Zobrazeno 1 - 10
of 253
pro vyhledávání: '"Safdi, Benjamin"'
It has long been established that axions could have been produced through the Primakoff process within the nascent proto-neutron-star formed following the type II supernova SN1987A, escaped the star due to their weak interactions, and then converted
Externí odkaz:
http://arxiv.org/abs/2405.19393
Thermal higgsino dark matter (DM), with a mass near 1.1 TeV, is one of the most well-motivated and untested DM candidates. Leveraging recent hydrodynamic cosmological simulations that give DM density profiles in Milky Way analogue galaxies we show th
Externí odkaz:
http://arxiv.org/abs/2405.13104
Autor:
Ning, Orion, Safdi, Benjamin R.
We perform the most sensitive search to-date for the existence of ultralight axions using data from the NuSTAR telescope. We search for stellar axion production in the M82 starburst galaxy and the M87 central galaxy of the Virgo cluster and then the
Externí odkaz:
http://arxiv.org/abs/2404.14476
Electromagnetic fields surrounding pulsars may source coherent ultralight axion signals at the known rotational frequencies of the neutron stars, which can be detected by laboratory experiments (e.g., pulsarscopes). As a promising case study, we mode
Externí odkaz:
http://arxiv.org/abs/2402.17820
The quantum chromodynamics (QCD) axion may solve the strong CP problem and explain the dark matter (DM) abundance of our Universe. The axion was originally proposed to arise as the pseudo-Nambu Goldstone boson of global $\mathrm{U}(1)_{\rm PQ}$ Pecce
Externí odkaz:
http://arxiv.org/abs/2312.08425
The 3.5 keV line is a purported emission line observed in galaxies, galaxy clusters, and the Milky Way whose origin is inconsistent with known atomic transitions and has previously been suggested to arise from dark matter decay. We systematically re-
Externí odkaz:
http://arxiv.org/abs/2309.03254
Axion strings are horizon-size topological defects that may be produced in the early Universe. Ultra-light axion-like particles may form strings that persist to temperatures below that of big bang nucleosynthesis. Such strings have been considered pr
Externí odkaz:
http://arxiv.org/abs/2308.01334
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 for narrow X-ray lines arising from DM decays. Unfortunately, the satellite was
Externí odkaz:
http://arxiv.org/abs/2305.17160
Autor:
Safdi, Benjamin R.
These lecture notes on the particle physics and astrophysics of dark matter (DM) were delivered at TASI 2022 ``Ten Years After the Higgs Discovery: Particle Physics Now and Future." The focus of these lecture notes, aimed at the level of advanced gra
Externí odkaz:
http://arxiv.org/abs/2303.02169
Dark matter (DM) in the Milky Way halo may annihilate or decay to photons, producing monochromatic gamma rays. We search for DM-induced spectral lines using 14 years of data from the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope ($
Externí odkaz:
http://arxiv.org/abs/2212.07435