AGILE archival data reveal gamma-ray flares from a source matching IGR J17354-3255, with orbital phase correlation supporting physical association and high-energy emission from SFXTs.
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Simulations predict time-dependent gamma-ray lines from r-process and iron-peak decays in accretion-induced white dwarf collapse, detectable to ~10 Mpc and absent in neutron star mergers.
Turbulent electron-ion coronae around accreting black holes self-regulate into a two-temperature state that generates nonthermal ions and X-ray spectra consistent with observations including an MeV tail.
Symmetry-informed neural networks using SU(3)/SU(4) Casimir operators achieve lower RMSE on global nuclear masses than liquid-drop models, with WINN reaching 0.430 MeV validation error and showing dripline and superheavy patterns.
Relativistic outflows in accretion-induced collapse of white dwarfs are modeled as sources of UHECRs, contributing a few 10^43-10^45 erg Mpc^{-3} yr^{-1} assuming iron-like nuclei and sufficient event rates.
The cosmologically integrated neutrino emission from supermassive black hole coronae in Seyfert galaxies can account for the sub-PeV diffuse extragalactic neutrino flux observed by IceCube.
Revised supernova opacity modeling reopens the Turner window for hadronically coupled axions, enabling resonant absorption searches in NaI detectors for couplings |g_app| between 10^{-6.5} and 10^{-2}.
A neural network outputs HEALPix probability distributions from COSI BGO shield counts to localize short GRBs and compute possibly multi-modal 90% confidence regions.
Six s-wave proton resonances in 19Ne were identified via angular distributions in the 19F(3He,t)19Ne reaction, with asymptotic normalizations computed in the symmetry-adapted no-core shell model, showing that prior studies underestimated uncertainties in the 18F(p,α)15O rate.
Calculations indicate low probabilities (up to 11% for 89Sr, 5% for 22Na) of COSI detecting gamma-ray lines from i-process isotopes in nearby post-AGB stars or white dwarfs.
A balloon mission concept with 8192 TES detectors projects 200 eV FWHM resolution at 511 keV and 35-sigma detection of the galactic center 511 keV line to study its shape and substructure.
Gamma-ray observations impose an upper bound of order 1 GeV on the mass of a photon-coupled scalar dark matter candidate produced via thermal misalignment.
Projects COSI and AMEGO-X sensitivities to sub-GeV DM in vector-scalar portals, finding COSI leading in some regions beyond CMB limits and AMEGO-X covering most continuum cases.
This work sets new upper limits on decay lifetimes and couplings for axion-like particles, dark photons, scalars, and B-L or L_i-L_j vector bosons using 511 keV line, X-ray continuum, and cosmic-ray flux observations.
In the minimal Majoron model the particle can explain all dark matter with mass below about 10 MeV from misalignment or freeze-in, and remains compatible with thermal leptogenesis when misalignment dominates or with mild tuning.
Estimates based on 17 years of Fermi LAT data indicate COSI may detect MeV polarization in a small number of blazar flares, with flat-spectrum radio quasars as the top targets.
Solar axion-like particles up to 5.5 MeV produce off-axis MeV photons via two-body decay, enabling new space and terrestrial searches that could probe g_aγ down to 10^{-12} GeV^{-1}.
Reviews mechanisms generating polarized X-rays in high-energy astrophysics and the detectors for measuring polarization fraction and angle.
citing papers explorer
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AGILE detection of transient {\gamma}-ray emission from the region of the supergiant fast X-ray transient source IGR J17354-3255
AGILE archival data reveal gamma-ray flares from a source matching IGR J17354-3255, with orbital phase correlation supporting physical association and high-energy emission from SFXTs.
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Gamma-ray Signatures of r-Process Radioactivity from the Collapse of Magnetized White Dwarfs
Simulations predict time-dependent gamma-ray lines from r-process and iron-peak decays in accretion-induced white dwarf collapse, detectable to ~10 Mpc and absent in neutron star mergers.
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High-energy Emission from Turbulent Electron-ion Coronae of Accreting Black Holes
Turbulent electron-ion coronae around accreting black holes self-regulate into a two-temperature state that generates nonthermal ions and X-ray spectra consistent with observations including an MeV tail.
