PIRSA:21020052 Scientific Series Strong Gravity

DOI10.48660/21020052

Series: Strong Gravity

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}}
}

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

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