High-energy neutrino astronomy is rapidly evolving: After the discovery of a largely diffuse astrophysical TeV-PeV neutrino flux, the IceCube Neutrino Observatory has more recently found indications of associations between blazar emission and high-energy neutrinos. However, different analyses show that blazars are only expected to make up a subdominant contribution to the total observed...
TXS0506+056 is the first-ever known blazar having coincidence with IceCube neutrino alert 170922A, this source has been observed in multi-wavelengths during different epochs. Multi-wavelengths study of this source during different epochs with electron synchrotron and proton synchrotron using the GAMERA package has been presented.
Tension between the diffuse multimessenger observations of both neutrinos and gamma rays hints that the contribution of gamma-ray bright objects to the observed astrophysical neutrino flux is limited. This initiated the interest in gamma-ray dim objects, obscured by large amounts of dust and gas. In this work we investigate for the first-time ultra-and luminous infrared galaxies (U/LIRGs)...
The IceCube discovery of an astrophysical flux of high-energy neutrinos is a milestone in multi-messenger astronomy. Time-integrated searches for point-like neutrino sources have failed so far because of large backgrounds and weak signals. The IceCube capability of observing the sky with a full duty cycle enables the search for transient neutrino emissions and provides alerts to the community...
The Tibet AS$\gamma$ experiment provided the first measurement of the total diffuse gamma-ray emission from the Galactic disk in the sub-PeV energy range.
This measurement can be used to constrain the cosmic-rays (CRs) space and energy distribution and consequently the gamma-neutrino Galactic diffuse emission, produced by the interaction of CRs with the interstellar medium.
The...
The Jiangmen Underground Neutrino Observatory (JUNO) is a 20$\,$kt multi-purpose experiment under construction in southern China, expecting to begin data taking in 2023. JUNO will detect electron antineutrinos generated from the beta decays of fission products inside nuclear reactors and is located at about 53$\,$km from two nuclear power plants to maximize the effect of neutrino oscillations....
Analyses of neutrino oscillations experiments usually rely on the standard probability formula, which assumes that neutrino wave functions can be approximated by plane waves and neglects any decoherence effect. This expression is valid in most regimes, or at least it is in the three neutrino paradigm.
In this talk, we will re-examine this assumption in the context of sterile neutrino...
Heavy Neutral Leptons (HNLs) are GeV-scale right-handed (sterile) neutrinos which have been posited as a possible explanation for light neutrino masses via the seesaw mechanism. HNL production from tau neutrinos and the HNL's subsequent decay would produce a unique double-bang signature in the IceCube detector, enabling a novel search for GeV-scale HNLs at atmospheric neutrino energies....
Dark matter (DM) particles are predicted to decay into Standard Model particles which would produce signals of neutrinos, gamma-rays, and other secondary particles. Neutrinos provide an avenue to probe astrophysical sources of DM particles. We review the decay of dark matter into neutrinos over a range of dark matter masses from MeV/c2 to ZeV/c2. We examine the expected contributions to the...
Tokai to Kamioka (T2K) is a long-baseline neutrino experiment based in Japan, which has provided some of the strongest constraints for the $\theta_{23}$ and $\delta_{CP}$ parameters of the neutrino mixing matrix. I will discuss the role of remparameterisations of the phase space of the Pontecorvo-Maki-Nakagawa-Sakata matrix in testing the robustness of T2K's Bayesian analysis framework MaCh3,...
Supernova Remnants have long been considered as promising candidate sources for cosmic rays. However, modelling the transport around these sources is difficult due to its nonlinear nature. The strong overdensity in the near source region leads to the production of plasma turbulence, upon which the particles scatter. To calculate this mechanism, called self-confinement, requires the numerical...
Due to neutrino-neutrino forward scattering, the neutrino flavor conversion inside a supernova is still an open question. This type of interaction leads to a non-linear evolution of neutrino states and is strongly dependent on their angular distribution. Thus, the peculiarities of the supernovae's innermost environment impose a number of complexities on an accurate calculation of the neutrino...
A core-collapse supernova (SN) offers an excellent astrophysical laboratory to
test non-zero neutrino magnetic moments. In particular, the neutronization burst
phase, which lasts for few tens of milliseconds post-bounce, is dominated by electron neutrinos and can offer exceptional discovery potential for transition magnetic
moments. We simulate the neutrino spectra from the burst phase in...
We simulated hadronic showers at PeV-EeV energy with CORSIKA to study the massive quark production and decay modes. In this regard, we specifically studied charm meson production and their decay channels with SYBILL and QGSJet models. This understanding would possibly help implement bottom quark production and their decay in these models. The massive quark decays contribute to the atmospheric...
The Pacific Ocean Neutrino Experiment (P-ONE) is a collaboration of Ocean Networks Canada (ONC) and Universities from Germany, Canada, and the USA to build a large volume neutrino telescope in the Pacific Ocean. Similar to other neutrino telescopes, P-ONE wants to instrument the ocean with photosensors deployed on vertical cables (lines) to detect high-energy neutrino interactions by the...
Early dark energy (EDE) alleviates the $H_0$ tension at the cost of increasing the clustering amplitude and worsening the $S_8$ discrepancy. Motivated by massive neutrinos' ability to suppress structure, we study their impact on EDE combining Planck and BOSS full-shape clustering data. A Bayesian analysis returns no evidence for a non-zero neutrino mass sum $M_{\nu}$ ($<0.15,{\rm eV}$ at...
A substantial fraction of systematic uncertainties in neutrino oscillation experiments stems from the lack of precision in modeling the nucleus when describing neutrino-nucleus interactions. Reducing these uncertainties is crucial for present and next-generation long baseline experiments. The T2K experiment is preparing for its second phase with the upgrade of its near detector starting next...
The LEGEND Collaboration is searching for neutrinoless double beta ($0\nu\beta\beta$) decay in Germanium-76 ($^{76}$Ge) via a phased approach. The first of two phases, LEGEND-200 (L200), will use 200 kg of enriched High Purity Germanium (HPGe) detectors, submerged in a liquid argon active shield, in order to target a half life sensitivity of 10$^{27}$ years. It is currently being commissioned...
