Speaker
Description
While the standard cosmological model assumes a flat, simply-connected, infinite universe, the possibility of having a non-trivial spatial topology is still a viable scenario that is potentially detectable in the not so distant future. For the past few decades, the cosmic topology community has almost exclusively focused on scalar-sourced temperature correlations in the cosmic microwave background (CMB) to look for hints of the shape of the Universe, whereas the effect of non-trivial topologies in CMB polarization has been widely unattended. In this talk, I will present some of the latest results of the COMPACT collaboration on scalar and tensor perturbations in Euclidean topologies. In particular, I will show how the breaking of statistical isotropy and/or parity naturally leads to the appearance of non-zero EB and TB correlations without the need to introduce any parity-violating microphysics (e.g., axions) and how the correlation patterns in tensor perturbations seem to contain more "information" than scalar perturbations about the shape of the Universe.
