A5063340574- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Particle physics theoretical and experimental studies
- Galaxies: Formation, Evolution, Phenomena
- CCD and CMOS Imaging Sensors
- Astronomy and Astrophysical Research
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
Lawrence Berkeley National Laboratory
2024
University of California, Berkeley
2024
We perform the most sensitive search to-date for existence of ultralight axions using data from NuSTAR telescope. stellar axion production in M82 starburst galaxy and M87 central Virgo cluster then subsequent conversion into hard X-rays surrounding magnetic fields. sum over full populations these galaxies when computing luminosity, we account to photons by field profiles simulated IllustrisTNG analogue galaxies. show that analyzing towards targets between roughly 30 70 keV shows no evidence...
The Hitomi x-ray satellite mission carried unique high-resolution spectrometers that were set to revolutionize the search for sterile neutrino dark matter (DM) by looking narrow lines arising from DM decays. Unfortunately, was lost shortly after launch, and date only analysis using decay used data taken towards Perseus cluster. In this work we present a significantly more sensitive an of archival blank sky locations, searching decaying in our own Milky Way. recently launched XRISM has nearly...
An observation of Charged Lepton Flavor Violation (CLFV) would be unambiguous evidence for physics beyond the Standard Model. The Mu2e and COMET experiments, under construction, are designed to push sensitivity CLFV in mu e conversion process unprecedented levels. Whether is observed or not, there a strong case made further improving sensitivity, examining on additional target materials. Mu2e-II proposed upgrade Mu2e, with at least an order magnitude rate over Mu2e. approach challenges this...
The Hitomi X-ray satellite mission carried unique high-resolution spectrometers that were set to revolutionize the search for sterile neutrino dark matter (DM) by looking narrow lines arising from DM decays. Unfortunately, was lost shortly after launch, and to-date only analysis using decay used data taken towards Perseus cluster. In this work we present a significantly more sensitive an of archival blank sky locations, searching decaying in our own Milky Way. soon-to-be-launched XRISM will...
Low mass axion-like particles could be produced in abundance within the cores of hot, compact magnetic white dwarf (MWD) stars from electron bremsstrahlung and converted to detectable X-rays strong fields surrounding these systems. In this work, we constrain existence such axions two dedicated Chandra X-ray observations $\sim$40 ks each energy range $\sim$1 - 10 keV towards dwarfs (MWDs) WD 1859+148 PG 0945+246. We find no evidence for axions, which constrains axion-electron times...