I know that string theory tells us that 10 space-time dimensions have a rather special property, namely that a certain central charge vanishes. This allows for an anomaly-free quantization of s.t.(adsbygoogle = window.adsbygoogle || []).push({});

Two questions:

- are there other statements (not necessarily from s.t.) that something special happens in 4 dimensions?

- are there s.t. based arguments that exactly 6 of 10 dimensions are compactified?

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# Something special about four dimensions?

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