1.9k citations · 11.3k across the 80 of their papers we have counts for
81 papers
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…
Effective Field Theories for Material Media
Angelo Esposito, Alberto Nicolis, Riccardo Penco
We review recent progress in understanding certain aspects of condensed matter systems from a high energy theory perspective. We discuss effective field theories that describe coll…
Hadamard tails from flat-space perturbation theory
Ameya Chavda, Alberto Nicolis, Alessandro Podo +1
The short-distance singular structure of the two-point function of a free scalar field in curved spacetime has a universal behavior that characterizes well-behaved states (called H…
Microcausality without Lorentz invariance
Lam Hui, Alberto Nicolis, Alessandro Podo +1
Microcausality -- the vanishing of commutators outside the lightcone -- is a fundamental property of relativistic quantum field theories. We derive its implications for two-point f…
-matrix positivity without Lorentz invariance: a case study
Lam Hui, Ioanna Kourkoulou, Alberto Nicolis +2
We investigate the analytic structure of scattering amplitudes in theories in which Lorentz invariance is spontaneously broken. We do so by computing and studying the S-matrix for…
Apparently superluminal superfluids
Ioanna Kourkoulou, Michael J. Landry, Alberto Nicolis +1
We consider the superfluid phase of a specific renormalizable relativistic quantum field theory. We prove that, within the regime of validity of perturbation theory and of the supe…