75 citations · 172 across the 19 of their papers we have counts for
5 papers · 1 filter
Axion limits from the 10-year gamma-ray emission 1ES 1215+303
Hai-Jun Li, Wei Chao, Yu-Feng Zhou
We present the limits on photon to axionlike particle (ALP) coupling from the 10-year period observations of the TeV BL Lacertae blazar 1ES 1215+303 (with redshift ). The…
Light QCD Axion Dark Matter from Double Level Crossings
Hai-Jun Li, Ying-Quan Peng, Wei Chao +1
The even light QCD axion called the axion can both solve the strong CP problem and account for the dark matter (DM). We point out that the single and double level…
Axion dark matter with explicit Peccei-Quinn symmetry breaking in the axiverse
Hai-Jun Li
It was shown that the required high quality of the Peccei-Quinn (PQ) symmetry can be a natural outcome of the multiple QCD axions model. In the axiverse, a hypothetical mass mixing…
Supermassive black holes triggered by QCD axion bubbles
Hai-Jun Li, Ying-Quan Peng, Wei Chao +1
The supermassive black holes (SMBHs) are ubiquitous in the center of galaxies, although the origin of their massive seeds is still unknown. In this paper, we investigate the SMBHs…
QCD axion bubbles in the presence of ALP resonant conversion
Hai-Jun Li
The QCD axion bubbles can form due to an explicit breaking of the Peccei-Quinn symmetry in the early Universe. In this paper, we investigate the modified formation of QCD axion bub…