"Worldline Instantons and Pair Production"Qinghai Wang , Unversity of Connecticut [Host: Paul Fendley]
ABSTRACT:
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.

High Energy Physics Seminar Wednesday, October 25, 2006 3:30 PM Physics Building, Room 204 Note special room. 
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