Basic Examples (4)
Construct a causal graph by randomly sprinkling 50 points within a diamond-shaped region of 1+1-dimensional Minkowski space:
Construct a subgraph of this causal graph corresponding to a smaller, interior diamond region:
Compute the entanglement entropy associated with this subgraph using the naive approach:
Highlight the interior subgraph within the larger (transitively-reduced) causal graph:
Highlight the interior subgraph within the full (i.e. transitively-closed) causal graph:
Construct a causal graph by randomly sprinkling 100 points within a diamond-shaped region of 2+1-dimensional Minkowski space:
Construct a subgraph of this causal graph corresponding to a smaller, interior diamond region:
Compute the entanglement entropy associated with this subgraph using the naive approach:
Highlight the interior subgraph within the larger (transitively-reduced) causal graph:
Highlight the interior subgraph within the full (i.e. transitively-closed) causal graph:
Construct a causal graph by means of a deterministic algorithmic process, e.g. Wolfram model evolution:
Select a random subgraph of the resulting causal graph:
Compute the entanglement entropy associated with this subgraph using the naive approach (note that, when an explicit dimension is not specified, CausalGraphEntanglementEntropyNaive will assume that the dimension of the causal graph is equal to 2):
Compute the entanglement entropy associated with this subgraph using the naive approach, assuming a causal graph dimension of 4 instead (yields an indeterminate result):
Highlight the interior random subgraph within the larger (transitively-reduced) causal graph:
When the Sorkin-Johnston Wightman function (or, equivalently, the Pauli-Jordan operator) of the corresponding causal set is not invertible, CausalGraphEntanglementEntropyNaive will return Indeterminate:
Highlight the interior subgraph within the larger (transitively-reduced) causal graph:
Scope (2)
CausalGraphEntanglementEntropyNaive currently supports the computation of causal set Green's functions (and hence entanglement entropies) in 1+1-dimensions:
2+1-dimensions:
And 3+1-dimensions:
When calling CausalGraphEntanglementEntropyNaive without any property specified, the property "EntanglementEntropy" is assumed by default:
Render the (transitively-reduced) causal graph:
Render the full (i.e. transitively-closed) causal graph instead:
Render the (transitively-reduced) interior subgraph of the overall causal graph:
Render the full (i.e. transitively-closed) interior subgraph of the overall causal graph instead:
Highlight the interior subgraph within the larger (transitively-reduced) causal graph:
Highlight the interior subgraph within the full (i.e. transitively-closed) causal graph instead: