Equivalent geometric transformations in optical lattice clock networks preserve the modulus of the overlap reduction function, enabling a four-spacecraft orbital configuration whose strain sensitivity is evaluated against LISA, Taiji, and TianQin.
Space missions to detect the cosmic gravitational-wave background
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abstract
It is thought that a stochastic background of gravitational waves was produced during the formation of the universe. A great deal could be learned by measuring this Cosmic Gravitational-wave Background (CGB), but detecting the CGB presents a significant technological challenge. The signal strength is expected to be extremely weak, and there will be competition from unresolved astrophysical foregrounds such as white dwarf binaries. Our goal is to identify the most promising approach to detect the CGB. We study the sensitivities that can be reached using both individual, and cross-correlated pairs of space based interferometers. Our main result is a general, coordinate free formalism for calculating the detector response that applies to arbitrary detector configurations. We use this general formalism to identify some promising designs for a GrAvitational Background Interferometer (GABI) mission. Our conclusion is that detecting the CGB is not out of reach.
fields
gr-qc 1years
2026 1verdicts
UNVERDICTED 1representative citing papers
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Detecting gravitational wave background with equivalent configurations in the network of space based optical lattice clocks
Equivalent geometric transformations in optical lattice clock networks preserve the modulus of the overlap reduction function, enabling a four-spacecraft orbital configuration whose strain sensitivity is evaluated against LISA, Taiji, and TianQin.