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For Whom Does Bell Hold?
Daniel Green, Kshitij Gupta, Qiya Zhang
Violations of Bell's inequalities offer a definitive signal of non-classical (quantum) behavior in local deterministic systems. Yet, in many physical settings where quantum mechani…
The Quantum Mechanics of Rare Events: From Quantum Walks to Stochastic Inflation
Daniel Green, Kshitij Gupta, Akhil Premkumar
Rare fluctuations in physical systems depend on the detailed microphysics responsible for the fluctuations. In classical statistical systems, the large deviation principle has eluc…
Quantum Walks and Exact RG in de Sitter Space
Daniel Green, Kshitij Gupta
The local physics of light scalar fields in de Sitter space is well described by classical random walks, as expressed through the framework of Stochastic Inflation. Recent work has…
Soft Metric Fluctuations During Inflation
Daniel Green, Kshitij Gupta
The conservation of the long wavelength fluctuations of the metric plays a vital role in cosmology as the link between quantum fluctuations during inflation and late time observati…
A Goldstone Boson Equivalence for Inflation
Daniel Green, Kshitij Gupta, Yiwen Huang
The effective field theory of single-field inflation characterizes the inflationary epoch in terms of a pattern of symmetry breaking. An operator acquires a time-dependent vacuum e…