Detecting Dark Blobs

Oct 19, 2018 - 4:00 pm to 5:00 pm

Campus, Varian 312

Dorota Grabowska (UC Berkeley)

Most current dark matter detection strategies, including both

direct and indirect efforts, are based on the assumption that the galactic

dark matter number density is quite high, allowing for the detection of

rare scattering events. Such a paradigm arises naturally if the dark

matter self-interactions are weak. However, strong interactions within the

dark sector can give rise to large composite objects, whose detection

requires a different experimental paradigm. We call these object Dark

Blobs. In such theories, the energy transfer due to a single collision

with a Standard Model particle tends to be small, below the energy

threshold of many nuclear recoil experiments. Fortunately, due to their

exponentially large composite nature, the interactions between these

objects and a terrestrial detector can be coherently enhanced. Therefore,

while the effect on a single probe is small, the large collective effect

can be quite dramatic and, importantly, above experimental thresholds. In

this talk, I will briefly motivate the early Universe formation of certain

types of Dark Blobs and then focus on multiple detection avenues for these