Author

Luca Apadula

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Preprint Jul 2026

Frame-Dependent Traces and the Third-Particle Paradox

The Paradox of the Third Particle arises when comparing subsystem descriptions across Quantum Reference Frame (QRF) perspectives. We isolate two distinct origins of the Paradox: the QRF covariance of the partial trace and the failure of the physical Hilbert space to inherit the kinematical tensor-product structure. We...

Alessandro Palumbo, Luca Apadula · 1 citation · ⚡1