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Kiefer, C. (2000) Conceptual Issues in Quantum Cosmology. In: Kowalski-Glikman, J., Ed., Toward Quantum Gravity, Vol. 541, Springer-Verlag, New York, 158-187.
https://doi.org/10.1007/3-540-46634-7_7

has been cited by the following article:

• TITLE: How Kieffer Density Matrix Formalism Aids Different Initial Time Steps, Leading to Lorentz Violations, and Breakup of Primordial Black Holes for GW Generation

  AUTHORS: Andrew Beckwith

  KEYWORDS: Kieffer Density Matrix, Initial Time, Lorentz Violations, Black Holes

  JOURNAL NAME: Journal of High Energy Physics, Gravitation and Cosmology, Vol.7 No.4, September 28, 2021

  ABSTRACT: A result from Kieffer, as outlined at the beginning of the article identifies two different candidates for initial time steps, delta t. We assert that this difference in time steps may be related to a specific early universe Lorentz Violation. The author asserts that the existence of early universe Lorentz violation in turn is assisting in a breakup of primordial black holes. And that also has a tie into Kieffer different time steps as outlined. And the wrap up is given in the final part of this document.