125973 20241125101137.0 doi 10.1103/PhysRevD.107.083510 sideral 133522 ART-2023-133522 eng Eggemeier, B. Axion minivoids and implications for direct detection 2023 Access copy available to the general public Unrestricted In the scenario in which QCD axion dark matter is produced after inflation, the Universe is populated by large inhomogeneities on very small scales. Eventually, these fluctuations will collapse gravitationally to form dense axion miniclusters that trap up to ∼75% of the dark matter within asteroid-mass clumps. Axion miniclusters are physically tiny however, so haloscope experiments searching for axions directly on Earth are much more likely to be probing “minivoids”—the space in between miniclusters. This scenario seems like it ought to spell doom for haloscopes, but while these minivoids might be underdense, they are not totally devoid of axions. Using Schrödinger-Poisson and N-body simulations to evolve from realistic initial field configurations, we quantify the extent to which the local ambient dark matter density is suppressed in the postinflationary scenario. We find that a typical experimental measurement will sample an axion density that is only around 10% of the expected galactic dark matter density. Our results are taken as conservative estimates and have implications for experimental campaigns lasting longer than a few years, as well as broadband haloscopes that have sensitivity to transient signatures. We show that for a Oð(year)-long integration times, the measured dark matter density should be expected to vary by 20%–30%. info:eu-repo/grantAgreement/ES/AEI-FEDER/PGC2018-095328-B-I00 info:eu-repo/grantAgreement/ES/DGA/E12-7R info:eu-repo/grantAgreement/EC/H2020/674896/EU/The Elusives Enterprise: Asymmetries of the Invisible Universe/ELUSIVES This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 674896-ELUSIVES info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 4.6 2023 PHYSICS, PARTICLES & FIELDS 7 / 31 = 0.226 2023 Q1 T1 ASTRONOMY & ASTROPHYSICS 17 / 84 = 0.202 2023 Q1 T1 1.587 2023 Physics and Astronomy (miscellaneous) 2023 Q1 Nuclear and High Energy Physics 2023 Q1 9.3 2023 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion O’Hare, C. A. J. Pierobon, G. Redondo, J. Universidad de Zaragoza (orcid)0000-0002-1044-8197 Wong, Y. Y. Y. 2004 405 Universidad de Zaragoza Dpto. Física Teórica Área Física Teórica 107, 8 (2023), 083510 [18 pp.] Phys. rev. D Physical Review D 2470-0010 2376309 http://zaguan.unizar.es/record/125973/files/texto_completo.pdf Versión publicada 2850003 http://zaguan.unizar.es/record/125973/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:125973 articulos driver 2024-11-22-12:01:19 ARTICLE