36 citations · 98 across the 6 of their papers we have counts for
6 papers
Analytical evaluation of cosmological correlation functions
T. Heckelbacher, I. Sachs, E. Skvortsov +1
Using the Schwinger-Keldysh-formalism, reformulated in arXiv:2108.01695 as an effective field theory in Euclidean anti-de Sitter, we evaluate the one-loop cosmological four-point f…
Analytical evaluation of AdS Witten diagrams as flat space multi-loop Feynman integrals
Till Heckelbacher, Ivo Sachs, Evgeny Skvortsov +1
We describe a systematic approach for the evaluation of Witten diagrams for multi-loop scattering amplitudes of a conformally coupled scalar -theory in Euclidean AdS, by r…
Asymptotic dynamics and charges for FLRW spacetimes
Martin Enriquez-Rojo, Till Heckelbacher, Roberto Oliveri
We investigate the asymptotia of decelerating and spatially flat FLRW spacetimes at future null infinity. We find that the asymptotic algebra of diffeomorphisms can be enlarged to…
Holography and black holes in asymptotically flat FLRW
Martin Enriquez-Rojo, Till Heckelbacher
In this paper, we extend the treatment of asymptotically decelerating spatially flat FLRW spacetimes initiated in [1]. We show that a certain class of those metrics is ruled by the…
Asymptotic symmetries in spatially flat FRW
Martin Enriquez-Rojo, Till Heckelbacher
We perform an off-shell treatment of asymptotically decelerating spatially flat FRW spacetimes at future null infinity. We obtain supertranslation and superrotation-like asymptotic…
Loops in dS/CFT
Till Heckelbacher, Ivo Sachs
We consider the semi-classical expansion of the Bunch-Davies wavefunction with future boundary condition in position space for a real scalar field, conformally coupled to a classic…