Discovery-HET Seminar: Assaf Ben-David – University of Copenhagen

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Discovery-HET Seminar: Assaf Ben-David

Speaker: Assaf Ben-David (NBIA)

Title: Searches for Mirror-Parity and Stringy Topologies in the CMB

Abstract: If inflation was relatively short, signatures of pre-inflationary physics could be observed on the largest scales of the CMB, breaking statistical isotropy. These scales, on which the cosmic variance is large, indeed show several anomalies. In this talk I will describe two searches for such isotropy-breaking evidence. One is the search for anomalous mirror-parity, motivated by some models of pre-inflationary relics. While past analysis of WMAP data has shown evidence for odd parity, I will present a closer examination of the anomaly on Planck data, shedding more light on this claim. The other search I will describe is for a non-trivial topology of the universe, which can lead to interesting symmetries in the CMB. I will consider some non-classical topologies allowed in string theory, and describe their observational signatures as well as the searches for these signatures in the CMB data.