Speaker
Prof.
Koji Hashimoto
(Osaka university / RIKEN)
Description
We analyze vacuum instability of strongly coupled gauge theories in a constant
electric field using AdS/CFT correspondence. The model is the N = 2 1-flavor
supersymmetric large Nc QCD in the strong ’t Hooft coupling limit. We calculate the
Euler-Heisenberg effective Lagrangian L(E), which encodes the nonlinear response
and the quantum decay rate of the vacuum in a background electric field E, from
the complex D-brane action in AdS/CFT. We find that the decay rate given by
ImL(E) becomes nonzero above a critical electric field set by the confining force
between quarks. A large E expansion of Im L(E) is found to coincide with that
of the Schwinger effects in QED, replacing its electron mass by the confining force.
Primary author
Prof.
Koji Hashimoto
(Osaka university / RIKEN)
