Next Generation Observatories — Report from the Dawn VI Workshop; October 5-7 2021

Kavli Affiliate: Rainer Weiss

| First 5 Authors: D. H. Shoemaker, Stefan Ballmer, Matteo Barsuglia, E. Berger, Emanuele Berti

| Summary:

The workshop Dawn VI: Next Generation Observatories took place online over
three days, 5-7 October, 2021. More than 200 physicists and astronomers
attended to contribute to, and learn from, a discussion of next-generation
ground-based gravitational-wave detectors. The program was centered on the next
generation of ground-based gravitational-wave observatories and their synergy
with the greater landscape of scientific observatories of the 2030s. Cosmic
Explorer (CE), a concept developed with US National Science Foundation support,
was a particular focus; Einstein Telescope (ET), the European next generation
concept, is an important complement and partner in forming a network. The
concluding summary of the meeting expressed the sentiment that the
observational science accessible to CE and ET, also in combination with data
from other non-GW observatories, will stimulate a very broad community of
analysts and yield insights which are exciting given the access to GWs from the
entire universe. The need, and desire, for closer collaboration between ET and
CE was expressed; a three-detector network is optimal for delivering much of
the science. The science opportunities afforded by CE and ET are broad and
compelling, impacting a wide range of disciplines in physics and high energy
astrophysics. There was a consensus that CE is a concept that can deliver the
promised science. A strong endorsement of Cosmic Explorer, as described in the
CE Horizon Study, is a primary outcome of DAWN VI.

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