14–16 Oct 2026
Memorial Union
US/Central timezone

Contribution List

64 out of 64 displayed
  1. Jamie Holder (University of Delaware)
    14/10/2026, 09:30

    The Imaging Atmospheric Cherenkov technique has proved to be an extraordinarily successful approach to gamma-ray astronomy from the ground, covering the energy range from tens of GeV to 100 TeV with exceptional background discrimination, instantaneous sensitivity, and angular and energy resolution. The field is extremely active, with observations that address a wide range of topics; from the...

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  2. Elizabeth Hays (NASA Goddard Space Flight Center)
    14/10/2026, 11:00

    This year marks the 18th launch anniversary of the Fermi Gamma-ray Space Telescope. The Fermi era has opened up access to the GeV gamma-ray sky and enabled science discoveries across a wide range of astronomical phenomena, including white dwarfs, neutron stars, black holes and their energetic activities. With that progress, the field continues to work on big questions about the origins of...

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  3. Sarah Vigeland (University of Wisconsin-Milwaukee)
    15/10/2026, 09:00

    Pulsar timing array experiments around the world have found evidence of nanohertz gravitational waves in the form of a stochastic gravitational wave background. This discovery opens another window on the gravitational wave universe that we can use to study a variety of astrophysical and cosmological sources, as well as perform tests of gravity. Pulsar timing arrays search for gravitational...

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  4. Bradford Benson (University of Chicago, Fermilab)
    15/10/2026, 09:30

    Over the next several years, more sensitive measurements of the polarization anisotropy of the cosmic microwave background (CMB) are poised to lead to substantial improvements in cosmological constraints. On degree angular scales, the amplitude of the B-mode polarization gives a constraint on the energy scale of cosmic Inflation, with measurements in the next several years improving...

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  5. Vedant Basu (University of Utah)
    15/10/2026, 11:30

    This talk will cover the analysis of cosmic neutrinos and recent results from the IceCube Neutrino Observatory. We go over measurements of the astrophysical neutrino spectrum and what this reveals about the dynamics of their sources in cosmic ray accelerators. We will also investigate specific neutrino sources, including the Milky Way.

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  6. Viktoriya Dik (Joint Institute for Nuclear Research)
    15/10/2026, 14:00

    The Baikal-GVD neutrino telescope is a large-scale underwater detector designed for the study of high-energy cosmic neutrinos and their astrophysical sources. The detector is being continuously expanded in Lake Baikal and is approaching a cubic-kilometer sensitive volume. We present the current status of the telescope, including  real-time data processing and recent astrophysical results...

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  7. Abigail Vieregg (University of Chicago)
    15/10/2026, 14:30

    The highest energy astrophysical and cosmogenic neutrinos still await discovery, and allow us to understand the most energetic cosmic accelerators in the universe. I will discuss the status, plans, and highlight recent results from experiments that aim to detect the highest energy neutrinos, focusing on instruments that look for radio emission from in-ice interactions from UHE neutrinos. I...

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  8. John Beacom (ORCID)
    16/10/2026, 09:00

    Advancing neutrino astronomy depends upon detecting many types of neutrino sources and making connections between them. Here I discuss challenges in supernova neutrino detection and how addressing them benefits the larger field.

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  9. Delaney Butterfield (University of Wisconsin-Madison)
    16/10/2026, 10:00

    The IceCube Neutrino Observatory has been successfully operating for 15 years at the South Pole. During this time, IceCube has made many groundbreaking observations in neutrino astrophysics, including the discovery of a high-energy astrophysical neutrino flux; the Seyfert galaxy NGC1068 as a neutrino source candidate; and neutrinos from the Milky Way.
    In the 2025/26 Antarctic field season, an...

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  10. Paul De Jong (Nikhef and University of Amsterdam)
    16/10/2026, 11:30

    The KM3NeT collaboration is constructing two neutrino telescope infrastructures in the Mediterranean Sea, ORCA for GeV-energy neutrinos, and ARCA for neutrinos with multi-TeV energies. In this presentation the progress of both infrastructures is discussed, as well as the outlook for completion. Via the path of data acquisition, data quality assessment, calibration and reconstruction, some...

