3 papers
astro-ph.HE2026
Unveiling Hidden Clustering: An Unsupervised Machine Learning Study of Repeating FRB 20220912A
An-Chieh Hsu, Tetsuya Hashimoto, Tomotsugu Goto +2
Fast Radio Bursts (FRBs) are millisecond-duration radio transients of extragalactic origin. Classifying repeating FRBs is essential for understanding their emission mechanisms, but…
astro-ph.HE2026
Spectral Shapes of Pair Annihilation Line Emission in Magnetar Giant Flares
Tomoki Wada, Shigeo S. Kimura
We investigate the gamma-ray spectrum in the MeV range arising from electron-positron pair annihilation in fireballs associated with magnetar giant flares (MGFs), motivated by the…
astro-ph.HE2025
Vacuum Polarization Effects in Baryon-Loaded Magnetar Bursts and Implications for X-ray Polarization
Tomoki Wada
Magnetars provide natural laboratories for strong-field quantum electrodynamics processes, such as vacuum polarization, which gives rise to vacuum resonance together with the plasm…