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.
Some implications of signature-change in cosmological models of loop quantum gravity
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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.
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gr-qc 1years
2024 1verdicts
CONDITIONAL 1representative citing papers
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Lessons for loop quantum gravity from emergent modified gravity
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.