High Energy Physics Seminars

ics High Energy
Wednesday, October 25, 2006
3:30 PM
Physics Building, Room 204
Qinghai Wang [Host: Paul Fendley]
Unversity of Connecticut
"Worldline Instantons and Pair Production"
The imaginary part of the QED effective action can be approximated by the contribution of a worldline instanton, a solution to the classical Euclidean worldline equations of motion. In this talk, I will briefly review this formalism and compute also the prefactor arising from quantum fluctuations about this classical path. I will show the excellent agreement between our semiclassical approximation, conventional WKB, and numerical results using numerical worldline loops. I will also show the extension of the worldline instanton technique to multidimensional spatially inhomogeneous electric background fields, for which, WKB failed to apply.

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