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A significant step towards a rigorous understanding of perturbative gravitational entropy was recently achieved by a series of works showing that a proper accounting of gauge invariance and observer degrees of freedom converts the Type III algebra of QFT observables in a gravitational subregion to a Type II crossed product, whose entropy reduces to the generalized entropy formula in a semiclassical limit.
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“Operational Quantum Physics” 31
Paul Busch, Marian Grabowski and Pekka. Lahti · 1995
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Donald Marolf · 1995
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“A Uniqueness theorem for constraint quantization”
Domenico Giulini and Donald Marolf · 1999
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“On the generality of refined algebraic quantization”
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Donald Marolf · 2000
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“Notes on space-time thermodynamics and the observer dependence of entropy”
Donald Marolf, Djordje Minic and Simon. Ross · 2004
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Carl Dolby · 2004
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“The role of type III factors in quantum field theory”
Jakob Yngvason · 2005
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“Holographic Derivation of Entanglement Entropy from the anti–de Sitter Space/Conformal Field Theory Correspondence”
Shinsei Ryu and Tadashi Takayanagi · 2006
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B. Losic and W.. Unruh · 2006
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Philipp. Höhn, Marius Krumm and Markus. Müller · 2022
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Anne-Catherine de Hamette, Stefan. Ludescher and Markus. Müller · 2022
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Samuel Leutheusser and Hong Liu · 2023
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Samuel Leutheusser and Hong Liu · 2023
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Venkatesa Chandrasekaran, Roberto Longo, Geoff Penington and Edward Witten · 2023
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Rodolfo Gambini, Rafael. Porto, Jorge Pullin and Sebastian Torterolo · 2009
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Martin Bojowald · 2010
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