Astronomy

2020 May 19

BHI Colloquium

1:30pm to 2:30pm

Location: 

BHI Meeting Room

Attention: all talks will be given via Zoom until further notice.
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link to connect with us.

Netta Engelhardt (MIT)

Title: The Information Paradox in the Age of Holographic Entanglement Entropy

Abstract: The black hole information paradox —...

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2020 May 05

BHI Colloquium

1:30pm to 2:30pm

Location: 

BHI Meeting Room

Attention: all talks will be given via Zoom until further notice.
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link to connect with us.

Mohammadtaher Safarzadeh (UCSC)

Title: Probing the binary black holes merger rate history with stochastic gravitational wave background searches

Abstract: What...

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2020 Apr 28

BHI Colloquium

1:30pm to 2:30pm

Location: 

BHI Meeting Room

Attention: all talks will be given via Zoom until further notice.
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link to connect with us.

Piotr Chrusciel (University of Wien)

Title: Mass, and its positivity?, for solutions of Einstein equations with negative cosmological constant.

Abstract: I will review the notion of mass...

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2020 Apr 14

BHI Colloquium

1:30pm to 2:30pm

Location: 

BHI Meeting Room

Attention: all talks will be given via Zoom until further notice.
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link to connect with us.

Kevin Nguyen (BHI and Harvard University)

Title: Dynamical damping of the cosmological constant: a proof of concept
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2020 Mar 10

BHI Colloquium

1:30pm to 2:30pm

Location: 

BHI Meeting Room

Mina Himwich (BHI)

 Title: Universal Polarization of the Photon Ring

Abstract: Black hole images are dominated by a photon ring with universal features that are completely governed by general relativity. In this talk, I will discuss how the polarimetric image of a black hole also displays universal properties. In particular, the photon ring exhibits a self-similar pattern of polarization that encodes the black hole spin. The corresponding polarimetric signatures  on long interferometric...

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2020 Mar 03

BHI Colloquium

1:30pm to 2:30pm

Location: 

BHI Meeting Room

Mu-Tao Wang (Columbia University)

Title: On an invariant notion of angular momentum at null infinity

Abstract: We extend the earlier work of Chen-Wang-Yau and Keller-Wang-Yau to define total angular momentum of an asymptotically flat null hypersurface. This induces an angular momentum definition at any section of null infinity. We prove that this definition satisfies several invariant properties that include the BMS invariance.

 

Jose L....

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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 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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Selma de Mink

Selma de Mink

Faculty Affiliate, Black Hole Initiative
Associate Professor in Astrophysics, Harvard University

Selma de Mink is a Dutch astrophycisist. She is a Professor of Astrophysics at the Astronomy department and Institute for Theory and Computation at...

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2019 Apr 09

Yakov Shlapentokh-Rothman: Princeton University & Roberto Emperan: Universitat de Barcelona

1:00pm to 3:00pm

Location: 

BHI conference Room: 20 Garden Street, Cambridge (Lunch will be served at 1:00 pm)

Yakov Shlapentokh-Rothman: Princeton University

Title: Superradiant Instabilities for Massive Scalar Fields on Kerr Black Hole Backgrounds

Abstract: Superradiance refers to the possibility of energy extraction from a rotating black. We will discuss how this phenomenon leads to instabilities in the propagation of massive...

Read more about Yakov Shlapentokh-Rothman: Princeton University & Roberto Emperan: Universitat de Barcelona

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