Talk detail

Participant	Coumbe, Daniel
Institution	Jagiellonian University - ul. prof. Stanislaus - Krakow - N/A - Poland

Session	QG2	Accepted		Order	Time
Talk	Oral abstract	Title	What Is Dimensional Reduction Really Telling Us?
Coauthors
Abstract	We first review the evidence for dimensional reduction across a multitude of different approaches to quantum gravity. By examining the implications of dimensional reduction on Lorentz invariance and superluminal motion we argue that dimensional reduction should not be viewed as a real physical phenomenon, but rather as a hint at deeper underlying Planck scale physics. As a specific example we study dimensional reduction and superluminal motion in CDT quantum gravity and show that in order to preserve a scale invariant speed of light on all distance scales we must admit a modification to the nature of time. Experimental constraints placed on Lorentz invariance and dimensional reduction by cosmological observations are discussed throughout.
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Session	QG1	Accepted		Order	Time
Talk	Oral abstract	Title	Recent results in CDT quantum gravity
Coauthors
Abstract	We review some recent results in CDT quantum gravity. In particular we focus on the updated phase diagram of CDT, discussing the properties of the newly discovered bifurcation phase and its possible relation to a dynamical signature change of the metric. We also present results of dimensional reduction in the spectral dimension at various points in the parameter space of CDT and discuss how these results may be relevant to the asymptotic safety scenario.
Pdf file