Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2015/08/052
Keywords
quantum cosmology; physics of the early universe; transplanckian physics
Funding
- NSF grant [PHY-1307408]
- National Centre of Science [DEC-2014/13/D/ST2/01895]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1307408] Funding Source: National Science Foundation
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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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