Observing gravitational wave polarizations with LISA-TAIJI network

Abstract

Two polarization modes of gravitational wave are derived from the general relativity which are plus and cross modes. However, the alternative theories of gravity can yield the gravitational wave with up to six polarizations. Searching for the polarizations beyond plus and cross is an important test of general relativity. In principle, one space-borne detector, like LISA, could measure the gravitational wave polarizations from a long time observation with its orbital motion. With the comparable sensitivities, the joint LISA and TAIJI missions will improve the observations on the polarization predictions of theories beyond general relativity. In this work, a class of parameterized post-Einsteinian waveform is employed to describe the alternative polarizations, and six parameterized post-Einsteinian parameters quantifying from general relativity waveform are examined by using the LISA-TAIJI network. Our results show that the measurements on amplitudes of alternative polarizations from joint LISA-TAIJI observation could be improved by more than 10 times compared to LISA single mission in an optimal scenario.

16 pages, 9 figures, accepted for publication in PRD

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Cited by in corpus (4)

• Concepts and status of Chinese space gravitational wave detection projects
• Tracing Astrophysical Black Hole Seeds and Primordial Black Holes with LISA-Taiji Network
• Alternative LISA-TAIJI networks: detectability of the isotropic stochastic gravitational wave background
• Correlation analysis for isotropic stochastic gravitational wave backgrounds with maximally allowed polarization degrees