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Past Events

  • 2020 Feb 25

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room

    Gaurav Khanna (UMass Dartmouth)

    Title: Observational signatures of near-extremal Kerr black holes

    Abstract: In this talk I will present some of my recent work on potential observational signatures of near-extremal and extremal Kerr black holes. The emphasis of this work is on the late-stages of the gravitational wave signal (quasi-normal phase and later) from such black holes, and is of relevance to current and future generation gravitational wave observatories like LIGO/Virgo and LISA. These results are...

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  • 2020 Feb 11

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room

    Peter Hintz (MIT)

    Title: Recent developments in Strong Cosmic Censorship

    Abstract: Penrose's Strong Cosmic Censorship (SCC) conjecture is a statement about the uniqueness of solutions of Einstein's field equations. It predicts that spacetimes generically become singular at Cauchy horizons. Such horizons exist deep inside of many black hole spacetimes, including Kerr and Reissner--Nordström spacetimes, and are expected to exist also for dynamical black holes. A failure of SCC would permit an...

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  • 2020 Feb 04

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room

    Georgios Moschidis (UC Berkeley)

    Title: The instability of Anti-de Sitter spacetime: Recent progress

    Abstract: According to the AdS instability conjecture, there exist arbitrarily small perturbations to the initial data of AdS spacetime which, under evolution by the vacuum Einstein equations with reflecting  boundary conditions on conformal infinity, lead to the formation of black holes after sufficiently long time. To this day, the question about the vacuum equations remains open (and poorly...

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  • 2020 Jan 28

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room

    Oliver Porth (University of Amsterdam)

    Title: Dynamics of black hole accretion. Of flux-tubes, plasmoids and transient phenomena

    Abstract: Over the last two decades, general relativistic magnetohydrodynamic simulations (GRMHD) have drawn a robust broad-brush picture of black hole accretion and jet formation in low-luminosity sources.  The observations by the Event Horizon Telescope and the GRAVITY interferometer now probe accretion physics with unprecedented detail requiring equally sophisticated...

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  • 2019 Dec 17

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room

    Marek Abramowicz (Copernicus Center, Warsaw)

    Title: TBD

    Abstract: TBD

    Bhupendra Mishra (JILA, Boulder)

    Title: TBD

    Abstract: TBD

    Debora Lancova (Opava University)

    Title: TBD

    Abstract: TBD

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  • 2019 Dec 10

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room
    The new BHI Fellows will derived a short presentation about their work. Speakers will be: Martin Lesourd (Mathematics/Philosophy), Kevin Nguyen (Physics), Achilleas Porfyriadis (Physics) and Max Zimet (Mathematics/Physics).
  • 2019 Dec 03

    BHI Colloquium

    1:30pm

    Location: 

    BHI Meeting Room

    Xiaohui Fan (University of Arizona)

    Title: The First Luminous Quasars

    Abstract: I will describe the ongoing surveys to discover luminous quasars at the highest redshift. These surveys allow the first measurements of quasar luminosity function at the epoch of reionization, and predict the redshift at which we will find the earliest luminous quasars powered by billion solar mass black holes in the observable universe. I will also update the effort to measure black hole mass function in quasars at the...

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  • 2019 Nov 26

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room

    Wlodek Kluzniak (University of Warsaw)

    Title: Diskoseismic modes in radiative general-relativistic hydrodynamical simulations of thin disks

    Abstract: High frequency quasiperiodic variability in accreting black hole sources is thought to reflect the underlying space-time metric. A detailed analytic theory of normal modes of thin disks has been worked out and can be found in books (e.g., Kato 2016) and review papers (e.g., Wagoner 2008). Other mechanisms, such as resonance resulting in a 3:2 ratio of...

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  • 2019 Nov 19

    BHI Colloquium

    1:30pm to 2:30pm

    Location: 

    BHI Meeting Room

    Andreas Bauswein (University of Heidelberg)

    Title: The QCD phase transition in neutron star mergers

    Abstract: At low temperature quantum chromodynamics predicts a transition from ordinary hadronic matter to de-confined quark matter at higher densities. Whether or not this transition occurs at densities which are realized in neutron stars is currently unclear. We discuss an unambiguous signature of this phase transition in neutron star mergers. This idea is based on a comparison between information from the...

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