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A theoretical framework extending classical thermodynamics to account for scenarios where energy and mass are not conserved—[particularly] in contexts of cosmic expansion, gravitational collapse, and far‑from‑equilibrium systems. It argues that in expanding spacetimes (like our universe), energy is not globally conserved because time‑translation symmetry breaks. In contracting systems (like matter falling into a black hole), mass‑energy can appear to increase or decrease depending on the frame of reference. This framework also applies to open biological and social systems that exchange energy with their [environment], where “conservation” is local and temporary. Contraction and expansion thermodynamics challenges the [absolutism] of conservation laws, showing they are context‑dependent.
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