Quantum Information, Causality and Negative Energy
Negative energy density can arise naturally in Quantum Field Theory - the theoretical framework with which we describe fundamental particle physics and the matter which makes up our universe. However too much negative energy density can lead to pathologies when coupling this matter to gravity via Einstein’s equations. In this talk I will discuss conjectured bounds on negative energy density that can rule out such pathologies and sketch very recent general proofs of these bounds. The methods we use combine causality considerations with concepts taken from the study of quantum information. I will discuss how this provides further evidence for deep connections between gravity and quantum information.