Strong Gravity as a Microscope for the Dark Universe (StronGMi)

Abstract

Observations firmly established that the 70% of our universe consists of dark energy, while a further 25 % of dark matter. The nature and origin of both dark components form some of the biggest puzzles in modern physics. Data suggest that on cosmological scales, dark matter behaves like dust, while dark energy mimics vacuum – or Einstein’s cosmological constant. The apparent simple cosmological dynamics may be deceptive and hide complicated degrees of freedom. In this project, we introduce novel tools towards understanding the nature of both components on galactic and shorter scales. In particular, we focus on the general frameworks of i) kinetic gravity braiding theories, as the only class of nontrivial single scalar-field models consistent with the recent measurement of gravitational wave speed and ii) superfluid dark matter which may solve the puzzles of galactic dynamics.