Eur. Phys. J. C 80, 1209 (2020)                                 arXiv link

Vacua and exact solutions in lower-D limits of EGB

Liang Ma & H. Lü

Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, Tianjin, 300350, China

Abstract

We consider the action principles that are the lower dimensional limits of the Einstein–Gauss–Bonnet gravity via the Kaluza–Klein route. We study the vacua and obtain some exact solutions. We find that the reality condition of the theories may select one vacuum over the other from the two vacua that typically arise in Einstein–Gauss–Bonnet gravity. We obtain exact black hole and cosmological solutions carrying scalar hair, including scalar hairy BTZ black holes with both mass and angular momentum turned on. We also discuss the holographic central charges in the asymptotic AdS backgrounds.