One consequence of the special theory of relativity is that no signal can cause an effect
outside the source light cone, the space-time surface on which light rays emanate from the …

A bstract Resumming quantum fluctuations at the level of the gravitational path integral is
expected to result in non-local effective actions and thus in a non-trivial momentum …

Motivated by the recent attention on superluminal phenomena, we investigate the
compatibility between faster-than-c propagation and the fundamental principles of relativity …

The causality principle does not forbid negative group delays of analytic signals in electronic
circuits; in particular, the peak of a pulse can leave the exit port of a circuit before it enters …

Atomic three-level Λ systems dressed by two coherent electromagnetic fields can exhibit
coherent population trap** and electromagnetically induced transparency (EIT) due to …

In recent years, a physical phenomenon referred to as Negative Group Delay (NGD) or
superluminal wave propagation has been implemented in electronic circuitry and shown to …

There has been much recent interest in the study of superluminal pulse propagation;
however, all previous findings have been extremely limited, only observing superluminal …

Experiments have shown that individual photons penetrate an optical tunnel barrier with an
effective group velocity considerably greater than the vacuum speed of light. The …

Within the standard model extension (SME), we expand our previous findings on four
classes of violations of Super-Symmetry (SuSy) and Lorentz Symmetry (LoSy), differing in …

It is widely accepted that information cannot travel faster than c, the speed of light in
vacuum,,. Here, we investigate the behaviour of quantum correlations and information in the …