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Surface singularities in Eddington-inspired Born-Infeld gravity

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arxiv 1209.2972 v2 pith:SOPRETWN submitted 2012-09-13 gr-qc astro-ph.CO

Surface singularities in Eddington-inspired Born-Infeld gravity

classification gr-qc astro-ph.CO
keywords gravitysingularitiesborn-infeldeddington-inspiredsurfacetheoryalternativecasts
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 doubts on its viability.

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