Boundary conditions and unitarity: the Maxwell-Chern-Simons system in AdS3/CFT2

Journal of High Energy Physics - 2012
Tomás Andrade1, Juan I. Jottar2, Robert G. Leigh2
1Department of Physics, UCSB, Santa Barbara, CA, 93106, U.S.A.
2Department of Physics, University of Illinois, 1110 W. Green Street, Urbana, IL, 61801, U.S.A.

Tóm tắt

Abstract We consider the holography of the Abelian Maxwell-Chern-Simons (MCS) system in Lorentzian three-dimensional asymptotically-AdS spacetimes, and discuss a broad class of boundary conditions consistent with conservation of the symplectic structure. As is well-known, the MCS theory contains a massive sector dual to a vector operator in the boundary theory, and a topological sector consisting of flat connections dual to U(1) chiral currents; the boundary conditions we examine include double-trace deformations in these two sectors, as well as a class of boundary conditions that mix the vector operators with the chiral currents. We carefully study the symplectic product of bulk modes and show that almost all such boundary conditions induce instabilities and/or ghost excitations, consistent with violations of unitarity bounds in the dual theory.

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