PIRSA:21020052

Light echos and coherent autocorrelations in a black hole spacetime

Chesler, P. (2021). Light echos and coherent autocorrelations in a black hole spacetime. Perimeter Institute. https://pirsa.org/21020052

Chesler, Paul. Light echos and coherent autocorrelations in a black hole spacetime. Perimeter Institute, Feb. 25, 2021, https://pirsa.org/21020052 

          @misc{ pirsa_PIRSA:21020052,
            doi = {10.48660/21020052},
            url = {https://pirsa.org/21020052},
            author = {Chesler, Paul},
            keywords = {Strong Gravity},
            language = {en},
            title = {Light echos and coherent autocorrelations in a black hole spacetime},
            publisher = {Perimeter Institute},
            year = {2021},
            month = {feb},
            note = {PIRSA:21020052 see, \url{https://pirsa.org}}
          }

Paul Chesler

Massachusetts Institute of Technology (MIT) - Department of Physics

Talk number
PIRSA:21020052
Collection
Talk Type
Subject
Abstract

Light rays can orbit the photon shell of a black hole many times before escaping to infinity.  This means that a distant observer can see a successive series of "echo"  images, each separated in time by the photon shell orbital period, and each dimmer than the previous.  I will present a study of light echos using coherent autocorrelation functions sourced by fluctuating matter in accretion flows.  I will demonstrate that coherent autocorrelation functions are peaked at integer multiples of the photon shell orbital period.  Furthermore, I will argue that the power in echos from supermassive black holes is too small to be observed on Earth.

Zoom Link: https://pitp.zoom.us/j/92751681169?pwd=V0hQeUMwaWtTQjQ3UzdxekJiT0lmQT09