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Bridging Ab Initio Symmetries and Global Nuclear Masses with Interpretable Neural Networks
Symmetry-informed neural networks using SU(3)/SU(4) Casimir operators achieve lower RMSE on global nuclear masses than liquid-drop models, with WINN reaching 0.430 MeV validation error and showing dripline and superheavy patterns.
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Ultra high-energy cosmic rays from relativistic outflows in accretion induced collapse of white dwarfs
Relativistic outflows in accretion-induced collapse of white dwarfs are modeled as sources of UHECRs, contributing a few 10^43-10^45 erg Mpc^{-3} yr^{-1} assuming iron-like nuclei and sufficient event rates.
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Particle Acceleration, Coronal Neutrino Production, and the Diffuse Extragalactic Neutrino Background from Supermassive Black Holes
The cosmologically integrated neutrino emission from supermassive black hole coronae in Seyfert galaxies can account for the sub-PeV diffuse extragalactic neutrino flux observed by IceCube.
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Revisiting Turner Window Axions: The Untapped Potential of NaI Dark Matter Detectors
Revised supernova opacity modeling reopens the Turner window for hadronically coupled axions, enabling resonant absorption searches in NaI detectors for couplings |g_app| between 10^{-6.5} and 10^{-2}.
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Localization and Confidence Region Estimation of Short GRBs with the COSI BGO Shield Using a HEALPix-Based Deep Learning Approach
A neural network outputs HEALPix probability distributions from COSI BGO shield counts to localize short GRBs and compute possibly multi-modal 90% confidence regions.
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Properties of states in \textsuperscript{19}Ne important for the \textsuperscript{18}F$(p,\alpha)$\textsuperscript{15}O reaction rate
Six s-wave proton resonances in 19Ne were identified via angular distributions in the 19F(3He,t)19Ne reaction, with asymptotic normalizations computed in the symmetry-adapted no-core shell model, showing that prior studies underestimated uncertainties in the 18F(p,α)15O rate.
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Can COSI detect $\gamma$-ray lines from rare isotopes produced in the astrophysical intermediate neutron-capture process?
Calculations indicate low probabilities (up to 11% for 89Sr, 5% for 22Na) of COSI detecting gamma-ray lines from i-process isotopes in nearby post-AGB stars or white dwarfs.
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Design of a mission to measure the shape and substructure of the 511 keV gamma-ray line from the center of the Milky Way
A balloon mission concept with 8192 TES detectors projects 200 eV FWHM resolution at 511 keV and 35-sigma detection of the galactic center 511 keV line to study its shape and substructure.
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Gamma-Ray Signatures of Thermal Misalignment Dark Matter
Gamma-ray observations impose an upper bound of order 1 GeV on the mass of a photon-coupled scalar dark matter candidate produced via thermal misalignment.
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Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X
Projects COSI and AMEGO-X sensitivities to sub-GeV DM in vector-scalar portals, finding COSI leading in some regions beyond CMB limits and AMEGO-X covering most continuum cases.
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INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, $B-L$ and $L_{i}-L_{j}$ Vectors
This work sets new upper limits on decay lifetimes and couplings for axion-like particles, dark photons, scalars, and B-L or L_i-L_j vector bosons using 511 keV line, X-ray continuum, and cosmic-ray flux observations.
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Minimal Majoron Dark Matter
In the minimal Majoron model the particle can explain all dark matter with mass below about 10 MeV from misalignment or freeze-in, and remains compatible with thermal leptogenesis when misalignment dominates or with mild tuning.
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Detectability of Polarized Gamma-ray Emission from Blazar Flares with COSI
Estimates based on 17 years of Fermi LAT data indicate COSI may detect MeV polarization in a small number of blazar flares, with flat-spectrum radio quasars as the top targets.
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Looking for Lights from the Darkness: Signals from MeV-scale Solar Axion-like Particles
Solar axion-like particles up to 5.5 MeV produce off-axis MeV photons via two-body decay, enabling new space and terrestrial searches that could probe g_aγ down to 10^{-12} GeV^{-1}.
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Astrophysical X-Ray Polarization
Reviews mechanisms generating polarized X-rays in high-energy astrophysics and the detectors for measuring polarization fraction and angle.