Effective field theory of loop quantum cosmology

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1 Citation (Scopus)

Abstract

Quantum cosmology is traditionally formulated in a minisuperspace setting, implicitly averaging fields over space to obtain homogeneous models. For universal reasons related to the uncertainty principle, quantum corrections then depend on the size of the averaging volume. In minisuperspace truncations, the value of this volume remains an arbitrary parameter devoid of physical meaning, but in an effective field theory it is identified with the infrared scale of inhomogeneous modes. Moreover, the infrared scale is running during gravitational collapse, when regions in which homogeneity remains approximately valid shrink to increasingly smaller co-moving sizes. Conceptual implications of this infrared renormalization for perturbative inhomogeneity in quantum cosmology are presented here, mainly for the example of loop quantum cosmology. Several claims made in this framework are altered by infrared renormalization.

Original languageEnglish (US)
Article number44
JournalUniverse
Volume5
Issue number2
DOIs
StatePublished - Feb 1 2019

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cosmology
gravitational collapse
homogeneity
inhomogeneity
approximation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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Effective field theory of loop quantum cosmology. / Bojowald, Martin.

In: Universe, Vol. 5, No. 2, 44, 01.02.2019.

Research output: Contribution to journalArticle

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