Gravity’s Cosmic Symphony with Kelly Holley-Bockelmann

What It Covers

LISA, NASA and ESA's space-based gravitational wave detector launching in 2035, will detect supermassive black hole collisions and millions of stellar binaries using three spacecraft separated by 2.5 million kilometers in solar orbit.

Key Questions Answered

• •Detection Scale Advantage: LISA's 2.5 million kilometer arm length enables detection of supermassive black hole mergers with signal-to-noise ratios in the thousands, compared to LIGO's four-kilometer arms detecting only stellar-mass black holes at 10-100 solar masses.
• •Continuous Background Signals: Upon activation, LISA will immediately detect approximately 10 million white dwarf, neutron star, and stellar-mass black hole binaries orbiting in the Milky Way on hour-long timescales, creating a persistent gravitational wave background.
• •Precision Measurement Requirements: LISA's two-kilogram gold-platinum test mass cubes must detect relative distance changes of one part in 10^20, requiring correction for solar radiation pressure, charge buildup from solar wind, and gravitational gradients from individual spacecraft components.
• •Solar System Positioning Technology: LISA's laser communication and precision positioning systems will enable GPS-equivalent navigation throughout the solar system, advancing beyond Earth-based GPS limitations for future lunar and Mars missions requiring exact coordinate determination across planetary distances.