A relational quantum field theory for scalars is built from Poincaré-covariant quantum reference frames, yielding local observables and fields that satisfy causality and reproduce key Wightman and Algebraic QFT properties.
Relational quantum mechanics
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In a quantum Bianchi type-I cosmology, the conditional probability density for zero volume vanishes for all clock times, resolving the classical singularity via Page-Wootters relational dynamics.
Black hole paradoxes favor Wigner's Friend responses that posit intrinsic relationality and retrocausality.
Algebraic QFT on curved spacetime erases the distinction between physically real and fictional quantum states that exists in flat-space QM, and the state concept itself may be dispensable.
citing papers explorer
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Foundations of Relational Quantum Field Theory I: Scalars
A relational quantum field theory for scalars is built from Poincaré-covariant quantum reference frames, yielding local observables and fields that satisfy causality and reproduce key Wightman and Algebraic QFT properties.
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Singularity Resolution in Quantum Cosmology via Page-Wootters Formalism
In a quantum Bianchi type-I cosmology, the conditional probability density for zero volume vanishes for all clock times, resolving the classical singularity via Page-Wootters relational dynamics.
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What Do Black Holes Teach Us About Wigner's Friend?
Black hole paradoxes favor Wigner's Friend responses that posit intrinsic relationality and retrocausality.
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A skepticism on the concept of quantum state related to quantum field theory on curved spacetime
Algebraic QFT on curved spacetime erases the distinction between physically real and fictional quantum states that exists in flat-space QM, and the state concept itself may be dispensable.