  The toolbox to study the Universe grew on 14 September 2015 when the
LIGO-Virgo collaboration heard a signal from two colliding black holes between
30-250 Hz. Since then, many more gravitational waves have been detected as
detectors increased sensitivity. However, the current detector design
sensitivity curves still have a lower cut-off of 10 Hz. To detect even
lower-frequency gravitational-wave signals, the Lunar Gravitational-wave
Antenna will use an array of seismic stations in a permanently shadowed crater.
It aims to detect the differential between the elastic response of the Moon and
the suspended inertial sensor proof mass motion induced by gravitational waves.
A cryogenic superconducting inertial sensor is under development that aims for
fm/rtHz sensitivity or better down to 1 Hz and is planned to be deployed in
seismic stations. Here, we describe the current state of research towards the
inertial sensor, its applications and additional auxiliary technologies in the
payload of the lunar gravitational-wave detection mission.
