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Probing out-of-time-order correlators

par Chaudhuri, Soumyadeep ;Loganayagam, R.
Référence Journal of High Energy Physics, 2019, 7, 006
Publication Publié, 2019-07-02

Article révisé par les pairs

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Résumé :

A bstract We present a method to probe the Out-of-Time-Order Correlators (OTOCs) of a general system by coupling it to a harmonic oscillator probe. When the system’s degrees of freedom are traced out, the OTOCs imprint themselves on the generalized influence functional of the oscillator. This generalized influence functional leads to a local effective action for the probe whose couplings encode OTOCs of the system. We study the structural features of this effective action and the constraints on the couplings from microscopic unitarity. We comment on how the OTOCs of the system appear in the OTOCs of the probe.