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  11. Prof. Carlos Arguelles Delgado (Harvard University)
    16/10/2026, 12:00

    High-energy neutrinos produced in collisions of protons in the atmosphere or near the vicinity of black holes bring unique opportunities to probe fundamental physics. The unprecedented energy ranges and distance traversed by these neutrinos have enabled the IceCube Neutrino Observatory to search for low-energy signatures of quantum gravity and new neutrino phenomena. In this colloquium, I will...

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  12. Marek Kowalski (DESY / HU Berlin)
    16/10/2026, 14:30

    I will provide an overview of the IceCube-Gen2 observatory currently under development.

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  13. 16/10/2026, 15:00

    Moderated by Ke Fang, Marek Kowalski, Carlos Arguelles Delgado, and Dan Hooper

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  14. Janeth Valverde
    Talk

    The physical processes behind unobservable activities in cosmic accelerators can be uniquely studied through the investigation of temporal variability exhibited by extreme astrophysical objects. These variations could be tied to the nature of the parent particle population, leptonic or hadronic, changes in the field strength or particle acceleration in the emission zone, to the precession of...

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  15. Justin Finke (ORCID)
    Talk

    I present a leptonic model for neutrino emission from blazars. This model includes two major emission components: a small blob and a large blob. The large blob can produce optical, X-ray, and gamma-ray emission through the synchrotron and synchrotron self-Compton processes. The small blob produces gamma-rays by Compton scattering of photons from the nearby part of an extended jet. The extended...

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  16. Alisha Roberts (University of Wisconsin-Madison)
    Talk

    We perform a joint analysis of the high-energy neutrino emission observed from the Galactic Plane by IceCube and the diffuse ultra-high-energy gamma-ray emission measured by LHAASO. We compare this data to models that include diffuse emission from cosmic-ray interactions in the interstellar medium, unresolved TeV halos, and unresolved Galactic neutrino sources. We find that the gamma-ray...

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  17. Samyak Jain (University of Wisconsin - Madison)
    Talk

    Active Galactic Nuclei are promising cosmic ray accelerators, making them prime candidates for searches for astrophysical neutrinos. In recent years, many gamma-ray bright source classes have been excluded as neutrino sources, indicating that sites of high-energy neutrino production must be optically thick, and the electromagnetic signatures of neutrino production may reside at lower energies....

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  18. Jose Carpio
    Talk

    Transient sources are well-motivated candidates for sources of high-energy neutrino emission. Here, we report the first all-flavor, all-sky time-dependent search for neutrino sources by combining IceCube throughgoing tracks, starting tracks and cascades. Throughgoing tracks provide the best sensitivity in the Northern Sky, while cascades have worse angular resolution but yield better...

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  19. Hongyi Wu (University of Wisconsin-Madison)
    Talk

    Extended TeV gamma-ray emission around middle-aged pulsars, commonly referred to as TeV halos, provides evidence for strongly inhibited cosmic-ray transport near these sources. The few well-established TeV halos have characteristic radii of approximately 20–30 pc and inferred diffusion coefficients 100–1000 times smaller than the Galactic average. Using 2860 days of data from the High Altitude...

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  20. Shoukat Ali (ORCID)
    Talk

    In-ice radio experiments such as the Askaryan Radio Array at the South Pole and the Radio Neutrino Observatory in Greenland rely on an accurate understanding of radio-wave propagation through polar ice. In particular, the density and corresponding index-of-refraction profile of the near-surface firn affect the propagation of upward-going and reflected radio signals, as well as radio signals...

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  21. Nicolas San Martin (Colorado School of Mines)
    Talk

    The Pierre Auger Observatory has achieved unprecedented precision in measurements of mass-sensitive air-shower observables of ultra-high-energy cosmic rays (UHECRs). These measurements provide important constraints on their origin and propagation, as well as on the production of secondary particles at the highest energies. In particular, the depth of shower maximum, $X_{\rm max}$, and its...

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  22. Marissa Boucher (University of Chicago)
    Talk

    The Askaryan effect in dense dielectric media allows for the detection of ultrahigh energy (UHE) neutrinos and cosmic rays via their radio-wavelength emissions in polar ice. In-ice radio detectors like ARA, RNO-G, and the proposed IceCube-Gen2 radio array receive signals that have traveled over kilometer scales, at which distance the medium's depth-dependent refractive index has a significant...

