QG2 - Quantum Gravity Phenomenology |
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Speaker |
Coumbe, Daniel |
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| Talk Title |
What Is Dimensional Reduction Really Telling Us? |
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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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