Theo Glauch
A5076412449- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Radio Wave Propagation Studies
- Atmospheric and Environmental Gas Dynamics
- Gyrotron and Vacuum Electronics Research
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Particle accelerators and beam dynamics
- Cryospheric studies and observations
- Neural Networks and Applications
- Radiation Detection and Scintillator Technologies
- Precipitation Measurement and Analysis
- Astronomical Observations and Instrumentation
- Vehicle emissions and performance
- Advanced Optical Sensing Technologies
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Air Quality Monitoring and Forecasting
Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)
2024-2025
Technical University of Munich
2017-2024
The University of Texas at Arlington
2018-2024
Lawrence Berkeley National Laboratory
2023-2024
University of Alaska Anchorage
2018-2024
Providence College
2018-2024
Clark Atlanta University
2018-2024
Southern University and Agricultural and Mechanical College
2018-2024
RWTH Aachen University
2017-2023
Campbell Collaboration
2019-2023
A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. Prompted this association, we investigated 9.5 years of observations to search for excess emission at position blazar. We found an events, respect atmospheric backgrounds, that between 2014 March 2015. Allowing time-variable flux, constitutes 3.5σ evidence 0506+056, independent prior flaring episode. This suggests blazars are...
Individual astrophysical sources previously detected in neutrinos are limited to the Sun and supernova 1987A, whereas origins of diffuse flux high-energy cosmic remain unidentified. On 22 September 2017 we a neutrino, IceCube-170922A, with an energy approximately 290 TeV. Its arrival direction was consistent location known gamma-ray blazar TXS 0506+056, observed be flaring state. An extensive multi-wavelength campaign followed, ranging from radio frequencies gamma-rays. These observations...
This Letter presents the results from pointlike neutrino source searches using ten years of IceCube data collected between April 6, 2008 and July 10, 2018. We evaluate significance an astrophysical signal a looking for excess clustered events with energies typically above ∼1 TeV among background atmospheric muons neutrinos. perform full-sky scan, search within selected catalog, catalog population study, three stacked Galactic searches. The most significant point in northern hemisphere...
Since the recent detection of an astrophysical flux high energy neutrinos, question its origin has not yet fully been answered. Much what is known about this comes from a small event sample neutrino purity, good resolution, but large angular uncertainties. In searches for point-like sources, on other hand, best performance given by using statistics and reconstructions. Track-like muon events produced in interactions satisfy these requirements. We present here results sources with neutrinos...
We report on the first measurement of astrophysical neutrino flux using particle showers (cascades) in IceCube data from 2010-2015. Assuming standard oscillations, neutrinos this dedicated cascade sample are dominated (∼90%) by electron and tau flavors. The flux, observed sensitive energy range 16 TeV to 2.6 PeV, is consistent with a single power-law model as expected Fermi-type acceleration high particles at sources. find spectral index be γ=2.53±0.07 normalization for each flavor...
We present results from an analysis looking for dark matter annihilation in the Sun with IceCube neutrino telescope. Gravitationally trapped Sun's core can annihilate into Standard Model particles making a source of GeV neutrinos. is able to detect neutrinos energies >100 while its low-energy infill array DeepCore extends this >10 GeV. This uses data gathered austral winters between May 2011 and 2014, corresponding 532 days livetime when Sun, being below horizon, up-going events, easiest...
We present a measurement of the atmospheric neutrino oscillation parameters using three years data from IceCube Neutrino Observatory. The DeepCore infill array in center enables detection and reconstruction neutrinos produced by interaction cosmic rays Earth's atmosphere at energies as low ∼5 GeV. That energy threshold permits measurements muon disappearance, over range baselines up to diameter Earth, probing same L/Eν long-baseline experiments but with substantially higher-energy neutrinos....
We present the dissection in space, time, and energy of region around IceCube-170922A neutrino alert. This study is motivated by: (1) first association between a alert blazar flaring state, TXS 0506+056; (2) evidence activity during 2014 - 2015 from same direction; (3) lack an accompanying simultaneous $\gamma$-ray enhancement counterpart; (4) contrasting neighbouring bright source, PKS 0502+049, 2015. Our makes use multi-wavelength archival data accessed through Open Universe tools includes...
We present a search for light sterile neutrino using three years of atmospheric data from the DeepCore detector in energy range approximately $10-60~$GeV. is low-energy sub-array IceCube Neutrino Observatory. The standard three-neutrino paradigm can be probed by adding an additional ($\Delta m_{41}^2 \sim 1 \mathrm{\ eV^2}$) neutrino. Sterile neutrinos do not interact through weak interaction, and therefore cannot directly detected. However, their mixing with active states leaves imprint on...
We report on measurements of the all-particle cosmic ray energy spectrum and composition in PeV to EeV range using three years data from IceCube Neutrino Observatory. The IceTop detector measures induced air showers surface ice, which rays is determined by making additional assumptions about mass composition. A separate measurement performed when are analyzed coincidence with high-energy muon loss information deep in-ice detector. In this measurement, both primary simultaneously...
The origins of high-energy astrophysical neutrinos remain a mystery despite extensive searches for their sources. We present constraints from seven years IceCube Neutrino Observatory muon data on the neutrino flux coming Galactic plane. This is expected cosmic-ray interactions with interstellar medium or near localized Two methods were developed to test spatially-extended entire plane, both maximum likelihood fits but different signal and background modeling techniques. consider three...
