Multimessenger Astronomy Beyond the Standard Model: New Window from Quantum Sensors

Ultralight bosonic fields (ULBs) are ubiquitous in theories beyond the standard model. If these ULBs exist, violent events that emit gravitational wave (GW), electromagnetic (EM), or neutrino ($\nu$) signals may also emit coincident relativistic and high-density bursts of the ULBs. These could be detected here on Earth as a transient event and correlated with the standard model (SM) signals, providing a new avenue in multimessenger astronomy. We study this scenario with ultralight scalar and pseudoscalar fields whose couplings to the SM can be detected by quantum sensors. Since the ULBs are massive, there can be significant time delay between the ULB and SM signals, due to either the emission spectrum, or backaction effects with ordinary matter. We show a new paradigm of multimessenger astronomy with ULBs is possible from a detection standpoint, while taking into account many complementary and competing effects.