In conical spacetimes with d>1, NSS prohibits operationally detectable causal loops across classical, quantum and post-quantum theories, unlike the (1+1) case.
Embedding cyclic causal structures in acyclic spacetimes: no-go results for process matrices
3 Pith papers cite this work, alongside 13 external citations. Polarity classification is still indexing.
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Defines polyslot pslot[C] and srep[C] constructions on symmetric monoidal categories that reconstruct unitary supermaps and forbid time-loops in composition, with equivalence shown on path-contraction groupoids.
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Impossibility of superluminal signalling rules out causal loops in conical spacetimes
In conical spacetimes with d>1, NSS prohibits operationally detectable causal loops across classical, quantum and post-quantum theories, unlike the (1+1) case.
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Polycategorical Constructions for Unitary Supermaps of Arbitrary Dimension
Defines polyslot pslot[C] and srep[C] constructions on symmetric monoidal categories that reconstruct unitary supermaps and forbid time-loops in composition, with equivalence shown on path-contraction groupoids.
- Characterizing Signalling: Connections between Causal Inference and Space-time Geometry