A semiclassical singularity theorem

@article{Fewster2022ASS,
  title={A semiclassical singularity theorem},
  author={Christopher J. Fewster and Eleni-Alexandra Kontou},
  journal={Classical and Quantum Gravity},
  year={2022},
  volume={39}
}
Quantum fields do not satisfy the pointwise energy conditions that are assumed in the original singularity theorems of Penrose and Hawking. Accordingly, semiclassical quantum gravity lies outside their scope. Although a number of singularity theorems have been derived under weakened energy conditions, none is directly derived from quantum field theory. Here, we employ a quantum energy inequality satisfied by the quantized minimally coupled linear scalar field to derive a singularity theorem… 
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