Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session H9: Invited Session: Astrophysical and Cosmological Neutrinos |
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Sponsoring Units: DAP DPF Chair: Lloyd Knox, University of California, Davis Room: Key 5 |
Sunday, April 12, 2015 8:30AM - 9:06AM |
H9.00001: New Prospects for Neutrino Astronomy in Underground Laboratories Invited Speaker: John Beacom A variety of kton-scale neutrino experiments are operating, under construction, or planned for underground laboratories around the world. The key scientific goals include tests of fundamental neutrino properties using distant reactor or accelerator sources. I consider the prospects of these experiments for detecting astrophysical neutrinos --- from the Sun, a Milky Way supernova, the diffuse supernova neutrino background, or even more exotic sources --- and what this could reveal about both physics and astrophysics. [Preview Abstract] |
Sunday, April 12, 2015 9:06AM - 9:42AM |
H9.00002: Cosmological Constraints on Neutrinos Invited Speaker: Marius Millea The cosmic background of neutrinos (the CNB) created during the big bang has been definitively detected via its gravitational influence. Ongoing measurements are now giving increasingly precise answers to questions such as 1) what is the energy density contained in the CNB? 2) what are the masses of the particles making up the CNB? and 3) are these particles really neutrinos, e.g. do they free-stream like neutrinos? I will discuss answers to these questions from cosmological probes such as baryon acoustic oscillations or local Hubble constant measurements, and with particular focus on the Planck 2015 cosmic microwave background results. One possibility I will explore is if axions of axion-like particles can be masquerading as a component of the CNB. Recent improvements from Planck and from big bang nucleosynthesis measurements have been placing increasingly tight constraints on this scenario. [Preview Abstract] |
Sunday, April 12, 2015 9:42AM - 10:18AM |
H9.00003: Observation of high energy neutrinos with IceCube Invited Speaker: Albrecht Karle High energy cosmic rays have been observed up to extremely high energies of more than 10$^{20}$ eV. The mechanism of their acceleration and their sources are, however, still largely unknown. Numerous scenarios suggest that neutrinos are produced in collisions of cosmic rays with matter or radiation fields in the source region. Because neutrinos are neither absorbed nor deflected, they will point directly back to their sources making them a unique tool for high energy particle astronomy. The IceCube neutrino detector at the South Pole, in full operation since 2011, uses more than a billion tons of natural ice as a target for neutrino detection. More than 50,000 atmospheric neutrinos at the TeV energy scale are being detected per year. The first several years of data have provided compelling evidence for a flux of neutrinos of astrophysical origin. The data include the detection of tens of neutrinos per year with energies above 10$^{14}$ eV - the highest energy leptons ever observed. The data are consistent with expectations from an extragalactic neutrino flux, however a galactic contribution cannot be excluded with current data. I will review the recent findings obtained with IceCube and compare data with expectations. New strategies such as multimessenger approaches where data from IceCube are correlated with observations of gamma rays and other telescope data will be discussed. [Preview Abstract] |
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