6 December 2021

Space Science at Droptower SEMINAR TALK

Location: ZARM Bremen - Online seminar
When: 6.12.2021, 17:00 CET - Online

Speaker: Sofie Marie Koksbang (University of Southern Denmark, Denmark)

Title: Observational signatures of cosmic backreaction with concrete abstract cosmology

Abstract: Cosmic backreaction is a phenomenon that appears in the study of inhomogeneous cosmology and which originally gained attention because it e.g. can lead to apparent accelerated expansion of the universe. However, it is at this point unclear to what extent cosmic backreaction is relevant for our universe. One of the methods for revealing its importance is using observational tests that can either reveal a deviation from FLRW behavior or directly reveal effects of cosmic backreaction.
In this talk, I will give a brief review of cosmic backreaction and some of the earlier developed FLRW consistency relations. Then I will define the concept of "concrete abstract cosmology" before going through the observational signatures of backreaction and more generally observational relations in inhomogeneous cosmological models that have been uncovered with this approach.