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arXiv · 2608.11852

Taiji Resolving Power for the Transverse Scalar Mode of Gravitational Waves

Bo-Xuan Ge·Zhoujian Cao
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Abstract

We investigate how small a co-propagating transverse-scalar component can be resolved by Taiji in an already identified bright tensor chirp. Using a source-tracked tensor-null response, we formulate the problem in terms of the minimum resolvable scalar strain fraction and evaluate it over the sky. For a one-year benchmark chirp with tensor signal-to-noise ratio $\rho_T=1000$, we find that Taiji can rule out transverse-scalar strain fractions $\epsilon_b\gtrsim0.532\%$ at the all-sky median level. The threshold scales as $\epsilon_{b,\min}\propto\rho_T^{-1}$, so brighter tensor events can probe correspondingly smaller scalar fractions. We further find that this sub-percent resolving power remains predictable under small source-parameter mismatches through the associated tensor-leakage structure.

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Bo-Xuan Ge, Zhoujian Cao. 2026-08-12. Taiji Resolving Power for the Transverse Scalar Mode of Gravitational Waves. https://arxiv.org/abs/2608.11852

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