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New Geometric Transition as Origin of Particle Production in Time-Dependent Backgrounds
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New Geometric Transition as Origin of Particle Production in Time-Dependent Backgrounds
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By extending the quantum evolution of a scalar field in time-dependent backgrounds to the complex-time plane and transporting the in-vacuum along a closed path, we argue that the geometric transition from the simple pole at infinity determines the multi-pair production depending on the winding number. We apply the geometric transition to Schwinger mechanism in the time-dependent vector potential for a constant electric field and to Gibbons-Hawking particle production in the planar coordinates of a de Sitter space.
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