737 citations · 5.3k across the 53 of their papers we have counts for
25 papers · 1 filter
Quantum limit to transparency
Angelo Esposito, Alberto Nicolis, Federico Piazza
We argue that no material can be made completely transparent to light as long as it has a nontrivial index of refraction. The quantum decay of photons into phonons is an ineliminab…
Subadditive Average Distances and Quantum Promptness
Federico Piazza, Andrew J. Tolley
A central property of a classical geometry is that the geodesic distance between two events is \emph{additive}. When considering quantum fluctuations in the metric or a quantum or…
Rotating cosmologies: classical and quantum
Alberto Nicolis, Federico Piazza, Kenza Zeghari
We revisit spatially flat, anisotropic cosmologies within the framework of mini-superspace. Putting special emphasis on the symmetries of the mini-superspace action and on the asso…
About non-classical gravitational states
Federico Piazza
Take the gravitational field, a number of macroscopic observers and put them in a highly-quantum state, made by a coherent superposition of different classical configurations. How…
Glimmers of a post-geometric perspective
Federico Piazza
Quantum gravitational effects can become important at low energy if the wavefunction of the metric field fails to be peaked around a classical configuration. We try to understand s…
Gaugid inflation
Federico Piazza, David Pirtskhalava, Riccardo Rattazzi +1
The spectrum of primordial gravitational waves is one of the most robust inflationary observables, often thought of as a direct probe of the energy scale of inflation. We present a…