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We describe in detail a physical situation in which instantons are necessarily complex, not just Wick rotations of classical solutions to Euclidean spacetime.
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C. Schubert, “Perturbative quantum field theory in the string inspired formalism,” Phys. Rept. 355
2001
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T. Sharpee, M. I. Dykman, and P. M. Platzman, “Tunneling decay in a magnetic field”, Phys. Rev. A 65
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L. D. Landau and L. M. Lifshitz, Quantum Mechanics (Nonrelativistic Theory)
2003
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H. Kleinert, Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets
2004
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V. A. Fock, “Proper time in classical and quantum mechanics”, Izv. Akad. Nauk 4-5
2004
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H. Gies, K. Langfeld, “Loops and loop clouds: A Numerical approach to the worldline formalism in QED,” Int. J. Mod. Phys. A17
2005
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2009
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2010
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2010
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2010
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C. K. Dumlu, “Schwinger Vacuum Pair Production in Chirped Laser Pulses,” Phys. Rev. D82
2010
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2011
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2011
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2011
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