Snowmass2021 Cosmic Frontier White Paper: Future Gravitational-Wave Detector Facilities

Kavli Affiliate: Peter Fritschel

| First 5 Authors: Stefan W. Ballmer, Rana Adhikari, Leonardo Badurina, Duncan A. Brown, Swapan Chattopadhyay

| Summary:

The next generation of gravitational-wave observatories can explore a wide
range of fundamental physics phenomena throughout the history of the universe.
These phenomena include access to the universe’s binary black hole population
throughout cosmic time, to the universe’s expansion history independent of the
cosmic distance ladders, to stochastic gravitational-waves from early-universe
phase transitions, to warped space-time in the strong-field and high-velocity
limit, to the equation of state of nuclear matter at neutron star and
post-merger densities, and to dark matter candidates through their interaction
in extreme astrophysical environments or their interaction with the detector
itself. We present the gravitational-wave detector concepts than can drive the
future of gravitational-wave astrophysics. We summarize the status of the
necessary technology, and the research needed to be able to build these
observatories in the 2030s.

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