The pre-inflationary dynamics of loop quantum cosmology: Confronting quantum gravity with observations

Ivan Agullo, Abhay Ashtekar, William Nelson

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

Using techniques from loop quantum gravity, the standard theory of cosmological perturbations was recently generalized to encompass the Planck era. We now apply this framework to explore pre-inflationary dynamics. The framework enables us to isolate and resolve the true trans-Planckian difficulties, with interesting lessons both for theory and observations. Specifically, for a large class of initial conditions at the bounce, we are led to a self consistent extension of the inflationary paradigm over the 11 orders of magnitude in density and curvature, from the big bounce to the onset of slow roll. In addition, for a narrow window of initial conditions, there are departures from the standard paradigm, with novel effects - such as a modification of the consistency relation between the ratio of the tensor to scalar power spectrum and the tensor spectral index, as well as a new source for non-Gaussianities - which could extend the reach of cosmological observations to the deep Planck regime of the early universe.

Original languageEnglish (US)
Article number085014
JournalClassical and Quantum Gravity
Volume30
Issue number8
DOIs
StatePublished - Apr 21 2013

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cosmology
tensors
gravitation
power spectra
universe
curvature
scalars
perturbation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "Using techniques from loop quantum gravity, the standard theory of cosmological perturbations was recently generalized to encompass the Planck era. We now apply this framework to explore pre-inflationary dynamics. The framework enables us to isolate and resolve the true trans-Planckian difficulties, with interesting lessons both for theory and observations. Specifically, for a large class of initial conditions at the bounce, we are led to a self consistent extension of the inflationary paradigm over the 11 orders of magnitude in density and curvature, from the big bounce to the onset of slow roll. In addition, for a narrow window of initial conditions, there are departures from the standard paradigm, with novel effects - such as a modification of the consistency relation between the ratio of the tensor to scalar power spectrum and the tensor spectral index, as well as a new source for non-Gaussianities - which could extend the reach of cosmological observations to the deep Planck regime of the early universe.",
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The pre-inflationary dynamics of loop quantum cosmology : Confronting quantum gravity with observations. / Agullo, Ivan; Ashtekar, Abhay; Nelson, William.

In: Classical and Quantum Gravity, Vol. 30, No. 8, 085014, 21.04.2013.

Research output: Contribution to journalArticle

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