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  23. Toni Bertólez-Martínez (University of Wisconsin-Madison)
    Talk

    KM3NeT’s detection of a muon track produced by a ∼220 PeV neutrino provides an opportunity to probe physics at center-of-momentum energies greater than those probed by the Large Hadron Collider or other existing particle accelerators. In this talk, I will discuss how this single event can place an upper limit on the neutrino-nucleon cross section, which could be used to constrain a variety of...

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  24. Shigeo Kimura (ORCID)
    Talk

    The sources of astrophysical high-energy neutrinos are still under debate. Astrophysical transients, including peculiar supernovae and tidal disruption events, are plausible candidates. We examine whether these optical transients are the source of neutrinos by analyzing optical observational data to IceCube neutrino alerts. We follow a blind analysis policy to robustly evaluate the background...

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  25. Zachary Martin (ORCID)
    Talk

    Extensive air showers initiated by cosmic particles produce coherent radio frequency (RF) emission, enabling radio detection as a powerful probe at ultrahigh energies above 100 PeV. The Beamforming Elevated Array for COsmic Neutrinos (BEACON) is a proposed detector concept comprising mountaintop phased radio arrays in search for 30 – 80 MHz radio emission originating from Earth-skimming tau...

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  26. Justin Vandenbroucke
    Poster

    While astrophysical gamma rays and cosmic rays do not reach the ground, they generate a shower of particles when they interact in the atmosphere. This shower then generates a brief, but bright, flash of Cherenkov light. The detection of this Cherenkov light is often performed with imaging atmospheric Cherenkov telescopes (IACTs) which are incredibly large and sensitive instruments. I am...

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  27. Alexander Luke Kyriacou (ORCID)
    Talk

    Several experiments aim to detect ultra-high-energy neutrinos (UHENs) by instrumenting the upper 100 to 200 m of the polar ice sheets with radio antennas, either searching for Askaryan emission from in-ice particle cascades or illuminating the ice with radar and searching for reflections off the resulting ionization trails. These detector geometries make them sensitive to radio propagation...

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  28. Maxwell Nakos
    Talk

    In 2023, KM3NeT observed a high-energy neutrino candidate with an estimated energy of greater than 100 PeV. The IceCube Neutrino Observatory, despite its substantially larger exposure, has not yet observed a neutrino of comparable energy. This motivates further efforts to enhance IceCube’s sensitivity at the highest energies. To improve the selection efficiency for high-energy neutrinos, we...

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  29. Alan Salcedo Gomez
    Talk

    In this talk, we report the first diffuse ultrahigh energy (UHE) neutrino search using all five stations of the Askaryan Radio Array (ARA) at the South Pole. ARA searches for radio-frequency Askaryan emission from particle showers initiated by neutrino interactions in Antarctic ice. This search uses data collected from 2013 through 2023, corresponding to 10.6 years of livetime and a dataset...

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  30. Arifa Khatee Zathul
    Talk

    In the latest IceCube Upgrade season, several new optical sensor modules were deployed as R&D prototypes for Gen2 of the IceCube Neutrino Observatory. Among them are three Fluorescent Optical Modules (FOMs), which use wavelength-shifting light collectors to absorb ultraviolet Cherenkov photons and re-emit them at visible wavelengths, which enhance the sensitivities of the photomultiplier...

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  31. Matthias Thiesmeyer (University of Wisconsin-Madison)
    Talk

    Many modern astroparticle physics experiments rely on simulation of air showers to model their signal and background. The challenge with these simulations is the accurate modeling of large amounts of particle interactions in realistic media. The current solution is time- and resource-intensive Monte Carlo campaigns tuned to the specific experiments. For the IceCube Neutrino Observatory, this...

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  32. Angelina Sherman (o=uwmad,ou=Institutions,dc=icecube,dc=wisc,dc=edu)
    Poster

    AGN disks may contain a population of embedded stellar-mass black holes with accretion rates limited by feedback mechanisms such as winds or jets. Here, we consider the potential for such winds to serve as sites of particle acceleration and TeV - PeV neutrino production. We employ a simple Shakura-Sunyaev AGN disk model harboring a population of embedded stellar-mass black holes. These black...

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  33. Sam Hori (UW-Madison)
    Talk

    Compact binary mergers detected by gravitational wave detectors are some of the most promising multi-messenger sources. The binary neutron star merger GW170817 led to the first multi-messenger source when both gravitational waves and an electromagnetic counterpart were observed. The observation of a neutrino counterpart to a gravitational wave event would not only confirm these as cosmic-ray...

