In 4D Einstein-Gauss-Bonnet gravity, neutron stars turn unstable exactly at their maximum mass, but near the black hole limit some solutions regain stability, suggesting stable black-hole-sized objects.
Implementing Markov's Limiting Curvature Hypothesis
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abstract
The effective action for gravity at high curvatures is likely to contain higher derivative terms. These corrections may have profound consequences for the singularity structure of space-time and for early Universe cosmology. In this contribution, recent work is reviewed which demonstrates that it is possible to construct a class of effective gravitational actions for which all solutions with sufficient symmetries have limited curvature and are nonsingular. Near the limiting curvature, the coupling between matter and gravity goes to zero and in this sense the theory is asymptotically free.
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Neutron stars in 4D Einstein-Gauss-Bonnet gravity
In 4D Einstein-Gauss-Bonnet gravity, neutron stars turn unstable exactly at their maximum mass, but near the black hole limit some solutions regain stability, suggesting stable black-hole-sized objects.