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

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arxiv 1503.09154 v1 pith:FDEAYI7B submitted 2015-03-31 gr-qc astro-ph.COhep-th

Martin Bojowald , Jakub Mielczarek This is my paper · ORCID
classification gr-qcastro-ph.COhep-th
keywords gravityloopquantumbeenchangecosmologicalequationsimplications
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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.

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  1. Lessons for loop quantum gravity from emergent modified gravity

    gr-qc 2024-11 conditional novelty 6.0 of 10

    Emergent modified gravity rules out most proposed loop quantum gravity black-hole models and shows that mu0 and mu-bar holonomy schemes are canonically equivalent, so they are not physically distinct.

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