Testing Cosmic Distance Duality with Space-Based Gravitational Wave Detectors

This study investigates the potential of using strongly lensed gravitational wave (SLGW) signals from massive binary black holes (MBBH) to test the cosmic distance duality relation (CDDR). The researchers simulated 90 days of SLGW data for 10 events, considering the strong lensing scenario that produces two images. They then performed parameter estimation within a Bayesian statistical framework, combining simulated data from both Taiji and LISA. The results show that joint Taiji+LISA analysis improves the measurement precision of the CDDR deviation parameter η0 by roughly a factor of two compared with Taiji-only observations. The inferred values of η0 remain consistent with η0 = 0 within the estimated uncertainties, with no statistically significant evidence for deviations from the CDDR at the achieved precision. This research demonstrates the significant advantage of joint space-based observations for high-precision tests of the CDDR. The study contributes to the ongoing efforts to validate cosmological models and probe the fundamental laws of physics. The use of simulated data allows for a controlled environment to test the capabilities of future gravitational wave detectors. However, it is important to note that the analysis relies on specific lens models and assumptions about the properties of MBBHs. Future research should focus on incorporating more realistic models and addressing potential systematic uncertainties. The study highlights the importance of international collaboration in advancing space-based gravitational wave astronomy. The combined efforts of Taiji and LISA will provide unprecedented opportunities to explore the universe and test the limits of our knowledge.

_Context: This intelligence report was compiled by the DailyOrbitalWire Strategy Engine. Verified for Art. 50 Compliance._