Jul 5 – 12, 2017
Venice, Italy
Europe/Zurich timezone
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Detecting quantum gravity in the sky

Jul 7, 2017, 10:15 AM
Room Martinelli (Palazzo del Casinò)

Room Martinelli

Palazzo del Casinò

Parallel Talk Cosmology, Dark Energy, Gravitational Waves Cosmology, dark energy, gravitational waves


Dr Gianluca Calcagni (IEM-CSIC)


We show that the dimension of spacetime becomes complex-valued when its short-scale geometry is invariant under a discrete scaling symmetry. This characteristic can arise either in quantum gravities based on combinatorial or multifractal structures or as the partial breaking of continuous dilation symmetry in any conformal-invariant theory. With its infinite scale hierarchy, discrete scale invariance overlaps with the traditional separation between ultraviolet and infrared physics and it can leave an observable imprint in the cosmic microwave background. We discuss such imprint in the form of log oscillations and sharp features in the primordial power spectrum.

Primary author

Dr Gianluca Calcagni (IEM-CSIC)

Presentation materials