3 papers
physics.app-ph2026
Acoustic Analogy of Quantum Baldin Sum Rule for Optimal Causal Scattering
Sichao Qu, Zixiong Yu, Erqian Dong +2
The mass law is a cornerstone in predicting sound transmission loss, yet it neglects the constraints of causal dispersion. Current causality-based theories, such as the Rozanov lim…
physics.app-ph2025
Generalized causality constraint based on duality symmetry reveals untapped potential of sound absorption
Sichao Qu, Min Yang, Sibo Huang +6
Causality constraints are known to bind sound absorption to a limit that can only be achieved by optimizing the system bandwidth for a specific material thickness. This limit is de…
cond-mat.mtrl-sci2024
Acoustic Blackbody Absorption: Transcending Causality Limits through Instability-Induced Softness
Min Yang, Sichao Qu, Nicholas Fang +1
By coupling unstable components, we demonstrate a novel approach that reduces static modulus to zero, eliminating causality-imposed absorption limitations in acoustics. Our heurist…