Pierre Auger Observatory and Telescope Array: Joint Contributions to the 35th International Cosmic Ray Conference (ICRC 2017)

Collaboration, The Telescope Array; Collaboration, The Pierre Auger

doi:10.48550/arxiv.1801.01018

Cited by 6 publications

(9 citation statements)

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“…Despite of these differences, a remarkable agreement in the energy scale of the two observatories is found up to about 10 19.4 eV. As demonstrated in Figure 3 (left panel) [22], re-scaling the energy scale of each experiment by only 5.2 %, which is well within the aforementioned systematic uncertainties of the two experiments, provides an excellent agreement of their measured fluxes. However, above this energy, larger differences remain present, which cannot be accounted for by an independent scaling of their reconstructed energies.…”

Section: Open Questions In Cosmic-ray Research At Ultrahigh Energiessupporting

confidence: 63%

Open Questions in Cosmic-Ray Research at Ultrahigh Energies

Batista

Biteau

Bustamante

et al. 2019

Front. Astron. Space Sci.

211

119

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We review open questions and prospects for progress in ultrahigh-energy cosmic ray (UHECR) research, based on a series of discussions that took place during the "The High-Energy Universe: Gamma-Ray, Neutrino, and Cosmic-ray Astronomy" MIAPP workshop in 2018. Specifically, we overview open questions on the origin of the bulk of UHECRs, the UHECR mass composition, the origin of the end of the cosmic-ray spectrum, the transition from Galactic to extragalactic cosmic rays, the effect of magnetic fields on the trajectories of UHECRs, anisotropy expectations for specific astrophysical scenarios, hadronic interactions, and prospects for discovering neutral particles as well as new physics at ultrahigh energies. We also briefly overview upcoming and proposed UHECR experiments and discuss their projected science reach.

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Section: Open Questions In Cosmic-ray Research At Ultrahigh Energiessupporting

confidence: 63%

Open Questions in Cosmic-Ray Research at Ultrahigh Energies

Batista

Biteau

Bustamante

et al. 2019

Front. Astron. Space Sci.

211

119

View full text Add to dashboard Cite

show abstract

“…An additional compensation can be picked up by using also the Telescope Array (TA) observations. TA has accumulated an exposure ∼ 8, 300 km 2 sr yr without observation of events above 10 11.3 GeV [89]. After removing the band of declination common to both experiments this becomes a ∼ 10% effect.…”

Section: New Limit On the Lifetime Of Shdmmentioning

confidence: 99%

Hunting for superheavy dark matter with the highest-energy cosmic rays

2019

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In 15 years of data taking the Pierre Auger Observatory has observed no events beyond 10 11.3 GeV. This null result translates into an upper bound on the flux of ultrahigh-energy cosmic rays implying J(> 10 11.3 GeV) < 3.6 × 10 −5 km −2 sr −1 yr −1 , at the 90%C.L. We interpret this bound as a constraint on extreme-energy photons originating in the decay super-heavy dark matter (SHDM) particles clustered in the Galactic halo. Armed with this constraint we derive the strongest lower limit on the lifetime of hadronically decaying SHDM particles with masses in the range, 10 14 M X /GeV 10 16 . We also explore the capability of future NASA's POEMMA mission to search for SHDM signals.2 Investigations in String Theory have applied a statistical approach to the enormous "landscape" of vacua present in the theory [37]. Remarkably, these huge number of metastable vacua, O(10 500 ), can also accommodate the more severe fine-tuning required to characterize the SM with a small cosmological constant [40,41].

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“…However, there may be a significant statistical discrepancy in the energy spectra between Auger and TA around the suppression energy. The TA results show a relatively higher flux, and the reason is still unclear yet [106]. In this section, we aim to fit the energy spectrum and composition of UHECR nuclei detected by Auger [38] and TA [107,108].…”

Section: B Comparison With Auger and Ta Datamentioning

confidence: 99%

Ultrahigh-energy cosmic-ray nuclei and neutrinos from engine-driven supernovae

Zhang

Murase

2019

Phys. Rev. D

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Transrelativistic supernovae (SNe), which are likely driven by central engines via jets or winds, have been among candidate sources of ultrahigh-energy cosmic rays (UHECRs). We investigate acceleration and survival of UHECR nuclei in the external reverse shock scenario. With composition models used in Zhang et al. (2018), we calculate spectra of escaping cosmic rays and secondary neutrinos. If their local rate is ∼ 1% of the core-collapse supernova rate, the observed UHECR spectrum and composition can be explained with the total cosmic-ray energy Ecr ∼ 10 51 erg. The maximum energy of UHECR nuclei can reach ∼ 10 20 − 10 21 eV. The diffuse flux of source neutrinos is predicted to be ∼ 10 −11 − 10 −10 GeV cm −2 s −1 sr −1 in the 0.1-1 EeV range, satisfying nucleussurvival bounds. The associated cosmogenic neutrino flux is calculated, and shown to be comparable or even higher than the source neutrino flux. These ultrahigh-energy neutrinos can be detected by ultimate detectors such as the Giant Radio Askaryan Neutrino Detector and Probe Of Extreme Multi-Messenger Astrophysics.

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Pierre Auger Observatory and Telescope Array: Joint Contributions to the 35th International Cosmic Ray Conference (ICRC 2017)

Cited by 6 publications

References 0 publications

Open Questions in Cosmic-Ray Research at Ultrahigh Energies

Open Questions in Cosmic-Ray Research at Ultrahigh Energies

Hunting for superheavy dark matter with the highest-energy cosmic rays

Ultrahigh-energy cosmic-ray nuclei and neutrinos from engine-driven supernovae

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