The Dark Dimension and its interplay with recent cosmological data (Theory)
by
Georges Obied(U of Oxford)
→
Europe/Berlin
SR2
SR2
Description
In this talk, I will discuss the motivation for considering an extra mesoscopic Dark Dimension of length l ~ 1 - 10 microns, taking into account theoretical and observational arguments. I will then talk about cosmological aspects of the Dark Dimension. In particular this scenario leads, by the universal coupling of the Standard Model sector to bulk gravitons, to massive spin 2 KK excitations of the graviton in the Dark Dimension (the “dark gravitons”) as an unavoidable dark matter candidate. Observations allow such an extra dimension of size in the micron range, as above, and predict a dark matter mass around 100 keV. Finally, I will comment on how this scenario can naturally accommodate features recently observed by the DESI survey such as an effective dark energy equation of state that is smaller than -1.
