scholarly journals AMBIGUITY IN SOURCE FLUX OF COSMIC/ASTROPHYSICAL NEUTRINOS: EFFECTS OF BI-MAXIMAL MIXING AND QUANTUM-GRAVITY INDUCED DECOHERENCE

2001 ◽  
Vol 16 (14) ◽  
pp. 917-925 ◽  
Author(s):  
D. V. AHLUWALIA
Keyword(s):  
Quantum Gravity ◽  
Neutrino Oscillations ◽  
Neutrino Flux ◽  
High Energy ◽  
Length Scale ◽  
Neutrino Detectors ◽  
Astrophysical Neutrinos ◽  
Cosmic Neutrino ◽  
Existing Data ◽  
Good Flavor

For high energy cosmic neutrinos Athar, Jeźabek, and Yasuda (AJY) have recently shown that the existing data on neutrino oscillations suggest that cosmic neutrino flux at the AGN/GRB source, F(νe):F(νμ):F(ντ) ≈ 1:2:0, oscillates to F(νe):F(νμ):F(ντ) ≈ 1:1:1. These results can be confirmed at AMANDA, Baikal, ANTARES and NESTOR, and other neutrino detectors with a good flavor resolution. Here, we rederive the AJY result from quasi bi-maximal mixing, and show that observation of F(νe):F(νμ):F(ντ) ≈ 1:1:1 does not necessarily establish cosmic neutrino flux at the AGN/GRB source to be F(νe):F(νμ):F(ντ) ≈ 1:2:0. We also note that if the length scale for the quantum-gravity induced decoherence for astrophysical neutrinos is of the order of a Mpc, then independent of the MNS matrix, the Liu–Hu–Ge (LHG) mechanism would lead to flux equalization for the cosmic/astrophysical neutrinos.

scholarly journals SEARCH FOR NEUTRINO EMISSION FROM GAMMA-RAY SOURCES WITH THE ANTARES TELESCOPE

2012 ◽  
Vol 08 ◽  
pp. 307-310
Author(s):  
C. BIGONGIARI
Keyword(s):  
Gamma Ray ◽  
Neutrino Flux ◽  
Three Dimensional ◽  
Effective Area ◽  
High Energy ◽  
Neutrino Telescope ◽  
Neutrino Detector ◽  
Upper Limits ◽  
Cosmic Neutrino ◽  
Promising Source

ANTARES is the first undersea neutrino detector ever built and presently the neutrino telescope with the largest effective area operating in the Northern Hemisphere. A three-dimensional array of photomultiplier tubes detects the Cherenkov light induced by the muons produced in the interaction of high energy neutrinos with the matter surrounding the detector. The detection of astronomical neutrino sources is one of the main goals of ANTARES. The search for point-like neutrino sources with the ANTARES telescope is described and the preliminary results obtained with data collected from 2007 to 2010 are shown. No cosmic neutrino source has been observed and neutrino flux upper limits have been calculated for the most promising source candidates.

scholarly journals Recent Results from the Antares Neutrino Telescope

2019 ◽  
Vol 207 ◽  
pp. 01001
Author(s):  
Antoine Kouchner
Keyword(s):  
Galactic Plane ◽  
Large Fraction ◽  
Neutrino Flux ◽  
High Energy ◽  
Neutrino Telescope ◽  
Point Sources ◽  
Joint Analysis ◽  
Neutrino Source ◽  
Cosmic Neutrino ◽  
The One

Antares, the first undersea neutrino telescope, has been continuously operating since 2007 in the Mediterranean Sea. The transparency of the water allows for a very good angular resolution in the reconstruction of neutrino events of all flavors. This results in an unmatched sensitivity for neutrino source searches, in a large fraction of the Southern Sky, at TeV energies. As a consequence, Antares provides valuable constraints on the origin of the cosmic neutrino flux discovered by the IceCube Collaboration. Based on an all-flavor dataset spanning nine years of operation of the detector, the latest results of Antares searches for neutrino point sources, and for diffuse neutrino emission from the entire sky as well as from several interesting regions such as the Galactic Plane, are presented. Several results have been obtained through a joint analysis with the IceCube Collaboration. Concerning the multi-messenger program, the focus is made on the follow-up searches of IceCube alerts, in particular the one related to the TXS 0506+056 blazar, thought to be the first extragalactic high-energy neutrino source identified so far.

scholarly journals High-energy neutrino interaction physics with IceCube

2019 ◽  
Vol 208 ◽  
pp. 09001
Author(s):  
Spencer Klein
Keyword(s):  
Standard Model ◽  
Cross Sections ◽  
Neutrino Flux ◽  
High Energy ◽  
Neutrino Interaction ◽  
Neutrino Telescopes ◽  
Neutrino Interactions ◽  
The Standard Model ◽  
Astrophysical Neutrinos ◽  
Neutrino Absorption

Although they are best known for studying astrophysical neutrinos, neutrino telescopes like IceCube can study neutrino interactions, at energies far above those that are accessible at accelerators. In this writeup, I present two IceCube analyses of neutrino interactions at energies far above 1 TeV. The first measures neutrino absorption in the Earth, and, from that determines the neutrino-nucleon cross-section at energies between 6.3 and 980 TeV. We find that the cross-sections are 1.30 +0.21 -0.19 (stat.) +0.39 -0.43 (syst.) times the Standard Model crosssection. We also present a measurement of neutrino inelasticity, using νμ charged-current interactions that occur within IceCube. We have measured the average inelasticity at energies from 1 TeV to above 100 TeV, and found that it is in agreement with the Standard Model expectations. We have also performed a series of fits to this track sample and a matching cascade sample, to probe aspects of the astrophysical neutrino flux, particularly the flavor ratio.

