# Instabilities in the CDMT

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Could anyone explain or refer to references on why the CDMT f(R) gravity model suffers from Instabilities any why the sign of ${\mu}^{4}$ matters.

This post imported from StackExchange Physics at 2014-04-13 14:09 (UCT), posted by SE-user user38032

I don't know much about $f(R)$ gravity, but I don't know whether this "CDMT $f(R)$ model" is well-known among $f(R)$ gravity theorists. If it isn't you may want to give a short introduction to it if you want to attract good, or even original, answers.

@RonMaimon Yes, I agree. I hid the imported comment by "Jim" which said the same thing because I didn't realise that the "Metric $f(R)$ instability" question was imported here, so I thought it was irrelevant for us. Have you already posted it in the Close Vote Queue?

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