C3 – Spacetime, Locality & QFT
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In https://pmc.ncbi.nlm.nih.gov/articles/PMC12315985/ (Wang et al., Science Advances, 2025), it is claimed that a Bell inequality is violated in a four-photon interference setup, even though the photons involved are not described as entangled within the system. The report names quantum indistinguishability via path identity as the mechanism and uses postselection on four-fold coincidences; the Bell parameter…
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The work by Koch, Riahinia & Rincon (Phys. Rev. D 112, 084056, 2025 / arXiv:2510.00117) introduces “q-desics” as quantum-corrected analogues of geodesics and derives an equation of motion based on expectation values of operators such as the affine connection (not only on ⟨g⟩). In the example of static, spherically symmetric quantum-gravity backgrounds, the authors report…
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Tracing ΛΛ̄ spin correlations back to the QCD vacuum: FBA handles, null tests, Pass/Fail
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4 min read
In https://doi.org/10.1038/s41586-025-09920-0, the STAR Collaboration reports a relative polarization of 18 ± 4% in ΛΛ̄ pairs and a strong dependence on the pair separation, which is read as a decoherence signature. From an FBA perspective, what is exciting is that an alleged “vacuum → detector” path can be operationalized as a channel: Which coarse-graining steps…