Fakeons and microcausality: light cones, gravitational waves and the Hubble constant

Understand

The concept of fake particle, or "fakeon", allows us to make sense of quantum gravity as an ultraviolet complete theory, by renouncing causality at very small distances.

• We investigate whether the violation of microcausality can be amplified or detected in the most common settings.
• We show that it is actually short range for all practical purposes.
• Due to our experimental limitations, the violation does not propagate along the light cones or by means of gravitational waves.