English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We have studied the consequences of breaking the CPT symmetry in the neutrinosector, using the expected high-energy neutrino flux from distant cosmologicalsources such as active galaxies. For this purpose we have assumed threedifferent hypotheses for the neutrino production model, characterised by theflavour fluxes at production \phi_e^0:\phi_\mu^0:\phi_\tau^0 = 1:2:0, 0:1:0,and 1:0:0, and studied the theoretical and experimental expectations for themuon-neutrino flux at Earth, \phi_\mu, and for the flavour ratios at Earth, R =\phi_\mu/\phi_e and S = \phi_\tau/\phi_\mu. CPT violation (CPTV) has beenimplemented by adding an energy-independent term to the standard neutrinooscillation Hamiltonian. This introduces three new mixing angles, two neweigenvalues and three new phases, all of which have currently unknown values.We have varied the new mixing angles and eigenvalues within certain bounds,together with the parameters associated to pure standard oscillations. Ourresults indicate that, for the models 1:2:0 and 0:1:0, it might possible tofind large deviations for \phi_\mu, R, and S between the cases without and withCPTV, provided the CPTV eigenvalues lie within 10^{-29}-10^{-27} GeV, or above.Moreover, if CPTV exists, there are certain values of R and S that can beaccounted for by up to three production models. If no CPTV were observed, wecould set limits on the CPTV eigenvalues of the same order. Detection prospectscalculated using IceCube suggest that for the models 1:2:0 and 0:1:0, themodifications due to CPTV are larger and more clearly separable from thestandard-oscillations predictions. We conclude that IceCube is potentially ableto detect CPTV but that, depending on the values of the CPTV parameters, therecould be a mis-determination of the neutrino production model.

Energy-independent new physics in the flavour ratios of high-energy astrophysical neutrinos