Bulletin of the American Physical Society
APS April Meeting 2016
Volume 61, Number 6
Saturday–Tuesday, April 16–19, 2016; Salt Lake City, Utah
Session X2: Cosmic Neutrinos and New PhysicsInvited
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Sponsoring Units: DPF DAP Chair: John Beacom, Ohio State University Room: Ballroom A |
Tuesday, April 19, 2016 10:45AM - 11:21AM |
X2.00001: Measuring Neutrinos with Cosmology Invited Speaker: Lloyd Knox Along with a thermal distribution of photons, we expect a thermal distribution of neutrinos to have been produced in the big bang. Although direct detection of the cosmic neutrino background (CNB) is extremely difficult, if not impossible, there is much we are learning indirectly about the CNB from its gravitational influences. I will review constraints from cosmic microwave background observations on the energy density in the CNB, present a recent detection of supersonic evolution of density perturbations in the CNB, and discuss constraints on neutrino masses from cosmological observables. I will also look toward what we can expect from future cosmological surveys, such as CMB-S4. [Preview Abstract] |
Tuesday, April 19, 2016 11:21AM - 11:57AM |
X2.00002: Results from the Search for eV-Sterile Neutrinos with IceCube Invited Speaker: Carlos Arg\"uelles Delgado The IceCube neutrino telescope at the South Pole has measured the atmospheric muon neutrino spectrum as a function of zenith angle and energy. We have performed a search for eV-scale sterile neutrinos by looking at distortion in those distributions. Such a sterile neutrino, motivated by the anomalies in short-baseline experiments, is expected to have a significant signature in the {\$}$\backslash $bar\textbraceleft $\backslash $nu\textunderscore $\backslash $mu\textbraceright {\$} survival probability due to matter induced resonant effects for energies of order 1 TeV. This effect makes this search unique and sensitive to small sterile mixings. In this talk, I will present the results of the IceCube sterile neutrino search. [Preview Abstract] |
Tuesday, April 19, 2016 11:57AM - 12:33PM |
X2.00003: Tests of new physics with astrophysical neutrinos Invited Speaker: Mauricio Bustamante Neutrino telescopes have started to prove their value as instruments for precision particle physics. High-energy astrophysical neutrinos, recently discovered by IceCube, provide an opportunity to look for new physics at previously unexplored energies -- from tens of TeV to a few PeV, far beyond the reach of laboratory experiments. Because of cosmological-scale baselines -- Mpc to Gpc -- tiny new physics effects, otherwise unobservable, could accumulate up to observable levels. Effects include, for instance, neutrino decay, violation of fundamental symmetries, and exotic neutrino-neutrino interactions. I will show that the flavor composition and spectrum of neutrinos may reveal the presence of new physics and its type. Present-day data -- tens of astrophysical neutrino events -- are already sensitive to some of them. More statistics, improvements in detection techniques, and future detector upgrades will improve the sensitivity. [Preview Abstract] |
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