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In approaches to quantum gravity, where smooth spacetime is an emergent approximation of a discrete Planckian fundamental structure, any standard effective field theoretical description will miss part of the degrees of freedom and thus break unitarity.
Difficulties for the Evolution of Pure States Into Mixed States
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W. G. Unruh · 1989
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Time in quantum gravity: An hypothesis
Carlo Rovelli · 1991
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On evolution laws taking pure states to mixed states in quantum field theory
William G. Unruh and Robert M. Wald · 1995
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Absence of singularity in loop quantum cosmology
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Quantum Nature of the Big Bang: Improved dynamics
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Loop Quantum Cosmology: A Status Report
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Stefano Liberati, Giovanni Tricella, and Andrea Trombettoni · 2019
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Unitarity and information in quantum gravity: a simple example
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J. Fernando Barbero G. and Alejandro Perez · 2015
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Partner particles for moving mirror radiation and black hole evaporation
M. Hotta, R. Schützhold, and W. G. Unruh · 2015
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Non-Paradoxical Loss of Information in Black Hole Evaporation in a Quantum Collapse Model
Sujoy K. Modak, Leonardo Ortíz, Igor Peña, and Daniel Sudarsky · 2015
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Private communication
Varadarajan Madhavan
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Lautaro Amadei, Hongguang Liu, and Alejandro Perez · 2019
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Particle and energy cost of entanglement of Hawking radiation with the final vacuum state
Robert M. Wald · 2019
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