lee smolin claims that SUSY/string theory can account for negative (anti-DS) and zero cosmological constant, but not a positive de-sitter constant, which is what has been observed.(adsbygoogle = window.adsbygoogle || []).push({});

he also claims the kodama state in LQG has a good semiclassical limit that is GR, and incorporates a small positive CC, and that witten's paper on kodama-chern is not entirely applicable.

what's the current research on these claims?

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# A positive cosmological constant * SUSY/string theory

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