Modulation sensitive search for nonvirialized dark-matter axions
- Univ. of Florida, Gainesville, FL (United States)
- Univ. of Washington, Seattle, WA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- National Radio Astronomy Observatory, Charlottesville, VA (United States)
- Univ. of California, Berkeley, CA (United States)
- Univ. of Sheffield (United Kingdom)
Nonvirialized dark-matter axions may be present in the Milky Way halo in the form of low-velocity-dispersion flows. In this paper, the Axion Dark-Matter eXperiment performed a search for the conversion of these axions into microwave photons using a resonant cavity immersed in a strong, static magnetic field. The spread of photon energy in these measurements was measured at spectral resolutions of the order of 1 Hz and below. If the energy variation were this small, the frequency modulation of any real axion signal due to the orbital and rotational motion of Earth would become non-negligible. Conservative estimates of the expected signal modulation were made and used as a guide for the search procedure. The photon frequencies covered by this search are 812–852 and 858–892 MHz, which correspond to an axion mass of 3.36–3.52 and . Finally, no axion signal was found, and limits were placed on the maximum local density of nonvirialized axions of these masses.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Florida, Gainesville, FL (United States); Univ. of Washington, Seattle, WA (United States); Univ. of California, Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); LLNL Laboratory Directed Research and Development (LDRD) Program; Heising-Simons Foundation (United States)
- Grant/Contract Number:
- AC52-07NA27344; AC03-76SF00098; SC0010280; FG02-97ER41029; FG02-96ER40956
- OSTI ID:
- 1458689
- Alternate ID(s):
- OSTI ID: 1328594
- Report Number(s):
- LLNL-JRNL-737372; 890319; TRN: US1901508
- Journal Information:
- Physical Review D, Vol. 94, Issue 8; ISSN 2470-0010
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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