6 papers
Exploring the Cosmic Dawn through the 21 cm Forest and High-redshift Radio Sources with the SKA
Junsong Cang, Benedetta Ciardi, Barun Maity +12
The 21~cm forest, seen as absorption features in the spectra of distant radio sources, is produced by intervening neutral hydrogen and offers a direct probe of the neutral intergal…
Signatures of inhomogeneous dark matter annihilation on 21-cm
Junsong Cang, Yu Gao, Yin-Zhe Ma
The energy released from dark matter (DM) annihilation leads to additional ionization and heating of the intergalactic gas, impacting the hydrogen 21-cm signal during the cosmic da…
Sensitivity of the Hongmeng 21cm experiment to scattering dark matter
Junsong Cang, Yu Gao, Yin-Zhe Ma
Scattering between dark matter and baryons can cool the intergalactic medium temperature and deepen the 21cm signal. Such interactions have been proposed to explain the unusually d…
Investigating Primordial Black Hole Accretion through Cosmic Optical Depth
Zi-Xuan Zhang, Junsong Cang, Yu Gao +1
Primordial black holes (PBH) accretion in the late Universe can lead to significant mass growth. A larger mass further accelerates the accretion radiation output for PBHs with init…
Implications of Pulsar Timing Array Results for High Frequency Gravitational Waves
Junsong Cang, Yu Gao, Yiming Liu +1
Several pulsar timing array (PTA) experiments such as NANOGrav and PPTA recently reported evidence of a gravitational wave (GW) background at nano-Hz frequency band. This signal ca…
The EDGES measurement disfavors an excess radio background during the cosmic dawn
Junsong Cang, Andrei Mesinger, Steven G. Murray +3
In 2018 the EDGES experiment claimed the first detection of the global cosmic 21cm signal, which featured an absorption trough centered around with a depth of approxima…