Some implications of signature-change in cosmological models of loop quantum gravity

Martin Bojowald, Jakub Mielczarek

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Abstract

Signature change at high density has been obtained as a possible consequence of deformed space-time structures in models of loop quantum gravity. This article provides a conceptual discussion of implications for cosmological scenarios, based on an application of mathematical results for mixed-type partial differential equations (the Tricomi problem). While the effective equations from which signature change has been derived are shown to be locally regular and therefore reliable, the underlying theory of loop quantum gravity may face several global problems in its semiclassical solutions.

Original languageEnglish (US)
Article number052
JournalJournal of Cosmology and Astroparticle Physics
Volume2015
Issue number8
DOIs
StatePublished - Aug 1 2015

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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