A finite-radius Hayward metric turned into an anisotropic gravastar predicts chaotic photon rings and gravitational-wave echo trains above a compactness threshold x_m, but the GW170817 72 Hz match forces a very large length scale ℓ.
r-modes in the Tolman VII solution
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abstract
The r-mode frequencies of the Tolman VII solution for the slowly rotating non-barotropic approximation within the low frequency regime are estimated. The relativistic correction to Newtonian r-mode calculations is shown as function of the tenuity $\frac{R}{M}$ and is shown to be significant only for very compact neutron stars.
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Horizonless star based on regular black hole with finite radius and its observational signatures
A finite-radius Hayward metric turned into an anisotropic gravastar predicts chaotic photon rings and gravitational-wave echo trains above a compactness threshold x_m, but the GW170817 72 Hz match forces a very large length scale ℓ.