I argue that cosmological data from the epoch of primordial inflation is catalyzing the
maturation of quantum gravity from speculation into a hard science. I explain why quantum …

We present a general method of deriving the effective action for conformal anomalies in any
even dimension, which satisfies the Wess-Zumino consistency condition by construction …

Cosmological inflation generates a spectrum of density perturbations that can seed the
cosmic structures we observe today. These perturbations are usually computed as the result …

We show that global de Sitter space is unstable to particle creation, even for a massive free
field theory with no self-interactions. The O (4, 1) de Sitter invariant state is a definite phase …

In addition to simple scale invariance, a universe dominated by dark energy naturally gives
rise to correlation functions possessing full conformal invariance. This is due to the …

The Euclidean or Bunch-Davies O (4, 1) invariant state for quantum fields in global de Sitter
space is shown to be unstable to small perturbations, even for a massive free field with no …

The low energy effective action of gravity in any even dimension generally acquires nonlocal
terms associated with the trace anomaly, generated by the quantum fluctuations of massless …

We briefly overview the basic properties and generic behavior of circular equatorial particle
orbits and light rings around regular rotating compact objects with dark energy interiors …

We investigate up to which order quantum effects can be neglected in calculating
cosmological correlation functions after horizon exit. We study, as a toy model, ϕ 3 theory on …

Recently, the production of primordial black holes (PBHs) and secondary gravitational
waves (GWs) due to enhanced scalar power on small scales have garnered considerable …