Snowmass2021 Cosmic Frontier White Paper: Fundamental Physics and Beyond the Standard Model

Understand

Gravitational wave detectors are formidable tools to explore strong-field gravity, especially black holes and neutron stars.

• These compact objects are extraordinarily efficient at producing electromagnetic and gravitational radiation.
• As such, they are ideal laboratories for fundamental physics and have an immense discovery potential.
• The detection of black hole binaries by third-generation Earth-based detectors, space-based detectors and pulsar timing arrays will provide exquisite tests of general relativity.