A5013880535- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Radio Wave Propagation Studies
- Gamma-ray bursts and supernovae
- Particle accelerators and beam dynamics
- Atmospheric Ozone and Climate
- Gyrotron and Vacuum Electronics Research
- Precipitation Measurement and Analysis
- Cryospheric studies and observations
- Cosmology and Gravitation Theories
- Noncommutative and Quantum Gravity Theories
- Geophysics and Gravity Measurements
- Computational Physics and Python Applications
- Experimental and Theoretical Physics Studies
- Pulsars and Gravitational Waves Research
- Environmental Monitoring and Data Management
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Soil Moisture and Remote Sensing
- Arctic and Antarctic ice dynamics
- Particle Detector Development and Performance
- GNSS positioning and interference
Chiba University
2023-2025
The University of Texas at Arlington
2021-2023
Southern University and Agricultural and Mechanical College
2021-2023
Clark Atlanta University
2021-2023
Harvard University
2023
King's College London
2023
Lawrence Berkeley National Laboratory
2023
The University of Adelaide
2023
Queen Mary University of London
2018-2022
University of Alaska Anchorage
2021
We describe a new data sample of IceCube DeepCore and report on the latest measurement atmospheric neutrino oscillations obtained with recorded between 2011--2019. The includes significant improvements in calibration, detector simulation, processing, analysis benefits from sophisticated treatment systematic uncertainties, significantly greater level detail since our last study. By measuring relative fluxes flavors as function their reconstructed energies arrival directions we constrain...
We report on a measurement of astrophysical tau neutrinos with 9.7 yr IceCube data. Using convolutional neural networks trained images derived from simulated events, seven candidate ν_{τ} events were found visible energies ranging roughly 20 TeV to 1 PeV and median expected parent energy about 200 TeV. Considering backgrounds atmospheric neutrinos, muons π^{±}/K^{±} decays in air showers, we obtain total estimated background 0.5 dominated by non-ν_{τ} neutrinos. Thus, rule out the absence at...
Abstract We present the results of a search for 10–1000 GeV neutrinos from 2268 gamma-ray bursts (GRBs) over 8 yr IceCube-DeepCore data. This work probes burst physics below photosphere where electromagnetic radiation cannot escape. Neutrinos tens giga electronvolts are predicted in sub-photospheric collision free-streaming neutrons with bulk-jet protons. In first analysis, we searched most significant neutrino-GRB coincidence using six overlapping time windows centered on prompt phase each...
The ordering of the neutrino mass eigenstates is one fundamental open questions in physics. While current-generation oscillation experiments are able to produce moderate indications on this ordering, upcoming next generation aim provide conclusive evidence. In paper we study combined performance two future multi-purpose JUNO and IceCube Upgrade, which employ very distinct complementary routes toward ordering. approach pursued by 20 kt medium-baseline reactor experiment consists a careful...
Abstract IceCube alert events are neutrinos with a moderate-to-high probability of having astrophysical origin. In this study, we analyze 11 yr data and investigate 122 selection high-energy tracks detected between 2009 the end 2021. This event (alert + tracks) has an average ≥0.5 being We search for additional continuous transient neutrino emission within events’ error regions. find no evidence significant from any directions. The only locally is associated blazar TXS 0506+056, local...
We show how 21 cm cosmology can test relic neutrino radiative decays into sterile neutrinos. Using recent EDGES results, we derive constraints on the lifetime of decaying If anomaly will be confirmed, then there are two solutions, one for much longer and shorter lifetimes than age universe, showing explain in a simple way. also to combine results with those from radio background observations, that potentially ARCADE 2 excess reproduced together within proposed non-standard cosmological...
In this paper, we study the effect of active-neutrino-sterile-neutrino mixing in expected high-energy astrophysical neutrino flavor content. Non-unitarity measurement three active neutrinos can be due to existence sterile states. We introduce concept four-flavor tetrahedron order visualize lack unitarity three-flavor triangle. demonstrate that active-sterile mixings modify allowed region ratio from standard case. However, a projection has restrictions phase space similar On other hand,...
We present a search for an eV-scale sterile neutrino using 7.5 years of data from the IceCube DeepCore detector. The analysis uses sample 21,914 events with energies between 5 and 150 GeV to neutrinos through atmospheric muon disappearance. Improvements in event selection treatment systematic uncertainties provide greater statistical power compared previous searches. Our results are compatible absence mixing active states, we place constraints on matrix elements <a:math...
Searching for the sources of high-energy cosmic particles requires sophisticated analysis techniques, frequently involving hypothesis tests with unbinned log-likelihood (LLH) functions. SkyLLH is an open-source, Python-based software tool to build these LLH functions and perform likelihood-ratio tests. We present a new easy-to-use modular extension that allows user neutrino point source searches in entire sky using ten years IceCube public data. To guide user, provides tutorials showing how...
Abstract The nature of dark matter remains unresolved in fundamental physics. Weakly Interacting Massive Particles (WIMPs), which could explain the matter, can be captured by celestial bodies like Sun or Earth, leading to enhanced self-annihilation into Standard Model particles including neutrinos detectable neutrino telescopes such as IceCube Neutrino Observatory. This article presents a search for muon from center Earth performed with 10 years data using track-like event selection. We...
