Kavli Affiliate: Yevgeny V. Stadnik
| First 5 Authors: Joshua Eby, Satoshi Shirai, Yevgeny V. Stadnik, Volodymyr Takhistov,
| Summary:
Axions constituting dark matter (DM) are often considered to form a
non-relativistic oscillating field. We explore bursts of relativistic axions
from transient astrophysical sources, such as axion star explosions, where the
sources are initially non-relativistic. For the QCD axion, bursts from
collapsing axion stars lead to potentially detectable signals over a wide range
of axion masses $10^{-15} , textrm{eV} lesssim m lesssim 10^{-7} ,
textrm{eV}$ in future experiments, such as ABRACADABRA, DMRadio and SHAFT.
Unlike conventional cold axion DM searches, the sensitivity to axion bursts is
not necessarily suppressed as $1/f$ for large decay constants $f$. The
detection of axion bursts could provide new insights into the fundamental axion
potential, which is challenging to probe otherwise. An ensemble of bursts in
the distant past, in direct analogy with neutrinos, would give rise to a
diffuse axion background distinct from the usual cold axion DM. Coincidence
with other signatures, such as electromagnetic and gravitational-wave emission,
would provide a new beyond-the-standard-model window into multi-messenger
astronomy.
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