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Schwinger-Keldysh formalism II: Thermal equivariant cohomology
Felix M. Haehl, R. Loganayagam, Mukund Rangamani
Causally ordered correlation functions of local operators in near-thermal quantum systems computed using the Schwinger-Keldysh formalism obey a set of Ward identities. These can be…
Schwinger-Keldysh formalism I: BRST symmetries and superspace
Felix M. Haehl, R. Loganayagam, Mukund Rangamani
We review the Schwinger-Keldysh, or in-in, formalism for studying quantum dynamics of systems out-of-equilibrium. The main motivation is to rephrase well known facts in the subject…
Holographic Entanglement Entropy
Mukund Rangamani, Tadashi Takayanagi
We review the developments in the past decade on holographic entanglement entropy, a subject that has garnered much attention owing to its potential to teach us about the emergence…
Deriving covariant holographic entanglement
Xi Dong, Aitor Lewkowycz, Mukund Rangamani
We provide a gravitational argument in favour of the covariant holographic entanglement entropy proposal. In general time-dependent states, the proposal asserts that the entangleme…