2024/10/13 by H. Xu, Xu, Hao, Dong-Yu Hong +5 · 7 citations
Computer Science · Engineering · Physics and Astronomy · #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #High Energy Physics - Theory (hep-th) #Low-power high-performance VLSI design #Numerical Methods and Algorithms #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2410.09794
openalex publication_date 2024/10/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Using dispersion relations of the scattering amplitudes and semi-definite programming, we calculate causality bounds on the Wilson coefficients in scalar-tensor effective field theories that include parity-violating operators. Particular attention has been paid to the dynamical-Chern-Simons (dCS) and scalar-Gauss-Bonnet (sGB) couplings, along with higher order coefficients, and the interplay between them. For the leading terms, the bounds on the parity-conserving and -violating coefficients are simply projections of the complex coefficients. Some parity-violating coefficients are found to be upper bounded by the parity-conserving counterparts, or the higher order parity-conserving coefficients. While the observational constraints on parity-violating coefficients are weaker than the parity-conserving counterparts, the causality bounds are of comparable strength and thus may play a more prominent role in constraining strong gravity effects in upcoming observations.