QG2 - Quantum Gravity Phenomenology |
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Speaker |
Gubitosi, Giulia |
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Coauthors |
Amelino-Camelia, Giovanni; Arzano, Michele; Magueijo, Joao |
| Talk Title |
Dimensional reduction and scale-invariant primordial fluctuations |
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Abstract |
I discuss the properties of vacuum fluctuations in theories with non-trivial momentum space geometry which represent dimensional running at high energies, showing that in all theories which run to 2 dimensions in the ultraviolet the vacuum fluctuations, in this regime, are scale-invariant. This is true in flat space but also for “inside the horizon” modes in an expanding universe. I discuss the conditions upon the gravity theory for this scale-invariance to be preserved as the modes are frozen-in outside the horizon. |
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