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aaronsw comments on The Fabric of Real Things - Less Wrong
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Mainstream status:
The introduction to causality is intended to be bog-standard. All departures from mainstream academia are errors and should be flagged accordingly.
I can't particularly recall hearing anyone suggest that a universe is a connected fabric of causes and effects in the Pearlian sense of causality. Since Special Relativity there have been many suggestions that a universe is a connected fabric of 'events', or points in spacetime.
I can't particularly recall reading that you can only meaningfully talk about things you can find by tracing causal links (this theory will be developed further in upcoming posts).
Wolfram 2002 argues that spacetime may actually be a discrete causal network and writes:
Later, in 10.9, he discusses using graphical causal models to fit observed data using Bayes' rule. I don't know if he ever connects the two points, though.
Few words: CPT symmetry. The causality is just how we model things at macroscopic scale where the time symmetry is broken thermodynamically. At the bottom level, it's relations that have to be true, and to say that value of one variable in a relation causes value of other variable in a relation is either a minor language misuse or a gross misunderstanding arising from such misuse.