A small non-vanishing cosmological constant from the Krein-Gupta-Bleuler vacuum
arXiv:1808.02728 · doi:10.1016/j.physletb.2018.09.017
Abstract
We point out a potential relevance between the Krein-Gupta-Bleuler (KGB) vacuum leading to a fully covariant quantum field theory for gravity in de Sitter (dS) spacetime and the observable smallness of the cosmological constant. This may provide a formulation of linear quantum gravity in a framework amenable to developing a more complete theory determining the value of the cosmological constant.
3 pages