1,325 research outputs found
Cosmic neutrinos at IceCube: , and initial flavor composition
We discuss the prospect of extracting the values of the mixing parameters
and through the detection of cosmic neutrinos in the
planned and forthcoming neutrino telescopes. We take the ratio of the
muon-track to shower-like events, R, as the realistic quantity that can be
measured in the neutrino telescopes. We take into account several sources of
uncertainties that enter the analysis. We then examine to what extent the
deviation of the initial flavor composition from w_e:w_\mu:w_\tau=1:2:0 can be
tested.Comment: 3 pages, 2 figures, Talk given at the TAUP 2009 conference, Rome,
Italy; J. Phys. Conf. Series to appea
Pseudo-Dirac Neutrino Scenario: Cosmic Neutrinos at Neutrino Telescopes
Within the "pseudo-Dirac" scenario for massive neutrinos the existence of
sterile neutrinos which are almost degenerate in mass with the active ones is
hypothesized. The presence of these sterile neutrinos can affect the flavor
composition of cosmic neutrinos arriving at Earth after traveling large
distances from astrophysical objects. We examine the prospects of neutrino
telescopes such as IceCube to probe the very tiny mass squared differences
10^(-12) eV^2<\Delta m^2<10^(-19) eV^2, by analyzing the ratio of -track
events to shower-like events. Considering various sources of uncertainties
which enter this analysis, we examine the capability of neutrino telescopes to
verify the validity of the pseudo-Dirac neutrino scenario and especially to
discriminate it from the conventional scenario with no sterile neutrino. We
also discuss the robustness of our results with respect to the uncertainties in
the initial flavor ratio of neutrinos at the source.Comment: 24 pages, 5 figure
A conceptual framework for transportation research at Mississippi Test Facility of NASA
Constructing models of transportation system in U
Measurement of spray combustion processes
A free jet configuration was chosen for measuring noncombusting spray fields and hydrocarbon-air spray flames in an effort to develop computational models of the dynamic interaction between droplets and the gas phase and to verify and refine numerical models of the entire spray combustion process. The development of a spray combustion facility is described including techniques for laser measurements in spray combustion environments and methods for data acquisition, processing, displaying, and interpretation
Wiggles in the cosmic microwave background radiation: echoes from non-singular cyclic-inflation
In this paper we consider a unique model of inflation where the universe
undergoes rapid asymmetric oscillations, each cycle lasting millions of Planck
time. Over many-many cycles the space-time expands to mimic the standard
inflationary scenario. Moreover, these rapid oscillations leave a distinctive
periodic signature in ln(k) in the primordial power spectrum, where k denotes
the comoving scale. The best fit parameters of the cyclic-inflation model
provides a very good fit to the 7-year WMAP data.Comment: Computational details and a figure adde
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