Search for post-inflationary QCD axions with a quantum-limited tunable microwave receiver

Abstract

A search for cosmological axions has been performed by scanning a frequency region of $38$MHz centered at about $10.2$GHz, corresponding to an axion mass $m_a\simeq 42\mu$eV. The QUAX experimental apparatus, a haloscope comprised of a 1-liter volume tunable cavity immersed in an $8$T magnetic field and a quantum-limited detection chain, set limits on the axion-photon coupling at the $10^{-14}$GeV${}^{-1}$ level. As no signal candidate has been observed, viable hadronic axion models are ruled out in a currently preferred post-inflationary region $m_a>40\mu$eV.

arXiv comment5 pages, 4 figures

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