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Planck-scale-modified dispersion relations in FRW spacetime
Giacomo Rosati, Giovanni Amelino-Camelia, Antonino Marciano +1
In recent years Planck-scale modifications of the dispersion relation have been attracting increasing interest also from the viewpoint of possible applications in astrophysics and…
Vacuum fluctuations in theories with deformed dispersion relations
Michele Arzano, Giulia Gubitosi, Joao Magueijo +1
We examine vacuum fluctuations in theories with modified dispersion relations which represent dimensional reduction at high energies. By changing units of energy and momentum we ca…
Gravity as the breakdown of conformal invariance
Giovanni Amelino-Camelia, Michele Arzano, Giulia Gubitosi +1
We propose that at the beginning of the universe gravity existed in a limbo either because it was switched off or because it was only conformally coupled to all particles. This pic…
On the initial singularity problem in rainbow cosmology
Grasiele Santos, Giulia Gubitosi, Giovanni Amelino-Camelia
It has been recently claimed that the initial singularity might be avoided in the context of rainbow cosmology, where one attempts to account for quantum-gravitational corrections…