We present a search for the diffuse extremely-high-energy neutrino flux using $12.6$ years of IceCube data. The non-observation neutrinos with energies well above $10 \, \mathrm{PeV}$ constrains all-flavor at $10^{18} \mathrm{eV}$ to level $E^2 \Phi_{\nu_e + \nu_\mu \nu_\tau} \simeq 10^{-8} \mathrm{GeV} \mathrm{cm}^{-2} \mathrm{s}^{-1} \mathrm{sr}^{-1}$, most stringent limit date. Using this data, we constrain proton fraction ultra-high-energy cosmic rays (UHECRs) $\simeq 30 \mathrm{EeV}$ be...
Abstract The Galactic plane, harboring a diffuse neutrino flux, is particularly interesting target in which to study potential cosmic-ray acceleration sites. Recent gamma-ray observations by HAWC and LHAASO have presented evidence for multiple sources that exhibit spatially extended morphology energy spectra continuing beyond 100 TeV. A fraction of such emission could be produced interactions accelerated hadronic cosmic rays, resulting an excess high-energy neutrinos clustered near these...
We describe a new data sample of IceCube DeepCore and report on the latest measurement atmospheric neutrino oscillations obtained with recorded between 2011-2019. The includes significant improvements in calibration, detector simulation, processing, analysis benefits from detailed treatment systematic uncertainties, significantly higher level detail since our last study. By measuring relative fluxes flavors as function their reconstructed energies arrival directions we constrain mixing...
This Letter presents the result of a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>3</a:mn><a:mo>+</a:mo><a:mn>1</a:mn></a:mrow></a:math> sterile neutrino search using 10.7 yr IceCube data. We analyze atmospheric muon neutrinos that traverse Earth with energies ranging from 0.5 to 100 TeV, incorporating significant improvements in modeling flux and detector response compared earlier studies. Notably, for first time, we categorize data into starting...
The ultra-light dark matter is a new class of candidates. Unlike traditional particle candidates, the behaves like classical field, and it saturates entire Milky Way galaxy with coherent oscillation. If such exists couples neutrinos, properties astrophysical neutrinos propagating in would be modified detectable by neutrino telescopes as IceCube. Meantime, IceCube looked for quantum-gravity-motivated effects from flavour information. did not find evidence physics, they set limits on - Lorentz...
The IceCube Neutrino Observatory, a cubic-kilometer-scale neutrino detector at the geographic South Pole, has reached number of milestones in field astrophysics: discovery high-energy astrophysical flux, temporal and directional correlation neutrinos with flaring blazar, steady emission from direction an active galaxy Seyfert II type Milky Way. next generation telescope, IceCube-Gen2, currently under development, will consist three essential components: array about 10,000 optical sensors,...
The science goals of IceCube-Gen2 include multi-messenger astronomy, astroparticle and particle physics. To this end, the observatory will several detection methods, including a surface array in-ice optical sensors. have an approximately 8 km$^{2}$ coverage, consisting elevated scintillator panels radio antennas to detect air showers in energy range 100 TeV few EeV. observatory’s design is unique that measurements using can be combined with observations ≥ 300 GeV muons, produced hadronic...
Ultra-light dark matter is a class of models where the mass particle very small and behaves as classical field pervading our galaxy. If astrophysical neutrinos interact with ultra-light matter, these interactions would produce potential in galaxy which may cause anomalous flavor conversions. Recently, IceCube high-energy starting event measurements are used to set stringent limits on isotropic Lorentz violating fields under Standard-Model Extension framework. We apply violation neutrino -...
We provide supporting details for the search a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>3</a:mn><a:mo>+</a:mo><a:mn>1</a:mn></a:mrow></a:math> sterile neutrino using data collected over 10.7 years at IceCube Neutrino Observatory. The analysis uses atmospheric muon-flavored neutrinos from 0.5 to 100 TeV that traverse Earth reach detector and finds best-fit point <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
We present new results on the calculation of dark matter relic abundance within Higgs induced right-handed (RH) neutrino mixing model, solving associated density matrix equation. For a benchmark value mass $M_{\rm DM} = 220\,{\rm TeV}$, we show evolution and how this depends reheat temperature, lifetime source RH S}$, with assumption S} < M_{\rm DM}$. compare those obtained Landau-Zener approximation, showing that latter largely overestimates final giving some analytical insight. However,...
In this paper we describe the first results of a compact imaging air-Cherenkov telescope, IceAct, operating in coincidence with IceCube Neutrino Observatory (IceCube) at geographic South Pole. An array IceAct telescopes (referred to as project) is under consideration part IceCube-Gen2 extension IceCube. Surface detectors general will be powerful tool for distinguishing astrophysical neutrinos from dominant backgrounds cosmic-ray induced atmospheric muons and neutrinos: IceTop already place...
The IceCube Observatory at the South Pole has been operating in its full configuration since May 2011 with a duty cycle of about 99%. Its main component consists cubic-kilometer array optical sensors deployed deep Glacial ice designed for detection high-energy astrophysical neutrinos. A surface cosmic ray air shower detection, IceTop, and denser inner subdetector, DeepCore, significantly enhance capabilities observatory, making it multipurpose facility. This list contributions to 38th...