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  34. Tianyi Ding
    Talk

    Dark matter can accumulate in the center of the Earth as the planet moves through the Milky Way halo. Its annihilation into Standard Model particles can be probed through indirect searches, with neutrinos offering a unique messenger because they can escape dense regions. Neutrino telescopes, with their large volumes and broad energy coverage, therefore provide an opportunity to search for dark...

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  35. Will Thompson (Harvard University)
    Talk

    Reconstructing the incoming direction of muons is a fundamental task in neutrino astronomy. In water- and ice-Cherenkov telescopes, accurate muon reconstruction is important to the entire span of an analysis, from background rejection to accurately determining the position of neutrino point sources. It is therefore crucial to both optimize and understand the performance of muon track...

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  36. Zachary Curtis-Ginsberg (University of Wisconsin - Madison)
    Talk

    Supernova remnants and pulsar wind nebulae are likely sources of Galactic cosmic-ray protons and electrons, but these are not sufficient; these sources are generally unable to explain cosmic rays with energies of ~1 PeV. To explain cosmic rays with PeV energies requires sources to accelerate them to these energies, so-called PeVatrons. These cosmic-ray PeVatrons must accelerate protons...

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  37. Nathaniel Alden (University of Chicago)
    Talk

    In-ice radio detectors have been developed primarily for the detection of high-energy neutrinos via the Askaryan effect, but have recently been shown to be sensitive to cosmic ray air showers impacting the ice sheet. In this talk, we show how the Askaryan signal from cosmic rays could be used to measure the cosmic ray energy spectrum and mass composition above $10^{17}$eV. If experimentally...

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  38. Ali Kheirandish (University of Nevada, Las Vegas)
    Talk

    Observation of high-energy neutrinos from the direction of the nearby active galaxy, NGC 1068, was a major step in identifying the origin of high-energy neutrinos. This observation revealed that high-energy neutrinos originated at the heart of active galaxies, that are opaque to very-high-energy gamma-ray emission.
    his realization is reinforced by the excess of neutrinos in the direction of...

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  39. Yuhua Yao
    Poster

    High-energy neutrinos directly probe hadronic interactions, yet the sources of most of IceCube’s diffuse astrophysical neutrino flux remain unknown. The lack of significant point-source detections suggests that much of this flux may arise from populations of faint sources, motivating population-level searches. IceCube’s high-energy neutrino alert program enables a data-driven search for...

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  40. Joshua Ziegler (ORCID)
    Talk

    Supernova remnants (SNRs) are believed to be a prominent engine for accelerating nuclei to produce cosmic rays. When these accelerated nuclei interact with stationary protons, they can produce charged pions, which decay into charged leptons and neutrinos. Because the neutrino emission can be directly traced back to the SNR source, comparisons between the neutrino and photon fluxes offer an...

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  41. Luca Riitano
    Talk

    The Cherenkov Telescope Array Observatory (CTAO) is a next-generation imaging atmospheric Cherenkov telescope (IACT) array that will improve upon the current sensitivity to very-high-energy gamma rays by an order of magnitude. Featuring a high-resolution silicon photomultiplier (SiPM) camera and innovative dual-mirror optics, the Schwarzschild-Couder Telescope (SCT) is a candidate design for a...

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  42. Chen Li
    Talk

    Based on the multi-messenger observations of some of the most prominent neutrino-emitting AGNs, namely NGC 1068, TXS 0506+056, NGC 4151, CGCG 420-015, Circinus Galaxy, and NGC 7469, we simulate corona model to fit their multi-messenger fluxes. Our model shows that corona X-rays are originated from within $\sim 10$ Schwarzschild radii of the SMBHs, with lower values preferred, and they absorb...

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  43. Justin Mitchell (Southern University A&M College)
    Poster

    This work describes the response of the IceCube Neutrino Observatory and its successive extensions to low energy neutrinos from the core collapse of progenitor stars in the kpc range. IceCube detects such bursts not through individual event reconstruction, but through a collective rise in photomultiplier rates above the dark noise floor, a reach historically estimated using a single averaged...

