Speaker
Description
We investigate the effect of photon-axionlike particle (ALP) oscillations in the gamma-ray spectra of fourth most distant blazar QSO B1420+326 measured by Fermi-LAT and MAGIC around the flaring activity in January 2020. We set 95% CL upper limit on the photon-ALP coupling constant $g_{a\gamma} < 2 \times 10^{-11}$ GeV$^{-1}$ for ALP masses $m_{a} \sim 10^{-10} - 10^{-9}$ eV. Assuming the hadronic origin of very-high-energy photons, we also estimate the expected neutrino flux and the cumulative flux from QSO B1420+326-like FSRQs at sub-PeV energies. Furthermore, we study the implications of photon-ALP oscillations on the counterpart gamma-rays of the sub-PeV neutrinos. Finally, we investigate a viable scenario of invisible neutrino decay to ALPs on the gamma-ray spectra and diffuse-ray flux at sub-PeV energies. Interestingly, we find that for the choice of neutrino lifetime $\tau_2/m_2 = 10^{3}$ s eV$^{-1}$, the gamma-ray flux has a good observational sensitivity towards LHAASO-KM2A.
| Alternate track | 09. Dark Matter Detection |
|---|---|
| I read the instructions above | Yes |
