@article{a600c5e873ef4085bc4466562abb7289,
title = "Search for a Dark-Matter-Induced Cosmic Axion Background with ADMX",
abstract = "We report the first result of a direct search for a cosmic axion background (CaB) - a relativistic background of axions that is not dark matter - performed with the axion haloscope, the Axion Dark Matter eXperiment (ADMX). Conventional haloscope analyses search for a signal with a narrow bandwidth, as predicted for dark matter, whereas the CaB will be broad. We introduce a novel analysis strategy, which searches for a CaB induced daily modulation in the power measured by the haloscope. Using this, we repurpose data collected to search for dark matter to set a limit on the axion photon coupling of a CaB originating from dark matter cascade decay via a mediator in the 800-995 MHz frequency range. We find that the present sensitivity is limited by fluctuations in the cavity readout as the instrument scans across dark matter masses. Nevertheless, we suggest that these challenges can be surmounted using superconducting qubits as single photon counters, and allow ADMX to operate as a telescope searching for axions emerging from the decay of dark matter. The daily modulation analysis technique we introduce can be deployed for various broadband rf signals, such as other forms of a CaB or even high-frequency gravitational waves.",
author = "T. Nitta and T. Braine and N. Du and M. Guzzetti and C. Hanretty and G. Leum and Rosenberg, {L. J.} and G. Rybka and J. Sinnis and John Clarke and I. Siddiqi and Awida, {M. H.} and Chou, {A. S.} and M. Hollister and S. Knirck and A. Sonnenschein and W. Wester and Gleason, {J. R.} and Hipp, {A. T.} and P. Sikivie and Sullivan, {N. S.} and Tanner, {D. B.} and R. Khatiwada and G. Carosi and N. Robertson and Duffy, {L. D.} and C. Boutan and E. Lentz and Oblath, {N. S.} and Taubman, {M. S.} and J. Yang and Daw, {E. J.} and Perry, {M. G.} and C. Bartram and Buckley, {J. H.} and C. Gaikwad and J. Hoffman and Murch, {K. W.} and M. Goryachev and E. Hartman and McAllister, {B. T.} and A. Quiskamp and C. Thomson and Tobar, {M. E.} and Dror, {J. A.} and H. Murayama and Rodd, {N. L.}",
note = "Funding Information: The work presented benefited from discussions with members of the HAYSTAC Collaboration, in particular, Maryam H. Esmat, Sumita Ghosh, Alexander F. Leder, and Danielle Speller. This work was supported by the U.S. Department of Energy through Grants No. DE-SC0009800, No. DESC0009723, No. DE-SC0010296, No. DE-SC0010280, No. DE-SC0011665, No. DEFG02-97ER41029, No. DEFG02-96ER40956, No. DEC03-76SF00098, and No. DE-SC0017987. Fermilab is a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. Additional support was provided by the Heising-Simons Foundation and by the Lawrence Livermore National Laboratory LDRD office. Pacific Northwest National Laboratory is a multiprogram national laboratory operated for the U.S. DOE by Battelle Memorial Institute under Contract No. DE-AC05-76RL01830. Prepared in part by LLNL under Contract No. DE-AC52-07NA27344, Release No. LLNL-JRNL-845987”. T. N. is supported by JSPS Overseas Research Fellowships No. 202060305. C. Bartram acknowledges support from the Panofsky Fellowship at SLAC. Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society.",
year = "2023",
month = sep,
day = "8",
doi = "10.1103/PhysRevLett.131.101002",
language = "English",
volume = "131",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "10",
}