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A conceptual framework for describing physical quantities that can take on negative values in meaningful ways, beyond just mathematical convenience. Negative energy densities (predicted by quantum field theory), negative temperatures (achieved in laser systems), negative pressure (driving cosmic inflation), and negative mass (hypothetical) all fall under negative physics. It's the study of the physical regimes where our intuitive sense that "more" means "bigger positive number" breaks down, and the universe reveals stranger possibilities.
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