Difference: NevisSeminars (34 vs. 35)

Revision 352015-03-17 - TimothyAndeen

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Nevis Seminar

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Date Time Speaker Title Description Notes Slides
Friday Feb. 27th 1pm Marcos Santander, Columbia University Searching for the sources of cosmic-rays with VERITAS and IceCube A century of cosmic-ray research has unveiled many of the key properties of these energetic particles that reach Earth from outer space. The sources of cosmic-rays, however, remain unknown. A potential clue to finding these elusive objects is the recent observation of an astrophysical flux of high-energy neutrinos by the IceCube detector as these particles may be produced in hadronic interactions near cosmic-ray accelerators. While the neutrino sky map shows no indication of point sources so far, their presence could be revealed by detecting the hadronic gamma-ray counterpart to the neutrino emission using the VERITAS air Cherenkov array. In this talk, I will describe the VERITAS and IceCube detectors, discuss the astrophysical implications of the neutrino flux observed by IceCube and outline how observations with gamma-ray telescopes can be used to reveal its origin. Lunch at 12:30 pm  
Friday Mar. 13th 1pm Daniel Whiteson, UC Irving Observing Ultra-High Energy Cosmic Rays with Smartphones We propose a novel approach for observing cosmic rays at ultra-high energy ($>10^{18}$~eV) by repurposing the existing network of smartphones as a ground detector array. Extensive air showers generated by cosmic rays produce muons and high-energy photons, which can be detected by the CMOS sensors of smartphone cameras. The small size and low efficiency of each sensor is compensated by the large number of active phones. We show that if user adoption targets are met, such a network will have significant observing power at the highest energies. Lunch at 12:30 pm  
Tuesday Mar. 24th 1pm Kerston Perez, Haverford College and Columbia University TBA TBA Lunch at 12:30 pm  
Tuesday Mar. 24th 1pm Kerston Perez, Haverford College and Columbia University Antideuteron Signatures of Dark Matter with the GAPS Experiment The question of the origin of dark matter, the mysterious matter known to permeate the universe, is one of the towering problems of 21st-century physics. Dozens of dark matter search experiments are currently planned or ongoing, but these efforts have been hampered by the large background rates from conventional astrophysical processes and the vast array of signatures that could indicate a dark matter interaction. The General Antiparticle Spectrometer (GAPS) experiment aims to advance these searches by detecting low-energy antideuterons that result from the self-annihilation of dark matter particles in the Galactic halo, providing an essentially background-free signature of dark matter. This signal probes supersymmetry, extra-dimensional theories, and other modes dark matter production, complementing and extending the reach of current experiments. In this seminar, I will present the design and discovery potential of the baloon-borne GAPS experiment, which exploits a novel detection technique utilizing exotic atom capture and decay. In particular, I will detail the fabrication of the lithium-drifted Silicon detectors that are essential to its success. Lunch at 12:30 pm  
  Fall 2014:
Date Time Speaker Title Description Notes Slides
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