The IceCube Collaboration has observed a high-energy astrophysical neutrino flux and recently found evidence for emission from the blazar TXS 0506+056. These results open new window into universe. However, source or sources of most neutrinos remains uncertain. Here, search steady point-like is performed using an unbinned likelihood analysis. method searches spatial accumulation muon-neutrino events very high-statistics sample about $497\,000$ recorded by between 2009 2017. median angular...
We present a measurement of atmospheric tau neutrino appearance from oscillations with three years data the DeepCore subarray IceCube Neutrino Observatory. This analysis uses neutrinos full sky reconstructed energies between 5.6 and 56 GeV to search for statistical excess cascadelike events which are signature ${\ensuremath{\nu}}_{\ensuremath{\tau}}$ interactions. For $\mathrm{CC}+\mathrm{NC}$ (CC-only) interactions, we measure normalization be ${0.73}_{\ensuremath{-}0.24}^{+0.30}$...
Inelasticity--the fraction of a neutrino's energy transferred to hadrons--is quantity interest in the study astrophysical and atmospheric neutrino interactions at multi-TeV energies with IceCube. In this work, sample contained IceCube is obtained from 5 years data classified as 2650 tracks 965 cascades. Tracks arise predominantly charged-current $\nu_{\mu}$ interactions, we demonstrate that can reconstruct their inelasticity. The inelasticity distribution found be consistent calculation...
The association of two IceCube detections, the IceCube-170922A event and a neutrino flare, with blazar TXS0506+056, has paved way for multimessenger quest cosmic accelerators. observed many other neutrinos but their origin remains unknown. To better understand reason apparent lack counterparts we have extended comprehensive dissection sky area performed to all 70 public high-energy that are well reconstructed off Galactic plane. Using multi-frequency data available through Open Universe...
We present a search for neutrino signal from dark matter self-annihilations in the Milky Way using IceCube Neutrino Observatory (IceCube). In 1005 days of data we found no significant excess neutrinos over background produced atmospheric air showers cosmic ray interactions. derive upper limits on velocity averaged product self-annihilation cross section and relative particles $$\langle \sigma _{\text {A}}v\rangle $$ . Upper are set particle candidate masses ranging 10 GeV up to 1 TeV while...
Abstract The Nord Stream pipeline leaks on 26 September 2022 released 465 ± 20 kt of methane into the atmosphere, which is largest recorded transient anthropogenic emission event. While most gas escaped directly to a fraction dissolved in water. So far, studies fate this rely volumetric estimates or spatially sparse concentration measurements and ocean models. Here, we use atmospheric with broad spatial coverage obtained from an airborne platform estimate outgassing 19-48 t h −1 5 October...
We present an all-sky search for muon neutrinos produced during the prompt $\gamma$-ray emission of 1172 gamma-ray bursts (GRBs) with IceCube Neutrino Observatory. The detection these would constitute evidence ultra-high energy cosmic ray (UHECR) production in GRBs, as interactions between accelerated protons and field yield charged pions, which decay to neutrinos. A previously reported neutrino tracks from Northern Hemisphere GRBs has been extended include three additional years data. such...
With the observation of high-energy astrophysical neutrinos by IceCube Neutrino Observatory, interest has risen in models PeV-mass decaying dark matter particles to explain observed flux. We present two dedicated experimental analyses test this hypothesis. One analysis uses 6 years data focusing on muon neutrino 'track' events from Northern Hemisphere, while second 2 'cascade' full sky. Known background components and hypothetical flux unstable are fitted data. Since no significant excess is...
As atmospheric neutrinos propagate through the Earth, vacuum-like oscillations are modified by Standard-Model neutral- and charged-current interactions with electrons. Theories beyond Standard Model introduce heavy, TeV-scale bosons that can produce nonstandard neutrino interactions. These additional may modify matter effect producing a measurable deviation from prediction for oscillations. The result described in this paper constrains interaction parameters, building upon previous analysis...
We present the results of first IceCube search for dark matter annihilation in center Earth. Weakly Interacting Massive Particles (WIMPs), candidates matter, can scatter off nuclei inside Earth and fall below its escape velocity. Over time captured WIMPs will be accumulated may eventually self-annihilate. Among products only neutrinos from Large-scale neutrino telescopes, such as cubic kilometer Neutrino Observatory located at South Pole, used to fluxes. Data 327 days detector livetime...
Efficient treatment of systematic uncertainties that depend on a large number nuisance parameters is persistent difficulty in particle physics and astrophysics experiments. Where low-level effects are not amenable to simple parameterization or re-weighting, analyses often rely discrete simulation sets quantify the key analysis observables. Such methods may become computationally untenable for requiring high statistics Monte Carlo with degrees freedom, especially cases where these freedom...
Abstract Pulsar wind nebulae (PWNe) are the main gamma-ray emitters in Galactic plane. They diffuse that emit nonthermal radiation. winds, relativistic magnetized outflows from central star, shocked ambient medium produce a multiwavelength emission radio through gamma-rays. Although leptonic scenario is able to explain most PWNe emission, hadronic contribution cannot be excluded. A possible high-energy inevitably leads production of neutrinos. Using 9.5 yr all-sky IceCube data, we report...
We present two searches for IceCube neutrino events coincident with 28 fast radio bursts (FRBs) and one repeating FRB. The first improves upon a previous analysis -- searching spatial temporal correlation of FRBs at energies greater than roughly 50 GeV by increasing the effective area an order magnitude. second is search MeV FRBs. No significant found in either search, therefore, we set upper limits on time-integrated flux emitted range emission timescales less day. These are FRB scale,...