Stable, Thin Wall, Negative Mass Bubbles in de Sitter Space-Time

@article{Johnson2020StableTW,
  title={Stable, Thin Wall, Negative Mass Bubbles in de Sitter Space-Time},
  author={Matthew Camp Johnson and M. B. Paranjape and Antoine Savard and Natalia Tapia-Arellano},
  journal={Quantum Theory and Symmetries},
  year={2020}
}
Negative mass makes perfect physical sense as long as the dominant energy condition is satisfied by the corresponding energy-momentum tensor. Heretofore, only {\it configurations} of negative mass had been found \cite{Belletete:2013nqa,Mbarek:2014ppa}, the analysis did not address stability or dynamics. In this paper, we analyze both of these criteria. We demonstrate the existence of {\it stable}, static, negative mass bubbles in an asymptotically de Sitter space-time. The bubbles are solutions… 
Negative Mass Black Holes in de-Sitter Space
We show that asymptotically de Sitter black holes of negative mass can exist in Lovelock gravity. Such black holes have horizon geometries with non-constant curvature and are known as Exotic Black

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