MG15 - Talk detail

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We propose a space-borne gravitational-wave detection scheme, called atom interferometric gravitational-wave space observatory (AIGSO). It is motivated by the progress in the atomic matter-wave interferometry, which solely utilizes the standing light waves to split, deflect and recombine the atomic beam. Our scheme consists of three drag-free satellites orbiting the Earth. The phase shift of AIGSO is dominated by the Sagnac effect of gravitational-waves, which is proportional to the area enclosed by the atom interferometer, the frequency and amplitude of gravitational-waves. The scheme has a strain sensitivity 10^{-20}/\sqrt{Hz} in the 100 mHz-10 Hz frequency range, which fills in the detection gap between space-based and ground-based laser interferometric detectors. Thus, our proposed AIGSO can be a good complementary detection scheme to the space-borne laser interferometric schemes, such as LISA. Considering the current status of relevant technology readiness, we expect our AIGSO to be a promising candidate for the future space-based gravitational-wave detection plan.

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An underground gravitational-wave detection scheme, based on laser-linked atom interferometers, was proposed. We call it ZAIGA (Zhaoshan long-baseline atom interferometer gravitation antenna). The ZAIGA will be located at 200 meters averagely below the ground surface of Mountain Zhao, which is about 80 km southeast to Wuhan city. It will take an equilateral triangle configure, with two 3km-apart atom interferometers in each arm. The scheme will have a strain sensitivity < 10^{-20}/Hz^{1/2} in the middle frequency range (100 mHz-10 Hz). Thus, our proposed ZAIGA can fill in the detection gap between the ground-based GW detectors (such as LIGO, VIRGO and KAGRA) and the future space-based GW detectors (such as LISA).

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