Abstract
It is shown how the 300 rays associated with the antipodal pairs of vertices of a 120-cell (a four-dimensional regular polytope) can be used to give numerous “parity proofs” of the Kochen–Specker theorem ruling out the existence of noncontextual hidden variables theories. The symmetries of the 120-cell are exploited to give a simple construction of its Kochen–Specker diagram, which is exhibited in the form of a “basis table” showing all the orthogonalities between its rays. The basis table consists of 675 bases (a basis being a set of four mutually orthogonal rays), but all the bases can be written down from the few listed in this paper using some simple rules. The basis table is shown to contain a wide variety of parity proofs, ranging from 19 bases (or contexts) at the low end to 41 bases at the high end. Some explicit examples of these proofs are given, and their implications are discussed.
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Notes
The dual of a 24-cell is another 24-cell rotated relative to the first (about their common center), with the vertices of the dual being along the same directions as the cell centers of the original, and vice-versa.
The multiplicity of a ray is the number of bases it occurs in.
The Kochen–Specker diagram of a set of rays is a graph whose vertices are the rays and whose edges connect vertices corresponding to orthogonal rays.
Since \(V\) and \(W\) are symmetry operations of the 120-cell, they can be described by the permutations they perform on its vertices: \(V\) replaces the ray \(i\) by the ray \((i+60)\) mod 300, while \(W\) replaces ray \(i\) by \(i+12\) if \(60n < i \le 60n+48\) for \(n=0,1,2,3,4\), or by \(i-48\) otherwise. The operator \(U\) also performs a permutation, but it cannot be described simply.
The 24-cell, 600-cell and 120-cell are all centrally symmetric figures whose vertices come in antipodal pairs.
A noncontextual value assignment to a ray is one in which the ray is assigned the same value in all the bases in which it occurs.
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Waegell, M., Aravind, P.K. Parity Proofs of the Kochen–Specker Theorem Based on the 120-Cell. Found Phys 44, 1085–1095 (2014). https://doi.org/10.1007/s10701-014-9830-0
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DOI: https://doi.org/10.1007/s10701-014-9830-0