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AMIGO is a first-generation Astrodynamical Middle-frequency Interferometric GW Observatory. The scientific goals of AMIGO are: to bridge the spectra gap between first-generation high-frequency and low-frequency GW sensitivities; detecting intermediate mass BH coalescence; detecting inspiral phase and predict time of binary black hole coalescence together with neutron star coalescence for ground interferometers; detecting compact binary inspirals for studying stellar evolution and galactic population. The mission concept is to use time delay interferometry for a nearly triangular formation of 3 drag-free spacecraft with nominal arm length 10,000 km, emitting laser power 2-10 W and telescope diameter 300-360 mm. The design GW sensitivity in the middle frequency band is 3 × 10−21 Hz-1. Four options of orbits are under study: (i) Earth-like solar orbits (3-20 degrees behind the Earth); (ii) 600,000 km high orbit formation around the Earth; (iii) 100,000 km-250,000 high orbit formation around the Earth; (iv) near Earth-Moon L4 (or L5) halo orbit formation. All four options have LISA-like formations, that is the triangular formation is 60º inclined to the orbit plane.

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In 1918, Lense and Thirring discovered in general relativity the gravitomagnetic effect on the Moon’s orbit around Earth in the gravitational field of the rotating Sun. This Lense-Thirring frame dragging effect is important in the understanding of astrophysical phenomena. It is also important in finding the matched templates for detecting gravitational waves. Lense-Thirring precession of the orbits of LAGEOS satellites was experimentally verified. The frame-dragging on the quartz gyros on board the Gravity Probe B drag-free satellite is successfully measured. With the development of laser interferometry and atom interferometry, the precision of laser ring gyros and atom gyros improves quickly. A number of large-scale earth-based ring gyros with the aim for geophysical applications, and for measuring the Lense-Thirring effects are under development. Large-scale atom gyros have also been seriously proposed. Year 2018 marks the centennial of Lense-Thirring effects. We take the opportunity to celebrate this occasion by organizing an international workshop on Lense-Thirring frame dragging and large-scale rotation sensing and related topics. The topics for this workshop include: - Gravitomagnetism - Lense-Thirring effects in the solar system, in astrophysics and in cosmology; - Large-scale laser ring gyros; - Precision atom gyros and large-scale proposals; - Space rotation sensors; - Application to geophysics together with interferometric strain meters; - Precision area metrology and geometrical stability; - Other related topics

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With the detection of high-frequency GWs from the coalescence of stellar-size black holes and neutron stars, we are formally ushered into the age of gravitational-wave astronomy. LISA Pathfinder (LPF) launched on 3 December 2015 has completely met the stringent LISA drag-free demand and has successfully paves the road for space detection of low frequency (0.1 Hz to 0.1 Hz) GWs and middle-frequency (0.1 Hz to 10 Hz) GWs. Talks will be focused on recent activities both for Earth-based and space borne detection of middle-frequency GWs: GW sources, Newtonian Noise Cancellation, TOBA (Torsion Bar Antenna), MIGA (Matter-wave laser Interferometric Gravitation Antenna), AIGSO (Atomic Interferometric Gravitational-wave Space Observatory), MAGIS (Mid-band Atomic Gravitational Wave Interferometric Sensor), AMIGO (Astrodynamical Middle-Frequency Interferometric Gravitational-wave Observatory), SOGRO (Superconducting Omni-directioanl Gravitational Radiation Observatory), etc. This talk is an overview of this session.

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