DETECTION OF NEUTRINOS FROM MICRO-QUASARS II

2012 ◽  
Vol 21 (10) ◽  
pp. 1250086
Author(s):  
MERCEDES ELISA MOSQUERA ◽  
OSVALDO CIVITARESE
Keyword(s):  
Neutrino Oscillations ◽  
Neutrino Flux ◽  
Compact Object ◽  
High Energy ◽  
Proton Emission ◽  
High Energy Proton ◽  
Proton Proton ◽  
Proton Collisions ◽  
Energy Proton ◽  
Proton Proton Collisions

Considering a system composed of a compact object and a star subrounded by wind, and using models for high-energy proton emission from micro-quasars, we calculate the neutrino flux resulting from proton–proton collisions, with and without including neutrino oscillations. It is found that the flux of neutrinos from a windy micro-quasar is affected by neutrino oscillations, and that it reflects upon the increase in the time of observation, by a factor of the order 2–3.

scholarly journals On the τ flavor of the cosmic neutrino flux

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Yasaman Farzan
Keyword(s):  
Dark Matter ◽  
Degrees Of Freedom ◽  
Neutrino Flux ◽  
High Energy ◽  
New Physics ◽  
Beyond The Standard Model ◽  
New Era ◽  
The Standard Model ◽  
Cosmic Neutrino ◽  
Standard Picture

Abstract Observation of high energy cosmic neutrinos by ICECUBE has ushered in a new era in exploring both cosmos and new physics beyond the Standard Model (SM). In the standard picture, although mostly νμ and νe are produced in the source, oscillation will produce ντen route. Certain beyond SM scenarios, like interaction with ultralight DM can alter this picture. Thus, the flavor composition of the cosmic neutrino flux can open up the possibility of exploring certain beyond the SM scenarios that are inaccessible otherwise. We show that the τ flavor holds a special place among the neutrino flavors in elucidating new physics. Interpreting the two anomalous events observed by ANITA as ντ events makes the tau flavor even more intriguing. We study how the detection of the two tau events by ICECUBE constrains the interaction of the neutrinos with ultralight dark matter and discuss the implications of this interaction for even higher energy cosmic neutrinos detectable by future radio telescopes such as ARA, ARIANNA and GRAND. We also revisit the 3 + 1 neutrino scheme as a solution to the two anomalous ANITA events and clarify a misconception that exists in the literature about the evolution of high energy neutrinos in matter within the 3 + 1 scheme with a possibility of scattering off nuclei. We show that the existing bounds on the flux of ντ with energy of EeV rules out this solution for the ANITA events. We show that the 3 + 1 solution can be saved from both this bound and from the bound on the extra relativistic degrees of freedom in the early universe by turning on the interaction of neutrinos with ultralight dark matter.

scholarly journals Multi-detector approach to enhance the sensitivity of neutrino telescopes to low-energy astrophysical sources

2021 ◽  
Vol 16 (12) ◽  
pp. C12012
Author(s):  
G. de Wasseige
Keyword(s):  
Energy Range ◽  
Neutrino Flux ◽  
High Energy ◽  
Low Energy ◽  
High Energy Neutrino ◽  
Neutrino Telescopes ◽  
Energy Neutrino ◽  
Astrophysical Neutrinos ◽  
Transient Sources ◽  
The Moment

Abstract While large neutrino telescopes have so far mainly focused on the detection of TeV-PeV astrophysical neutrinos, several efforts are ongoing to extend the sensitivity down to the GeV level for transient sources. Only a handful of neutrino searches have been carried out at the moment leaving the signature of astrophysical transients poorly known in this energy range. In this contribution, we discuss the motivations for high-energy neutrino telescopes to explore the GeV energy range and summarize the current limitations of detectors, such as IceCube and KM3NeT. We then present and compare different approaches for multi-detector analyses that may enhance the sensitivity to a transient GeV neutrino flux.

DETECTION OF NEUTRINOS FROM MICRO-QUASARS I

2012 ◽  
Vol 21 (10) ◽  
pp. 1250085
Author(s):  
OSVALDO CIVITARESE ◽  
MERCEDES ELISA MOSQUERA
Keyword(s):  
Neutrino Oscillations ◽  
Neutrino Flux ◽  
High Energy ◽  
Particle Emission ◽  
High Energy Particle ◽  
Neutrino Detector ◽  
Energy Particle ◽  
Low Mass

Using the neutrino intensity obtained from models for high-energy particle-emission from low-mass micro-quasars, we calculate the neutrino flux with and without including neutrino oscillations. We show that the neutrino flux from a micro-quasar is affected by neutrino oscillations. The effect reflects upon the increase in the time of observation, for km-scale neutrino detector.

scholarly journals Differential limit on the extremely-high-energy cosmic neutrino flux in the presence of astrophysical background from nine years of IceCube data

2018 ◽  
Vol 98 (6) ◽  
Author(s):  
M. G. Aartsen ◽  
M. Ackermann ◽  
J. Adams ◽  
J. A. Aguilar ◽  
M. Ahlers ◽  
...  
Keyword(s):  
Neutrino Flux ◽  
High Energy ◽  
Cosmic Neutrino
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