Now showing items 1-12 of 12

    • Cosmological beam plasma instabilities 

      Shalaby, Mohamad (University of Waterloo, 2017-08-24)
      Blazars are the main source of extragalactic very high energy gamma-rays. These gamma rays annihilate on the extragalactic background light, producing electron-positron pair beams with TeV energies. The pair beams are very ...
    • Leveraging Polarization in the Era of Submillimeter VLBI 

      Ni, Chunchong (University of Waterloo, 2024-06-14)
      With the advancement of technology, global very long baseline interferometry (VLBI) observations at millimeter wavelengths become possible. The Event Horizon Telescope (EHT) is the first such experiment, which makes observing ...
    • Messier 87: A Laboratory for Exploring AGN Variability using the Event Horizon Telescope 

      Jeter, Britton (University of Waterloo, 2020-09-17)
      At a distance of 50 million light years at the heart of the Virgo cluster, lies the giant elliptical galaxy Messier 87. This galaxy has at its center a brilliant relativistic jet, observable at all wavelengths, and at the ...
    • The Nature and Impact of Active Galactic Nuclei 

      Tiede, Paul (University of Waterloo, 2021-08-12)
      The gravitational interaction around the event horizon of black holes presents theoretical challenges. With the advent of the Event Horizon Telescope (EHT), we are now entering an era in physics where we can probe the ...
    • Photon Rings and Shadow Size for General Integrable Spacetimes 

      Salehi, Kiana (University of Waterloo, 2023-08-08)
      According to the no-hair theorem, the unique characteristics of astrophysical black holes are their masses and spins. However, recent observations from the Event Horizon Telescope (EHT) images of M87 and Sgr A* have ...
    • Placing Limits on Light Axions with EHT Polarimetry via Closure Traces 

      Wang, Zhiren (University of Waterloo, 2023-08-31)
      Black holes can amplify incoming bosonic waves via rotational superradiance, inducing bound states of ultralight bosons around them. This phenomenon has the potential to confine the parameter spaces of new bosons. Axions, ...
    • Probing Accretion Turbulence in the Galactic Centre with EHT Polarimetry 

      Ni, Chunchong (University of Waterloo, 2019-01-09)
      We explore the origin and the influence of the interstellar scattering on the observation of Sgr A*, and the method to mitigate this scattering via Event Horizon Telescope (EHT) polarimetry. Interstellar scattering is due ...
    • Probing the dark universe with gravitational lensing 

      Karami, Mansour (University of Waterloo, 2018-09-17)
      Since its early success as an experimental test of the theory of general relativity in 1919, gravitational lensing has come a long way and is firmly established as an indispensable element for many astrophysical applications. ...
    • Probing the large-scale clustering of fast radio bursts with CHIME/FRB 

      Rafiei-Ravandi, Masoud (University of Waterloo, 2021-08-23)
      Explaining the nature of extragalactic fast radio bursts (FRBs) has puzzled astrophysicists since 2007. In this thesis, we introduce the CHIME/FRB instrument, an FRB search engine that could solve this puzzle through FRB ...
    • Selected topics in Computational Relativity 

      Mukherjee, Soham (University of Waterloo, 2022-08-18)
      This thesis addresses a collection of topics that are either directly related to, or have implications for, current challenges in computational relativity. In the first part, we explore a spacetime discretization method ...
    • Semi-Analytic Radiatively Inefficient Accretion Flows in General Gravity 

      Georgiev, Boris (University of Waterloo, 2018-01-05)
      The Event Horizon Telescope is capable of observing black holes on event-horizon scales and we can use it to explore deviations from General Relativity. We replicate the results of a previous study using a Newtonian ...
    • Using Black Hole Environments as Laboratories for Testing Accretion and Gravity 

      Georgiev, Boris (University of Waterloo, 2023-08-29)
      With the advent of the Event Horizon Telescope (EHT), we have the ability to observe the lensed emission from hot plasmas near event horizons. It contains entangled information about the turbulent magnetohydrodynamic ...


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