Pani, Paolo and Sotiriou, Thomas P. (2012), "Surface Singularities in Eddington-Inspired Born-Infeld Gravity", PHYSICAL REVIEW LETTERS, 109, 25.
Abstract: Eddington-inspired Born-Infeld gravity was recently proposed as an
alternative to general relativity that offers a resolution of spacetime
singularities. The theory differs from Einstein's gravity only inside
matter due to nondynamical degrees of freedom, and it is compatible with
all current observations. We show that the theory is reminiscent of
Palatini f(R) gravity and that it shares the same pathologies, such as
curvature singularities at the surface of polytropic stars and
unacceptable Newtonian limit. This casts serious doubt on its viability.
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