NPAC (Nuclear/Particle/Astro/Cosmo) Forums

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Organized by: Prof. Lu Lu

Events During the Week of March 31st through April 7th, 2024

Monday, April 1st, 2024

Opening the PeV Neutrino Window with Trinity
Time: 9:00 am - 10:00 am
Place: 5310 Chamberlin Hall and
Speaker: A. Nepomuk Otte, Georgia Tech
Abstract: The stunning discoveries of the IceCube Neutrino Observatory have had a transformational effect on high-energy astrophysics. In this talk, I discuss the Trinity Demonstrator, the first step toward a Trinity Neutrino Observatory, which follows in the footsteps of IceCube by offering the prospect of detecting neutrinos at even higher energies (>petaelectronvolts). The goal is to unlock some of Nature’s best-kept secrets and explore fundamentally new physics.
Host: Francis Halzen
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Tuesday, April 2nd, 2024

No events scheduled

Wednesday, April 3rd, 2024

No events scheduled

Thursday, April 4th, 2024

Tuning into Cosmic Neutrinos at the Highest Energies
Time: 9:00 am - 10:00 am
Place: 5280 Chamberlin Hall
Speaker: Stephanie Wissel, Penn State
Abstract: 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. In the last decade, we have observed a flux of high-energy (TeV-scale) neutrinos and through a multi-messenger lens — the combined observations of neutrinos and other messengers like photons — we are starting to see hints of energetic neutrino sources for the first time. At higher energies still, beyond the PeV scale, we can probe the most energetic sources of both neutrinos and cosmic rays, but current neutrino experiments become too small to observe a sizable flux. With long propagation lengths in both ice and air, radio detection offers an attractive solution to building the gigaton-scale detectors needed by allowing us to build sparse detectors sensitive to neutrinos over hundreds of kilometers. In this talk, I will review the landscape of current radio neutrino experiments and how next generation detectors can lead to new discoveries. I will also present my vision for the future of the Wisconsin IceCube Particle Astrophysics Center.
Host: Francis Halzen
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Multi-wavelength emission from Jets of nearby radio galaxies
Time: 2:30 pm - 3:30 pm
Place: CH 5280
Speaker: Riku Kuze, Tohoku University
Abstract: Relativistic jets in radio galaxies emit multi-wavelength photons, indicating the existence of nonthermal particles. However, the origin of these nonthermal particles is unknown. One plausible scenario is the electron-positron pair production via the two-photon interaction using the gamma rays produced by magnetic reconnection in the black-hole magnetosphere. This scenario is possible if the accretion flow is in a highly magnetized state, i.e., magnetically arrested disk (MAD) state. We construct the multi-wavelength photon emission model based on this scenario. In this talk, we will show the results of applying our model to M87. We calculate emissions from jets and MADs and compare the model prediction to the simultaneous multi-wavelength observational data for M87. We find that the emission from jets explains the optical to the X-ray data, and that from MADs explains the gamma-ray data. We also estimate the neutrino emission from jets and MADs, and we find that the neutrino luminosity is too low to observe by the IceCube Gen-2.
Host: Ke Fang
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Friday, April 5th, 2024

No events scheduled