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We show that axion stars formed from axions with nearly Planck-scale decayconstants $f$ are unstable to decay, and are unlikely to have phenomenologicalconsequences. More generally, we show how results at smaller $f$ cannot benaively extrapolated to $f=\mathcal{O}(M_P)$ as, contrary to conventionalwisdom, gravity and special relativity can both become relevant in the sameregime. We clarify the rate of decay by reviewing and extending previous workon oscillons and axion stars, which imply a fast decay rate even for so-calleddilute states at large $f$.

Global View of Axion Stars with (Nearly) Planck-Scale Decay Constants