Gravitational Wave Detection with Relative Astrometry using Roman's Galactic Bulge Time Domain Survey

Understand

Gravitational waves (GWs) are a new avenue of observing our Universe.

• So far, we have seen them in the ~10-100 Hz range, and there are hints that we might soon detect them in the nanohertz regime.
• Multiple efforts are underway to access GWs across the frequency spectrum; however, parts of the frequency space are currently not covered by any planned or future observatories.
• Photometric surveys can bridge the microhertz gap in the spectrum between LISA and Pulsar Timing Arrays (PTAs) through relative astrometric measurements.