Vector Dark Matter Detection using the Quantum Jump of Atoms

Understand

The hidden sector U(1) vector bosons created from inflationary fluctuations can be a substantial fraction of dark matter if their mass is around $10^{-5}$eV.

• The creation mechanism makes the vector bosons' energy spectral density $\rho_{cdm}/\Delta E$ very high.
• Therefore, the dark electric dipole transition rate in atoms is boosted if the energy gap between atomic states equals the mass of the vector bosons.
• By using the Zeeman effect, the energy gap between the 2S state and the 2P state in hydrogen atoms or hydrogen like ions can be tuned.