On the origin of high-energy cosmic neutrinos

Murase, Kohta

doi:10.1063/1.4915555

Cited by 48 publications

(42 citation statements)

References 104 publications

(148 reference statements)

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“…Another connected remark emerges comparing the flux of neutrinos with the IGRB (intergalactic gamma-ray background). The first step in this direction was done by Murase et al (2013) and Murase (2015), using the two-year data set of IceCube events. In this work the pp scenario is considered and the neutrino flux is compared to the diffuse γ-ray background flux measured by Fermi.…”

Section: Extragalactic Power Law Neutrinos Protons and γ-Raysmentioning

confidence: 99%

Extragalactic Plus Galactic Model for Icecube Neutrino Events

Palladino

Vissani

2016

ApJ

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The hypothesis that high-energy cosmic neutrinos are power law distributed is critically analyzed. We propose a model with two components that better explains the observations. The extragalactic component of the high-energy neutrino flux has a canonical n -E 2 spectrum while the galactic component has a n -E 2.7 spectrum; both of them are significant. This model has several implications, which can be tested by IceCube and ANTARES over the next several years. Moreover, the existence of a diffuse component, close to the Galactic plane and that yields (20-30)% of IceCube's events, is interesting for the future km 3 neutrino telescopes located in the Northern Hemisphere and for gamma-ray telescopes aiming to measure events up to a few 100 TeV from the southern sky.

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Section: Extragalactic Power Law Neutrinos Protons and γ-Raysmentioning

confidence: 99%

Extragalactic Plus Galactic Model for Icecube Neutrino Events

Palladino

Vissani

2016

ApJ

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“…The sources of these neutrinos are currently unknown, but they appear to be extragalactic in origin [9][10][11]. Gammaray bursts (GRBs), energetic supernovae (SNe), active galactic nuclei (AGNs), starburst and star-forming galaxies, galaxy groups and clusters, as well as some Galactic sources have been proposed as potential candidates (see reviews [12][13][14]). In particular, GRBs, which are believed to be caused by ultra-relativistic jets launched by the collapse of a massive star (i.e.…”

Section: Introductionmentioning

confidence: 99%

Choked jets and low-luminosity gamma-ray bursts as hidden neutrino sources

2016

Self Cite

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We consider gamma-ray burst (GRB) jets that are choked by extended material as sources of high-energy cosmic neutrinos. We take into account the jet propagation physics both inside the progenitor star and the surrounding dense medium. Radiation constraints, which are relevant for high-energy neutrino production are considered as well. Efficient shock acceleration of cosmic rays is possible for sufficiently low-power jets and/or jets buried in a dense, extended wind or outer envelope. Such conditions also favor GRB jets to become stalled, and the necessary conditions for stalling are explicitly derived. Such choked jets may explain transrelativistic supernovae (SNe) and low-luminosity (LL) GRBs, giving a unified picture of GRBs and GRB-SNe. Focusing on this unified scenario for GRBs, we calculate the resulting neutrino spectra from choked jets including the relevant microphysical processes such as multipion production in pp and pγ interactions, as well as the energy losses of mesons and muons. We obtain diffuse neutrino spectra using the latest results for the luminosity function of LL GRBs. Although uncertainties are large, we confirm that LL GRBs can potentially give a significant contribution to the diffuse neutrino flux. Our results are consistent with the present IceCube data and do not violate the stacking limits on classical highluminosity GRBs. We find that high-energy neutrino production in choked jets is dominated by pγ interactions. These sources are dark in GeV-TeV gamma-rays, and do not contribute significantly to the Fermi diffuse gamma-ray background. Assuming stalled jets can launch a quasi-spherical shock in the dense medium, "precursor" TeV neutrinos emerging prior to the shock breakout gamma-ray emission can be used as smoking gun evidence for a choked jet model for LL GRBs. Our results strengthen the relevance of wide field-of-view sky monitors with better sensitivities in the 1−100 keV range.PACS numbers: 95.85. Ry, 97.60.Bw, 98.70.Rz

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“…If the neutrinos are of normal hierarchy, then the "boost" factor is required to be 15 times larger, and the muon and tauon decays give rise to softer secondary electrons/positrons, which is less favored by the DAMPE data [30]. To be consistent, we have checked also the photons [79] and neutrinos [44] from the decays of H AEAE → l AE i l AE j involving muon and tauons, following [80,81]. As expected, these secondary particles are much softer than the electrons at 1.4 TeV, and the fluxes are orders of magnitude below the current astrophysical backgrounds.…”

Section: Dark Mattermentioning

confidence: 99%

Prospects of type-II seesaw models at future colliders in light of the DAMPEe+e−excess

Sui¹

2018

Phys. Rev. D

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The DAMPE e þ e − excess at around 1.4 TeV could be explained in the type-II seesaw model with a scalar dark mater D which is stabilized by a discrete Z 2 symmetry. The simplest scenario is the annihilation DD → H þþ H −− followed by the subsequent decay H AEAE → e AE e AE , with both the DM and triplet scalars roughly 3 TeV with a small mass splitting. In addition to the Drell-Yan process at future 100 TeV hadron colliders, the doubly charged components could also be produced at lepton colliders like ILC and CLIC in the off shell mode and mediate lepton flavor violating processes e þ e − → l AE i l ∓ j (with i ≠ j). A wide range of parameter space of the type-II seesaw could be probed, which are well below the current stringent lepton flavor constraints.

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On the origin of high-energy cosmic neutrinos

Cited by 48 publications

References 104 publications

Extragalactic Plus Galactic Model for Icecube Neutrino Events

Extragalactic Plus Galactic Model for Icecube Neutrino Events

Choked jets and low-luminosity gamma-ray bursts as hidden neutrino sources

Prospects of type-II seesaw models at future colliders in light of the DAMPEe+e−excess

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