For many years advances in fundamental physics consisted in pushing the high energy limit of our knowledge higher and higher. In the last decade, cosmology has been flooded with such an amount of high precision data that a new, 'low energy path' to the mysteries of nature is now at hand. My research in cosmology focuses mainly on the two periods of accelerated expansion that our data strongly indicate and that are calling for a deeper understanding.
Inflation is an excellent low energy window on the highest energies. I worked on primordial non-gaussianities and models with varying speed of sound. I am very interested in fundamental aspects such as the relation between symmetries in inflationary theories and the almost scale invariance of the observed power spectrum.
Dark energy (the current acceleration of the universe), rather than just a low energy window seems to insinuate that some new unraveled physics is effective already at unexpectedly low energies. Such an amazing phenomenon may suggest that the standard low-energy framework `gravity+matter fields' is just inadequate and needs to be modified. I proposed an infrared modification of general relativity dictated by an 'ultra strong' version of the equivalence principle that seem to ease also other difficulties such as the cosmological constant problem and the black hole information paradox.
Violations of the (standard!) equivalence principle and gravitational phenomenology are another main branch of my research. I worked both on string-inspired model (the `runaway dilaton') and on simple scalar extension of the standard model (the 'higgs portal').
I also worked at the intersection between gravity and quantum information and considered regions of space as quantum subsystems as a way to generalize the standard framework of semi-classical gravity.