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hep-th2009★ 8 cited
Convexity of effective Lagrangian in nonlinear electrodynamics as derived from causality
Anatoly E. Shabad, Vladimir V. Usov
In nonlinear electrodynamics, by implementing the causality principle as the requirement that the group velocity of elementary excitations over a background field should not exceed…
hep-th2005
N=2 Strings on Orbifolds
Dan Gluck, Yaron Oz, Tadakatsu Sakai
We study closed N=2 strings on orbifolds of the form T^4/Z_2 and C^2/Z_2. We compute the torus partition function and prove its modular invariance. We analyse the BRST cohomology o…