Looking for gravitational waves with orbital dynamics: GUEST mission and the $μ$Hz band of Gravitational Waves
Year: 2026
Type: preprint
Abstract: `Adding colour'' to the gravitational-wave sky by probing unexplored frequency bands has the potential to unveil new and unexpected phenomena in the Universe. The microhertz band, between pulsar timing arrays and LISA, is a particularly attractive target: it should host the extension of the signal recently found by pulsar timing arrays (if it is generated by a family of sources of gravitational waves), and it may harbour signals from the early Universe, primordial black holes or dark matter. In these proceedings, we review how the orbits of gravitationally bound systems act as resonant detectors of microhertz gravitational waves and ultra-light dark matter. We then describe GUEST (Gravitational Universe Exploration with Satellite Tracking), a mission concept recently proposed to the ESA F-class call, consisting of two dense passive spheres covered with retroreflectors, placed in highly eccentric Earth orbits and tracked by a global laser-ranging network.
Source: arXiv (Cornell University)
Author: Blas, Diego
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1401168639, G1855990336, G2064873908, G2309174360, G2341298403, G2462415295, G252646220, G2660406951, Unravelling the Dark Universe from the Canary Islands Observatories, G3005324705, G3427743928, G3518538256, G3546882995, G410571670, G4228227490, G430777504, G451917667, G4744355279, G4762216095, G5110141902, G5195188938, G523076202, G5421974903, G5539308778, G5967599077, G6033112984, G6603587382, G6656126374, G745419941, G787121397, G7981279683, G8522095481, G8575141037, G99296377
OpenAlex ID: W7224823397