For stochastic gravitational wave backgrounds containing simultaneous tensor, vector, and scalar modes, the more inclined LISA-TAIJIm network separates polarization components substantially better than LISA-TAIJIp, although Fisher forecasts for power-law spectra are broadly similar.
Gravitational Wave Background Search by Correlating Multiple Triangular Detectors in the mHz Band
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abstract
With the recent strong developments of TianQin and Taiji, we now have an increasing chance to make a correlation analysis in the mHz band by operating them together with LISA. Assuming two LISA-like triangular detectors at general geometrical configurations, we develop a simple formulation to evaluate the network sensitivity to an isotropic gravitational wave background. In our formulation, we fully use the symmetry of data channels within each triangular detector and provide tractable expressions without directly employing cumbersome detector tensors. We concretely evaluate the expected network sensitivities for various potential detector combinations, including the LISA-TianQin pair.
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Alternative LISA-TAIJI networks: polarization separation of the stochastic gravitational wave background
For stochastic gravitational wave backgrounds containing simultaneous tensor, vector, and scalar modes, the more inclined LISA-TAIJIm network separates polarization components substantially better than LISA-TAIJIp, although Fisher forecasts for power-law spectra are broadly similar.