Thermodynamic Signatures and Information-Theoretic Constraints in SETI: A Multi-Messenger Approach

With the deep exploration of exoplanet atmospheres by the James Webb Space Telescope (JWST) and the discovery of anomalous physical properties of interstellar meteors (such as IM1), the Search for Extraterrestrial Intelligence (SETI) is
undergoing a paradigm shift from radio detection to the identification of multimodal technosignatures. This paper proposes a comprehensive detection framework integrating thermodynamics, astrophysics, and information theory.