3 papers
astro-ph.HE2026
Images of shadow and thin accretion disk around Bardeen black hole surrounded by perfect fluid dark matter
Haiyuan Feng, Ziqiang Cai, Hao-Peng Yan +2
We investigate the shadow and optical appearance of Bardeen black hole (BH) immersed in perfect fluid dark matter (PFDM). Using EHT observations of M87* and Sgr A*, we constrain th…
gr-qc2026
Shadow of rotating black hole surrounded by dark matter
Haiyuan Feng, Ziqiang Cai, Rong-Jia Yang +1
Dark matter (DM), a fundamental cosmic component, motivates the study of its influence on black hole (BH) shadows, especially for spinning BHs confirmed by EHT observations. This w…
hep-th2026
Newtonian potential from scattering amplitudes in super-renormalizable gravity
Haiyuan Feng, Rong-Jia Yang, Jinjun Zhang
Based on the classical limit of relativistic scattering amplitudes, we compute the coupling between a general super-renormalizable gravity and massive scalar particles. This allows…