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Realising the no-boundary proposal of Hartle and Hawking as a consistent gravitational path integral has been a long-standing puzzle.
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G. Lemaitre, “Republication of: The beginning of the world from the point of view of quantum theory,” Nature
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J. Feldbrugge, J.-L. Lehners, and N. Turok, “Lorentzian Quantum Cosmology,” Phys. Rev
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J. Feldbrugge, J.-L. Lehners, and N. Turok, “No smooth beginning for spacetime,” Phys. Rev. Lett
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J.-L. Lehners, “No smooth beginning for spacetime,” Int. J. Mod. Phys
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Later among the works it cites.
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A. Vilenkin and M. Yamada, “Tunneling wave function of the universe,” Phys. Rev
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2019
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2018
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2018
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Cited in the paper.
S. P. de Alwis, “The Wave Function of the Universe and CMB Fluctuations,” arXiv:1811.12892 [hep-th]
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