3 papers
astro-ph.HE2026
Microquasar Cygnus X-3 as the PeVatron powering the Cygnus Bubble
Zhaodong Shi, Guangwei Wang, Ruizhi Yang +1
The recent discovery by the LHAASO collaboration of a variable ultra-high-energy (UHE; 100 TeV) -ray source associated with the microquasar Cygnus X-3, with a spectru…
astro-ph.HE2025
A Giant Peanut-shaped Ultra-High-Energy Gamma-Ray Emitter Off the Galactic Plane
Zhen Cao, Felix Aharonian, Yunxiang Bai +312
Ultra-high-energy (UHE), exceeding 100 TeV (10^12 electronvolts), γ-rays manifests extreme particle acceleration in astrophysical sources. Recent observations by γ-ray telescopes…
math.LO2025
Satisfaction is not absolute
Joel David Hamkins, Ruizhi Yang
We prove that the satisfaction relation of first-order logic is not absolute between models of set theory having the structure and the…