54 citations · 265 across the 15 of their papers we have counts for
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Non-commutative Geometry from Perturbative Quantum Gravity in de Sitter spacetime
Markus Fröb, William C. C. Lima, Albert Much +1
We show that a non-commutative structure arises naturally from perturbative quantum gravity in a de Sitter background metric. Our work builds on recent advances in the construction…
Cosmological Perturbations and Invariant Observables in Geodesic Lightcone Coordinates
Markus B. Fröb, William C. C. Lima
We consider a recent approach to the construction of gauge-invariant relational observables in gravity in the context of cosmological perturbation theory. These observables are con…
Hartle-Hawking state in the real-time formalism
Atsushi Higuchi, William C. C. Lima
We study self-interacting massive scalar field theory in static spacetimes with a bifurcate Killing horizon and a wedge reflection. In this theory the Hartle-Hawking state is defin…
Infrared problem in the Faddeev-Popov-ghost propagator in perturbative quantum gravity in de Sitter spacetime
Jos Gibbons, Atsushi Higuchi, William C. C. Lima
The propagators for the Faddeev-Popov (FP) ghosts in Yang-Mills theory and perturbative gravity in the covariant gauge are infrared (IR) divergent in de Sitter spacetime. An IR cut…
Graviton backreaction on the local cosmological expansion in slow-roll inflation
William C. C. Lima
We compute the graviton one-loop correction to the expectation value of the local expansion rate in slow-roll inflation, with both slow-roll parameters finite. The calculation is b…
Equivalence between the in-in perturbation theories for quantum fields in Minkowski spacetime and in the Rindler wedge
Atsushi Higuchi, William C. C. Lima
We investigate the relation between the time-ordered vacuum correlation functions for interacting real scalar fields in Minkowski spacetime and in the Rindler wedge. The correlatio…