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  44. Tianlu Yuan (University of Wisconsin–Madison)
    Talk

    Cherenkov radiation, produced by charged particles traveling above the phase velocity of light in dielectric media, has played a crucial role in neutrino detection. Facilities such as SuperK, KM3Net and IceCube rely on it to detect secondaries produced in neutrino interactions. At energies above approximately 10 GeV, neutrinos deep-inelastic scatter off of target nucleons, breaking them apart...

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  45. Alicia Mand (University of Wisconsin - Madison)
    Poster

    On February 13, 2023, the KM3NeT detector, a soon-to-be cubic-kilometer neutrino telescope in the Mediterranean Sea, observed the highest-energy (~200 PeV) neutrino detected to date, designated KM3-230213A. This measurement marks an important milestone for astroparticle physics, and its origins could provide insight into the most extreme processes in the Universe. The IceCube Neutrino...

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  46. Alicia Mand (University of Wisconsin - Madison)
    Talk

    Fast radio bursts (FRBs) are an extremely luminous class of millisecond-duration radio transients, which are mostly extragalactic. Despite radio telescopes such as the Canadian Hydrogen Intensity Mapping Experiment (CHIME) detecting thousands of FRBs, their origins and production mechanisms are largely unknown. Their only known source association is with an X-ray flare from the Galactic...

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  47. Yuhua Yao
    Talk

    IceCube has detected neutrino emission from the Galactic plane with a significance of 5.7σ, although no individual Galactic sources have yet been identified as contributors. Meanwhile, gamma-ray observatories, including HAWC, LHAASO, and H.E.S.S., have identified Galactic sources emitting photons above 100 TeV. If these gamma rays are produced through hadronic interactions, they should be...

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  48. Andreas Haungs (KIT)
    Talk

    KASCADE-Grande was designed to investigate the energy spectrum and mass composition of cosmic rays in the energy range from 10 PeV to 1 EeV. Its measurements revealed a knee-like feature in the spectrum of heavy primaries at energies around 100 PeV, consistent with expectations from rigidity-dependent acceleration and propagation scenarios. In addition, a hardening of the light-component...

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  49. Tianyi Ding
    Poster

    High-energy neutrinos are believed to be produced in cosmic accelerators as a result of hadronic interactions. Cores of active galactic nuclei are considered to be among the primary sites for cosmic-ray acceleration and neutrino production. The latter is facilitated by the dense matter and radiation in the vicinity of the supermassive black holes. The recent observation by the IceCube Neutrino...

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  50. Shi Yan (UW Madison)
    Talk

    TeV pulsars are promising candidate sources of high-energy neutrinos, and the detection of pulsed neutrino emission would provide compelling evidence for hadronic particle acceleration in their environments. To search for such emission, we employ two complementary methods. Possible correlations between the neutrino and gamma-ray pulse profiles motivate a template-based search using measured...

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  51. Dylan Frikken (Vrije Universiteit Brussel)
    Talk

    The Radar Echo Telescope for Cosmic Rays (RET-CR), a pathfinder experiment for a future
    ultrahigh energy neutrino detector, is a recently deployed experiment designed to detect the
    ionization trail from an in-ice cosmic ray shower via active radar sounding. In high-elevation
    ice sheets, a high-energy cosmic ray (E >10 PeV) at shallow zenith angle deposits more than 10
    percent of its...

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  52. Sam Groetsch (UW-Madison)
    Talk

    In the last decade, the discovery of extended regions of TeV emission around several middle-aged pulsars, called TeV Halos, has spawned many studies of the characteristics and prevalence of this new source class. Both the HAWC and LHAASO observatories have included potential TeV Halo candidate pulsars in their catalogs of TeV sources for many years. Several individual analyses of potential...

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  53. Qinrui Liu
    Talk

    The flavor composition of high-energy astrophysical neutrinos carries information about neutrino production and the conditions inside their sources. Neutrinos from charmed-hadron decays are usually neglected due to the suppressed heavy-flavor hadron production relative to pions and kaons. However, because of synchrotron losses, beyond the well-known transition from the pion-decay to the...

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  54. Keith McBride (University of Chicago)
    Talk

    Ultrahigh-energy cosmic rays (UHECR) should produce ultrahigh-energy neutrinos (UHEN, >10^18 eV) as byproducts of their propagation. Many candidate UHECR source models also predict an emission of UHEN local to their acceleration sites. The Payload for Ultrahigh Energy Observations (PUEO), the successor to the ANtarctic Impulsive Transient Antenna (ANITA), is a balloon-borne observatory that...

