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1. Key Science Goals for the Next-Generation Event Horizon Telescope

Author

Michael D. Johnson, Kazunori Akiyama, Lindy Blackburn, Katherine L. Bouman, Avery E. Broderick, Vitor Cardoso, Rob P. Fender, Christian M. Fromm, Peter Galison, José L. Gómez, Daryl Haggard, Matthew L. Lister, Andrei P. Lobanov, Sera Markoff, Ramesh Narayan, Priyamvada Natarajan, Tiffany Nichols, Dominic W. Pesce, Ziri Younsi, Andrew Chael, Koushik Chatterjee, Ryan Chaves, Juliusz Doboszewski, Richard Dodson, Sheperd S. Doeleman, Jamee Elder, Garret Fitzpatrick, Kari Haworth, Janice Houston, Sara Issaoun, Yuri Y. Kovalev, Aviad Levis, Rocco Lico, Alexandru Marcoci, Niels C. M. Martens, Neil M. Nagar, Aaron Oppenheimer, Daniel C. M. Palumbo, Angelo Ricarte, María J. Rioja, Freek Roelofs, Ann C. Thresher, Paul Tiede, Jonathan Weintroub, and Maciek Wielgus

Subjects
black holes, general relativity, interferometry, accretion, relativistic jets, very-long-baseline interferometry, Astronomy, QB1-991
Abstract

The Event Horizon Telescope (EHT) has led to the first images of a supermassive black hole, revealing the central compact objects in the elliptical galaxy M87 and the Milky Way. Proposed upgrades to this array through the next-generation EHT (ngEHT) program would sharply improve the angular resolution, dynamic range, and temporal coverage of the existing EHT observations. These improvements will uniquely enable a wealth of transformative new discoveries related to black hole science, extending from event-horizon-scale studies of strong gravity to studies of explosive transients to the cosmological growth and influence of supermassive black holes. Here, we present the key science goals for the ngEHT and their associated instrument requirements, both of which have been formulated through a multi-year international effort involving hundreds of scientists worldwide.

Published
2023
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2. The Next Generation Event Horizon Telescope Collaboration: History, Philosophy, and Culture

Author

Peter Galison, Juliusz Doboszewski, Jamee Elder, Niels C. M. Martens, Abhay Ashtekar, Jonas Enander, Marie Gueguen, Elizabeth A. Kessler, Roberto Lalli, Martin Lesourd, Alexandru Marcoci, Sebastián Murgueitio Ramírez, Priyamvada Natarajan, James Nguyen, Luis Reyes-Galindo, Sophie Ritson, Mike D. Schneider, Emilie Skulberg, Helene Sorgner, Matthew Stanley, Ann C. Thresher, Jeroen Van Dongen, James Owen Weatherall, Jingyi Wu, and Adrian Wüthrich

Subjects
black holes, ngEHT, robustness, no hair theorems, scientific collaborations, philosophy, Astronomy, QB1-991
Abstract

This white paper outlines the plans of the History Philosophy Culture Working Group of the Next Generation Event Horizon Telescope Collaboration.

Published
2023
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5. Defending stance voluntarism

Author

Jamee Elder

Subjects
Philosophy of mind, 05 social sciences, Irrationality, Metaphysics, 06 humanities and the arts, 0603 philosophy, ethics and religion, 050105 experimental psychology, Epistemology, Philosophy of language, Philosophy, 060302 philosophy, Ontology, 0501 psychology and cognitive sciences, Sociology, Voluntarism (action)
Abstract

In this paper, I argue that stance voluntarism is a coherent and useful view for understanding debates about the ontological commitments warranted by science. To do so, I first engage in a defensive move: I rescue stance voluntarism from what I take to be the most pressing objection to have emerged in recent literature, which I call the ‘irrationality objection’. According to this objection, an agent courts irrationality by simultaneously holding an epistemic stance and believing that stance voluntarism is true. I argue that this objection is based on a misunderstanding of stance voluntarism and the kinds of reasons that agents take themselves to have for their adopted stances. I then make the positive contention that we can expect the idea of stance voluntarism, thus saved, to not only be a defensible, but also a useful framework for understanding ontological disputes within science. I do this by presenting a case study from contemporary cosmology in which it is so. Combining these two claims, I argue that stance voluntarism is a coherent and useful view for understanding some ongoing disputes about ontology within scientific contexts.

Published
2018

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