Speaker
Description
We point out that the Kalb-Ramond field of string theory can help to generate a $U_{Y}(1)$ portal to dark matter. This entails the possibility that the $U_{Y}(1)$ gauge field is related to a fundamental vector field for open string interactions. The $U_{Y}(1)$ portal also implies dipole and fluorescent dark matter couplings of the form initially suggested by Profumo and Sigurdson [1], and used by Conlon et al. to explain the anomalies in the 3.5 keV data from Perseus. The requirement to explain the observed dark matter abundance relates the coupling scale M in the corresponding low-energy effective $U_{Y}(1)$ portal to the dark matter mass $m_{χ}$. The corresponding electron recoil cross sections for a dipole coupled dark matter species are below the limits from XENON, SuperCDMS and SENSEI, but above the neutrino floor.
