From wiki: Tegmark elaborates the mathematical universe hypothesis (MUH, a.k.a. “Ultimate Ensemble”) into the Computable Universe Hypothesis (CUH), which posits that all computable mathematical structures exist.
We can conclude that “anything that isn’t disallowed, using our current model of physics” is only a subset of “anything that can be described using any arbitrary computable mathematical structure”.
From wiki: Tegmark elaborates the mathematical universe hypothesis (MUH, a.k.a. “Ultimate Ensemble”) into the Computable Universe Hypothesis (CUH), which posits that all computable mathematical structures exist.
We can conclude that “anything that isn’t disallowed, using our current model of physics” is only a subset of “anything that can be described using any arbitrary computable mathematical structure”.