November 29, 2022
3:45 PM - 4:45 PM Central

Where: 1800 Sherman Avenue, 7-600, Evanston, IL 60201 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Joan West   (847) 491-3685

Group: Physics and Astronomy Astrophysics Seminars

Category: Academic

Description:

FRBs and gravitational waves are the only distant sources sufficiently coherent to exhibit wave optics phenomena in their propagation.  Nominally FRBs probe affects with equivalent strain h~10^{-26), one of the most sensitive observables. I discuss new observables, including precision microlensing interferometry sensitive to extragalactic planets and constraints on scalar gravity.  Wave optics presents new theoretical challenges, some of which Picard-Lefschetz theory resolves.  The introduction of complex images opens the inference of time delay measurements even when no real lensed images are formed.

Speaker: Ue-Li Pen, Professor CITA University of Toronto

Host: Professor Dr.Giacomo Fragione, Research Assistant Professor, CIERA

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