Extension of the quantum theory of cosmological perturbations to the Planck era

By Iván Agulló, Abhay Ashtekar, W. Nelson. 2012

190 citations recorded by the source corpus.

Cosmological perturbations are generally described by quantum fields on (curved but) classical space-times. While this strategy has a large domain of validity, it can not be justified in the quantum gravity era where curvature and matter densities are of Planck scale. Using techniques from loop quantum gravity, the standard theory of cosmological perturbations is extended to overcome this limitation. The new framework sharpens conceptual issues by distinguishing between the true and apparent trans-Planckian difficulties and provides sufficient conditions under which the true difficulties can be overcome within a quantum gravity theory. In a companion paper, this framework is applied to the standard inflationary model, with interesting implications to theory as well as observations.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/447d3b7ecec3e22707ef1740730afcefc9d05a22

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In Astronomy and Astrophysics

In Nuclear and High Energy Physics

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Citations in the corpus

The pre-inflationary dynamics of loop quantum cosmology: confronting quantum gravity with observations (2012, methodology): “the space-time metric operator is given by [19]:”