Fragility of stealth solutions in mimetic gravity

Alireza Allahyari, Clarisse Donio, Mohammad Ali Gorji +2

We study a broad class of constrained mimetic-type extensions of general relativity with action $S=\int {\mathrm{d}}^{4}x\sqrt{-g}(R/2+\lambda C[g,\Psi ]+{\mathcal{L}}_{\mathrm{m}})$, where $R$ i…