75 citations · 172 across the 19 of their papers we have counts for
21 papers
Completing Axion Double Level Crossings
Hai-Jun Li, Wei Chao, Huai-Ke Guo +1
In this work, we present the refinement of axion double level crossings within the context of multi-axion mass mixing, specifically focusing on cases where the number of axions exc…
Axion Mixing in the String Axiverse
Hai-Jun Li, Yu-Feng Zhou
String axiverse provides a fascinating and complex landscape for axion physics. The requirement in type IIB string axiverse models necessitates at least two axions to ensure the pr…
QCD Axion Dark Matter in the Dark Dimension
Hai-Jun Li
The recently proposed dark dimension scenario reveals that axions can be localized on the Standard Model brane, thereby predicting the quantum chromodynamics (QCD) axion decay cons…
Axion effects on gamma-ray spectral irregularities. II: Implications of EBL absorption
Hai-Jun Li, Wei Chao, Xiu-Hui Tan +1
The extragalactic background light (EBL) plays a crucial role in the propagation of high-energy particles throughout the Universe. In this work, we explore the impact of the EBL ab…
On the Temperature Effects in QCD Axion Mass Mixing
Hai-Jun Li
In this work, we extend the QCD axion mass mixing in the early Universe and investigate the temperature effects in the mixing. We explore the scenario where two QC…
Mass Mixing between QCD Axions
Hai-Jun Li, Yu-Feng Zhou
We introduce a novel level crossing phenomenon in the mass mixing between the QCD axions, one canonical QCD axion and one axion. The level crossing can take place…
Upper limit on the axion-photon coupling from Markarian 421
Hai-Jun Li, Wei Chao, Yu-Feng Zhou
Markarian 421 is a well-known nearby BL Lac blazar at the redshift . Many previous works were investigated to constrain the axion-photon coupling from its TeV gamma-ray ob…
Gravitational waves and primordial black holes from axion domain walls in level crossing
Hai-Jun Li, Yu-Feng Zhou
In this paper, we investigate the nano-Hertz gravitational waves (GWs) emission and the massive primordial black holes (PBHs) formation from the light QCD axion scenario. We consid…
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…
Axion effects on gamma-ray spectral irregularities with AGN redshift uncertainty
Hai-Jun Li, Wei Chao
We investigate the photon-axionlike particle (ALP) oscillation effects on TeV gamma-ray spectral irregularities from the uncertain redshift active galactic nuclei (AGN) VER J0521+2…
Axion-like Dark Matter from the Type-II Seesaw Mechanism
Wei Chao, Mingjie Jin, Hai-Jun Li +1
Although axion-like particles (ALPs) are popular dark matter candidates, their mass generation mechanisms as well as cosmic thermal evolutions are still unclear. In this letter, we…
Primordial black holes induced stochastic axion-photon oscillations in primordial magnetic field
Hai-Jun Li
Primordial black holes (PBHs) can be produced in the very early Universe due to the large density fluctuations. The cosmic background of axion-like particles (ALPs) could be non-th…
Probing photon-ALP oscillations from the flat spectrum radio quasar 4C+21.35
Hai-Jun Li
Flat spectrum radio quasar (FSRQ) is the most luminous blazar at the GeV energies. In this paper, we probe the photon-axion-like particle (ALP) oscillation effect on the latest ver…
Relevance of VHE Blazar Spectra Models with Axion-Like Particles
Hai-Jun Li
The oscillation of photons and axion-like particles (ALPs) in the astrophysical magnetic fields could modify the measured very high energy (VHE; )…
Searching for Axion-Like Particles with the Blazar Observations of MAGIC and Fermi-LAT
Hai-Jun Li, Xiao-Jun Bi, Peng-Fei Yin
We explore the axion-like particle (ALP)-photon oscillation effect in the -ray spectra of the blazars Markarian 421 (Mrk 421) and PG 1553+113, which are measured by the Major At…
Limits on axion-like particles from Mrk 421 with 4.5-year period observations by ARGO-YBJ and Fermi-LAT
Hai-Jun Li, Jun-Guang Guo, Xiao-Jun Bi +2
In this work, we investigate the axion-like particle (ALP)-photon oscillation effect in the spectra of the blazar Markarian 421 (Mrk 421) using 4.5 years of the Astrophysical Radia…
The implications of the axion like particle from the Fermi-LAT and H.E.S.S. observations of PG 1553+113 and PKS 2155-304
Junguang Guo, Hai-Jun Li, Xiao-Jun Bi +2
We investigate the axion like particle (ALP)-photon oscillation effect in the high energy -ray spectra of PG 1553+113 and PKS 2155-304 measured by Fermi-LAT and H.E.S.S.. The ch…