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21. Search for topological defect dark matter with a global network of optical magnetometers (GNOME)Daniel Gavilán Martín (Helmhotz-Institut Mainz, Johannes Gutenberg Universität Mainz)05/07/2023, 14:00
Ultralight axion-like particles are well-motivated dark matter candidates which can feature topological defects. If Earth encounters such structures, a global pattern of transient signals would be detectable with terrestrial experiments. Here, we report the analysis of three months of data from the Global Network of Optical Magnetometers for Exotic physics searches (GNOME). The data collected...
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Maria Ramos05/07/2023, 14:30
We demonstrate that the true QCD axion that solves the strong CP problem can be found in all generality outside the customary standard QCD band, with QCD being the sole source of Peccei-Quinn breaking. The essential reason is that the basis of axion-gluon interactions does not need to coincide with the mass basis, namely the QCD axion can mix with other scalar fields in Nature. We determine in...
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Maria Simanovskaia (Stanford University)05/07/2023, 14:50
The axion is one of the most compelling dark matter (DM) candidates and a solution to the strong charge-parity problem. DMRadio-50L is a resonant lumped-element detector with a toroidal magnet searching for axions in the range 5 kHz - 5 MHz (20 peV - 20 neV) with a target sensitivity to axion-photon-photon coupling $5 \times 10^{-15}$ GeV$^{-1}$. DMRadio-50L also acts as an innovation platform...
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Konstantin Springmann (TU Munich)05/07/2023, 15:10
Lighter than expected QCD axions can get destabilized in sufficiently dense and large objects such as white dwarfs and neutron stars. Once the axion is sourced the mass of nucleons within the star is reduced, leading to a new ground state of nuclear matter. I will show that white dwarfs in this absolutely stable phase would look very different from what is observed, allowing to set novel and...
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Tatsumi Nitta (The University of Tokyo)05/07/2023, 15:30
The Cosmic axion Background (CaB), a relativistic background of axions that is not dark matter, could be produced in the late Universe from the decay of another dark matter candidate.
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In this talk, we show the first result of the direct search for CaB performed with the axion haloscope, the Axion Dark Matter eXperiment.
Conventional haloscope analyses search for a signal with a narrow... -
Mr Samuel S. Y. Wong (Stanford University)
Dark photon dark matter in the milli-eV mass range is notoriously difficult to detect, being too high in frequency for high-Q cavity resonators yet below the energy threshold of single-photon detectors. I will present a new method that overcomes this difficulty, based on recent work (arXiv:2208.06519) with Peter Graham and Gerald Gabrielse et al. We propose to use trapped electrons as high-Q...
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Sungwoo Youn
Significant experimental efforts to search for QCD axions have been made at the Center for Axion and Precision Physics Research (CAPP) in order to address the fundamental questions in physics: the strong CP problem and the dark matter mystery. The Center has established a world-class facility dedicated for cavity haloscope searches relying on the axion-photon coupling. By leveraging powerful...
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