4 papers
Neutrino lines and photon continua from cascade dark matter decay
Jun Guo, Shi-ying Zhao, Bin Zhu
We investigate the two-body decay of fermionic dark matter, , where the light mediator subsequently decays into photons. We consider two benchmark model…
A MeV-Scale Dark QCD Solution to the Axion Domain Wall Problem
Jun Guo, Zhaofeng Kang, Jiang Zhu
PQ solution to the strong CP problem probably encounters the axion domain wall problem. In this article, we propose a simple and testable solution, assuming that the $U(1)_{\rm PQ}…
Probing Ultralight Primordial Black Hole Dark Matter with XMM Telescopes
Jun Guo, Qiang Yuan, Bin Zhu
Primordial black holes (PBHs), originating from the gravitational collapse of large overdensities in the early Universe, emerge as a compelling dark matter (DM) candidate across a…
Gamma-ray Signal from Dark Matter-Companion Models
Jun Guo, Zhaofeng Kang, Ji-Gang Zhao
In Ref.~\cite{Guo:2021rre}, we proposed to replace the final dark matter (DM) particle in the semi-annihilation mode with its compan…