Over the horizon: Distinguishing the Schwarzschild spacetime and the $ℝ{ℙ}^{3}$ spacetime using an Unruh-DeWitt detector. Ng, K. K., Mann, R. B., & Martín-Martínez, E. Phys. Rev. D, 96:085004, American Physical Society, Oct, 2017.
Over the horizon: Distinguishing the Schwarzschild spacetime and the $ℝ{ℙ}^{3}$ spacetime using an Unruh-DeWitt detector [link]Paper  doi  bibtex   
@article{PhysRevD.96.085004,
  title = {Over the horizon: Distinguishing the Schwarzschild spacetime and the $\mathbb{R}{\mathbb{P}}^{3}$ spacetime using an Unruh-DeWitt detector},
  author = {Ng, Keith K. and Mann, Robert B. and Mart\'{\i}n-Mart\'{\i}nez, Eduardo},
  journal = {Phys. Rev. D},
  volume = {96},
  issue = {8},
  pages = {085004},
  numpages = {11},
  year = {2017},
  month = {Oct},
  publisher = {American Physical Society},
  doi = {10.1103/PhysRevD.96.085004},
  url = {https://link.aps.org/doi/10.1103/PhysRevD.96.085004}
}

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