53 citations · 102 across the 7 of their papers we have counts for
7 papers
Mass of Dyonic Black Holes and Entropy Super-Additivity
Wei-Jian Geng, Blake Giant, H. Lu +1
We study extremal static dyonic black holes in four-dimensional Einstein-Maxwell-Dilaton theory, for general values of the constant in the exponential coupling of the…
BPS Kerr-AdS Time Machines
M. Cvetic, Wei-Jian Geng, H. Lu +1
It was recently observed that Kerr-AdS metrics with negative mass describe smooth spacetimes that have a region with naked closed time-like curves, bounded by a velocity of light s…
Godel Metrics with Chronology Protection in Horndeski Gravities
Wei-Jian Geng, Shou-Long Li, H. Lu +1
Gödel universe, one of the most interesting exact solutions predicted by General Relativity, describes a homogeneous rotating universe containing naked closed time-like curves (CTC…
Time Machines and AdS Solitons with Negative Mass
Xing-Hui Feng, Wei-Jian Geng, H. Lu
We show that in D=2n+1 dimensions, when mass is negative and all angular momenta are non-vanishing, Kerr and Kerr-AdS metrics describe smooth time machines, with no curvature singu…
Einstein-Vector Gravity, Emerging Gauge Symmetry and de Sitter Bounce
Wei-Jian Geng, H. Lu
We construct a class of Einstein-vector theories where the vector field couples bilinearly to the curvature polynomials of arbitrary order in such a way that only Riemann tensor ra…
Non-Abelian (Hyperscaling Violating) Lifshitz Black Holes in General Dimensions
Xing-Hui Feng, Wei-Jian Geng
We consider Einstein gravities coupled to a cosmological constant and multiple Yang-Mills fields in general dimensions and find that the theories admit colored Lifshitz sol…
Isotropic Expansion of Inhomogeneous Universe
Wei-Jian Geng, H. Lu
We propose a cosmological model that describes isotropic expansion of inhomogeneous universe. The energy-momentum tensor that creates the spatial inhomogeneity may not affect the u…