Speaker
Description
Unimodular Gravity is an infrared modification of General Relativity where the cosmological constant is replaced by an integration constant, thus free from radiative corrections and effectively solving one piece of the cosmological constant problem. Apart from this, both theories enjoy the same classical
dynamics, dictated by Einstein equations, and they were thought to be equivalent for any other matter. We show that, contrary to this common lore, Unimodular Gravity and General Relativity are two different gravitational theories once loop corrections are taken into account. Due to the presence of different gauge groups, gravitons run inside loop corrections in a different manner. We show this phenomenon in a simple example and discuss its possible consequences.
