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Schwinger-Keldysh superspace in quantum mechanics
Michael Geracie, Felix M. Haehl, R. Loganayagam +3
We examine, in a quantum mechanical setting, the Hilbert space representation of the BRST symmetry associated with Schwinger-Keldysh path integrals. This structure had been postula…
Thermal out-of-time-order correlators, KMS relations, and spectral functions
Felix M. Haehl, R. Loganayagam, Prithvi Narayan +2
We describe general features of thermal correlation functions in quantum systems, with specific focus on the fluctuation-dissipation type relations implied by the KMS condition. Th…
Two roads to hydrodynamic effective actions: a comparison
Felix M. Haehl, R. Loganayagam, Mukund Rangamani
We make a detailed comparison between two attempts in recent years to construct hydrodynamic effective actions: we compare our work [1-7] with that of Crossley-Glorioso-Liu [8] and…
Towards a second law for Lovelock theories
Sayantani Bhattacharyya, Felix M. Haehl, Nilay Kundu +2
In classical general relativity described by Einstein-Hilbert gravity, black holes behave as thermodynamic objects. In particular, the laws of black hole mechanics can be interpret…
Classification of out-of-time-order correlators
Felix M. Haehl, R. Loganayagam, Prithvi Narayan +1
The space of n-point correlation functions, for all possible time-orderings of operators, can be computed by a non-trivial path integral contour, which depends on how many time-ord…