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Tuesday, May 28, 2024
9:00 AM – 5:00 PM

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Bridging Scales in the Black Hole Accretion-Feedback Problem

Workshop Tuesday, May 28, 2024

Accretion on supermassive black holes (SMBHs) is often accompanied by energy and momentum outflow in the form of jets and winds. This feedback can modify the gas conditions in the surrounding galaxy and thus plays an important role in galaxy evolution. At the same time, the gas conditions in the galaxy determine how much gas feeds into the black hole, thereby determining the evolution of mass, spin and feedback efficiency of the SMBH.

The strongly coupled feeding-feedback problem is notoriously difficult to handle self-consistently in numerical studies of galaxy-SMBH evolution because of the enormous range of scales involved, which is typically eight or nine orders of magnitude. Since current numerical techniques are unable to bridge the vast range of scales, the coupling is generally handled via ad hoc sub-grid prescriptions with adjustable parameters tuned to reproduce observations. This Workshop aims to discuss strategies for transitioning toward a more first-principles treatment of the feeding-feedback problem using new techniques to bridge scales.

The Workshop will take place at the Center for Astrophysics, Harvard University, on Tuesday, May 28, 2024. It will bring together a small group of experts and interested scientists who will consider current progress on the Bridging Scales Problem and will discuss avenues for future work. The Workshop Schedule will consist of a small number of talks by relevant experts, each followed by extended time for discussion.


  • Ramesh Narayan
  • Priya Natarajan

Local Organizing Committee

  • Hyerin Cho
  • Nicole Grenier
  • Kung-Yi Su

Current List of Participants

  • Daniel Angles-Alcazar
  • Olga Borodina
  • Koushik Chatterjee
  • Tiziana Di Matteo
  • Lars Hernquist
  • Phil Hopkins
  • Minghao Guo
  • Aretaios Lalakos
  • Matthew Liska
  • Ben Prather
  • Sean Ressler
  • Angelo Ricarte
  • Rachel Somerville
  • Sasha Tchekhovskoy
  • Rachel Somerville
  • Sasha Tchekhovskoy


The Center for Astrophysics is located at 60 Garden Street, Cambridge. Convenient hotels include: The Sheraton Commander Hotel, the Porter Square Hotel, the DoubleTree Suites Boston-Cambridge, and the Homewood Suites by Hilton. Participants are urged to book early as the meeting is soon after Harvard Commencement, so hotel rooms are likely to be in demand.

BHI Publication

Expanding Sgr A* dynamical imaging capabilities with an African extension to the Event Horizon Telescope

April 1, 2023
Kantzas, D.; Markoff, S.; Lucchini, M.; Ceccobello, C.; Chatterjee, K.
Astrophysical jets are relativistic outflows that remain collimated for remarkably many orders of magnitude. Despite decades of research, the…
Read The BHI Publication