2025/06/03 by Jun-Shuai Wang, Wang, Jun-Shuai, Chang Liu +5 · 1 citation
Engineering · Physics and Astronomy · #Advanced Frequency and Time Standards #Astronomical Observations and Instrumentation #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Astrophysical Phenomena (astro-ph.HE) #Pulsars and Gravitational Waves Research
paper · pdf · doi:10.48550/arxiv.2506.02909
openalex publication_date 2025/06/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this work, we systematically investigate the capability of space-based gravitational wave detectors in constraining parameters of non-tensor polarization modes. Using Bayesian inference and Fisher Information Matrix methods, we analyze gravitational wave signals from the inspiral phase of supermassive binary black hole mergers. By starting with time-domain signals and applying Fourier transforms, we avoid the use of the stationary phase approximation. We found an asymmetry in the estimation of the vector-mode parameter αx at inclination angles ι= 0 and ι= π, which has not been explicitly pointed out in previous studies. We also observe strong correlations between scalar-mode parameters, αb and αl, which currently limit their independent estimation. These findings underscore the importance of using complete inspiral-merger-ringdown waveforms to enhance the ability to distinguish the non-tensor polarization modes. Finally, we employ a new LISA-Taiji network configuration, in which the orientation of spacecrafts of Taiji maintains a fixed phase offset relative to these of LISA. Under the adiabatic approximation and the assumption of equal arms, this phase is found to have no significant effect on data analysis.