Supernova 1987A provides strong constraints on dark-sector particles with masses below ~100 MeV. If such particles are produced in sufficient quantity, they reduce the cooling time of the supernova, in conflict with observations. We consider the resulting constraints on dark photons, sub-GeV dark matters coupled to dark photons, milli-charged particles and axions. For the first time, we...
The sensitivity of direct-detection experiments looking for sub-GeV dark matter is bounded below as sufficiently weakly interacting dark matter does not produce enough events to be detected. However, the sensitivity is also bounded above as sufficiently strongly interacting dark matter is slowed down below the threshold by its interactions with the medium above the experiment. The upper...
Many dark matter studies have considered indirect detection~($\chi\chi\rightarrow f f$), direct detection~($\chi f\rightarrow \chi f$), and collider searches~($f f\rightarrow \chi \chi$). We propose a new strategy in searching for dark matter elastic cross section by considering cosmic-ray propagation in the galactic dark matter halo. We find that cosmic rays can lose significant fraction...
ABRACADABRA10cm is a new experiment which seeks to detect
axion dark matter through its interactions with the electromagnetic field. The experiment, which is planned to start collecting data this year, will probe unstudied regions of axion parameter space and lay the groundwork for future, larger-scale efforts. I will discuss the results of numerical and analytical work towards understanding...
We propose a "Light Shining Through Walls"-type experiment to search for axions using high-Q superconducting RF cavities. Our setup uses a gapped toroid to confine a static magnetic field, with production and detection cavities positioned in regions of vanishing external field. We argue that the confining toroid does not significantly screen the axion-induced signal for frequencies of order...
Dark matter could be a thermal relic of strongly-interacting massive particles (SIMPs), where 3→2 self interactions set the relic density. This number-changing process has been shown to be generic in theories of chiral symmetry breaking, where the number-changing processes are sourced by the Wess-Zumino-Witten term. Due to conservation of comoving ...
A nonrelativistic effective field theory for a real Lorentz-scalar axion field $\phi$ is most conveniently formulated in terms of a complex scalar axion field $\psi$. There have been several recent derivations of classical effective Lagrangians for the complex field $\psi$ in which the effective potential was determined to order $(\psi^* \psi)^3$ for specific interaction potentials $V(\phi)$....
