Variations of Starobinsky inflation in closed universes

Research output: Unpublished contribution to conferencePoster


Starobinsky inflation, often called $R^2$ inflation, is one of the most favoured inflationary models, according to Planck 2018 data. When studying inflationary models, one needs to choose realistic initial conditions, which in our case are chosen according to the Hartle-Hawking No Boundary Wave Proposal (NBWP), well motivated by quantum cosmology. In this context, higher order curvature corrections are important, and we therefore include them in the $R^2$ inflationary action. The NBWP results in closed Friedmann-Lemaître-Robertson-Walker universes, in contrast to the flat ones previously studied for Starobinsky inflation. For the first time, we investigate closed universes in the presence of these higher order corrections and its effect on the spectrum of the cosmic microwave background (CMB). These higher order corrections to $R^2$ inflation could be probed with the next generation CMB experiments. Furthermore, inflation can source a stochastic gravitational wave background, which could be probed with future 3G gravitational wave detectors. This will allow us to put bounds on this modified Starobinsky model.
Original languageEnglish
Publication statusUnpublished - 22 Mar 2023
EventRencontres de Moriond: Gravitation - Hotel Planibel, La Thuile, Italy
Duration: 18 Mar 202325 Mar 2023


ConferenceRencontres de Moriond
CityLa Thuile
Internet address


  • inflation


Dive into the research topics of 'Variations of Starobinsky inflation in closed universes'. Together they form a unique fingerprint.

Cite this