6 papers
Electroweak right-handed neutrino portal dark matter
Wan-Zhe Feng, Ao Li, Zong-Huan Ye +1
We study dark matter coupled to the Standard Model via electroweak scale right-handed neutrinos in a Type-I seesaw framework. We consider a minimal dark sector containing a fermion…
Supercool with PPO: Exploring Supercooled Phase Transitions via Reinforcement Learning
Wan-Zhe Feng, Zong-Huan Ye, Zi-Hui Zhang
Gravitational waves from cosmological first-order phase transitions provide a powerful probe of hidden sectors and beyond the Standard Model physics. However, identifying phenomeno…
Annihilating to the Darker: Thermal Relic Dark Matter with an Ultraweak Portal to the Standard Model
Wan-Zhe Feng, Zi-Hui Zhang
Thermal relic dark matter has been severely constrained in recent years by direct and indirect dark matter searches, as well as multi-messenger probes of dark sectors. At the curre…
Gauge-independent gravitational waves from a minimal dark sector with viable dark matter candidates
Wan-Zhe Feng, Zi-Hui Zhang
Searches for stochastic gravitational wave backgrounds generated by first-order phase transitions offer a powerful probe of hidden sectors, but quantitative predictions in gauge th…
Darker matter generating from the dark
Wan-Zhe Feng, Zi-Hui Zhang
The non-detection of dark matter may be attributed to the dark matter residing in a darker hidden sector. We explore the possibility that a hidden sector produced through the freez…
Sub-GeV millicharge dark matter from the hidden sector
Wan-Zhe Feng, Zi-Hui Zhang, Kai-Yu Zhang
We conduct a comprehensive study on the sub-GeV millicharge dark matter produced through the freeze-in mechanism. We discuss in general the mixing mechanism, encompassing both kine…