English

Time problem in primordial perturbations

General Relativity and Quantum Cosmology 2024-05-08 v4

Abstract

We study the non-unitary relation between quantum gravitational models defined using different internal times. We show that despite the non-unitarity, it is possible to provide a prescription for making unambiguous, though restricted, physical predictions independent of specific clocks. To illustrate this result, we employ a model of quantum gravitational waves in a quantum Friedmann universe.

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Cite

@article{arxiv.2401.06887,
  title  = {Time problem in primordial perturbations},
  author = {Alice Boldrin and Przemysław Małkiewicz and Patrick Peter},
  journal= {arXiv preprint arXiv:2401.06887},
  year   = {2024}
}

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Corrected typos

R2 v1 2026-06-28T14:15:43.712Z