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The study of the vacuum state in the context of quantum field theory in curved spacetime. It investigates how the definition of "empty space" and its associated energy (zero-point energy) changes for observers in different gravitational fields or states of acceleration. This leads to phenomena like Hawking radiation (where a black hole's event horizon creates a thermal vacuum) and the Unruh effect (an accelerating observer detects a warm vacuum). It's the weird intersection where quantum nothingness meets relativistic gravity.
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