PT Journal
AU Caputo, A
   Liu, HW
   Mishra-Sharma, S
   Pospelov, M
   Ruderman, JT
   Urbano, A
TI Edges and Endpoints in 21-cm Observations from Resonant Photon Production
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2021
BP 011102
EP 7pp
VL 127
IS 1
DI 10.1103/PhysRevLett.127.011102
LA English
AB We introduce a novel class of signatures-spectral edges and end points-in 21-cm measurements resulting from interactions between the standard and dark sectors. Within the context of a kinetically mixed dark photon, we demonstrate how resonant dark photon-to-photon conversions can imprint distinctive spectral features in the observed 21-cm brightness temperature, with implications for current, upcoming, and proposed experiments targeting the cosmic dawn and the dark ages. These signatures open up a qualitatively new way to look for physics beyond the Standard Model using 21-cm observations.
ER