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  55. Marek Kowalski (DESY / HU Berlin)
    Talk

    With the first high-energy neutrino sources identified, the bulk of IceCube's diffuse flux remains unresolved, which points to a population of numerous faint emitters. Stacking searches that correlate neutrino events with source catalogs have been carried out before, but inappropriate source weighting may have left them insensitive to such populations. We show how to avoid this loss of...

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  56. Stephanie Wissel (Pennsylvania State University)
    Talk

    The Radio Neutrino Observatory in Greenland: Status and Science
    Neutrinos are powerful probes of both astrophysics and fundamental particle physics at the highest energies. Weakly interacting and uncharged, they propagate undeterred and unabsorbed through the universe. At the highest energies, beyond the PeV scale, current neutrino experiments become too small to observe a sizable flux....

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  57. Angelina Sherman (o=uwmad,ou=Institutions,dc=icecube,dc=wisc,dc=edu)
    Talk

    Several observatories designed to detect ultrahigh-energy neutrinos are planned for the next decade. The first of these to take data is the Payload for Ultrahigh Energy Observations (PUEO), a long-duration balloon-based experiment that will provide unprecedented sensitivity to neutrinos with energies in the range of ∼1−1000 EeV. In this work, we assess the scientific reach of PUEO. In...

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  58. Perri Zilberman
    Talk

    There is an observed anisotropy in the arrival direction distribution of cosmic rays in the TeV-PeV regime, with variations on the scale of one part in a thousand. While the origin of this anisotropy is an open question, a possible factor is cosmic-ray interactions with interstellar and heliospheric magnetic fields. These magnetic fields may change over time - for example, due to changes in...

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  59. Man Hei Leung (ORCID)
    Talk

    High-energy cosmic rays blocked by the Sun produce a solar shadow whose shape is distorted by the coronal magnetic field. With new observatories now making short-timescale measurements increasingly possible, we investigate how the shadow evolves with the changing solar magnetic environment. Using TeV cosmic ray simulations and 3D coronal field models, we explore how different coronal field...

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  60. Leo Seen (University of Wisconsin - Madison)
    Talk

    IceCube has now detected the Galactic neutrino flux at 5.7$\sigma$ with an excess of in-ice particle shower events towards the inner Galaxy. We show that both the spectral and longitudinal distributions of the IceCube neutrinos can be explained by including contributions from Galactic $\gamma$-ray sources in addition to diffuse emission from the Galactic cosmic-ray sea. We test various...

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  61. Shigeru Yoshida
    Talk

    The James Webb Space Telescope (JWST) revealed a large population of active galactic nuclei (AGN) with redshifts greater than five. We show that if they emit ultrahigh-energy protons with energies up to ≲10 EeV, the cosmogenic neutrino production in the high-redshift CMB field yields a neutrino flux with a bump at around 50 PeV. This flux is potentially consistent with the current neutrino...

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  62. Viviana Rickert
    Talk

    The Cherenkov Telescope Array Observatory (CTAO) is a ground-based very-high-energy gamma-ray observatory currently in development that observes gamma-rays via Cherenkov radiation. The Schwarzchild-Couder Telescope (SCT) is a design candidate for Medium-Sized Telescopes (MSTs) at CTAO-South, with the potential for additional SCTs to later improve the performance of CTAO. The prototype...

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  63. Alexander Plavin (ORCID)
    Talk

    IceCube neutrinos select some of the most extreme blazars known. Population studies reveal this pattern statistically, and here I will focus on two individual blazars singled out by IceCube: TXS 0506+056 and PKS 1424+240. Together, they expose the physics behind the population-level result with high-resolution radio monitoring revealing a surprising picture. What look like slow jets are...

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  64. Shigeru Yoshida (ICEHAP, Chiba University)
    Talk

    The majority of multi-messenger observations that combine X-rays and neutrinos to target transient objects have been restricted to reporting flux upper limits, yielding minimal physical insights. We hereby propose a novel analytical method that integrates a generic cosmic-ray and neutrino emission model with unspecified physical parameters and a novel data analysis approach, which enables the...

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