BTZ gems inside regular Born-Infeld black holes

Understand

The regular black hole solution arising as a spherically symmetric vacuum solution of Born-Infeld gravity possesses an asymptotic interior structure which is very well described by a four dimensional generalization of the non-rotating BTZ metric.

• According to this picture no singularity exists, and instead, infalling observers experience a constant curvature manifold as they travel towards future null infinity.
• This is characterized by the BTZ event horizon.
• The exterior structure of the black hole is also studied, and it is shown that it corresponds to the Schwarzschild solution provided the black hole mass is not too small.