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Creators/Authors contains: "Farrar, Glennys R"

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  1. ; (, PoS)
    We report on several new results using anisotropies of UHECRs. We improve and extend the work of Ding, Globus and Farrar, who modeled the UHECR dipole assuming sources follow the dark matter distribution, accounting for deflections in the Galactic and extragalactic magnetic fields but using a simplified treatment of interactions during propagation. The work presented here employs an accurate and self-consistent treatment of the evolution of composition during propagation, allows for and explores the impact of “bias” in the relation between UHECR sources and the dark matter distribution, and investigates the possible generation of arrival-direction-dependent composition anisotropies. Limits on the source number density consistent with the observed anisotropies are derived for the case where UHECR sources follow the dark matter distribution, and compared to a homogeneous source distribution case. 
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  2. ; (, Sissa Medialab)
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  3. ; (, The Astrophysical Journal Letters)
    Abstract Interactions of ultra-high-energy cosmic rays (UHECRs) in the surroundings of their accelerators can naturally explain the observed spectrum and composition of UHECRs, including the abundance of protons below the ankle. Here we show that astrophysical properties of the UHECR source environment such as the temperature, size, and magnetic field can be constrained by UHECR and neutrino data. Applying this to candidate sources with a simple structure shows that starburst galaxies are consistent with these constraints, but galaxy clusters are in tension with them. For multicomponent systems like active galactic nuclei and gamma-ray bursts, the results are indicative, but a customized analysis is needed for definitive conclusions. 
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  4. ; (, Journal of Cosmology and Astroparticle Physics)
    Abstract A rotation curve inequality that holds for spherically symmetric mass distributions is derived, and tested against the SPARC galaxy rotation curves dataset. We identify several Galaxies, e.g. NGC7793 and UGC11557, which are candidates for hosting non-spherical dark matter structures that could be detected by more precise measurements. 
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  5. ; ; (, Physical Review D)
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  6. ; (, The Astrophysical Journal Letters)
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  7. ; (, Proceedings of 37th International Cosmic Ray Conference - PoS(ICRC2021))
    null (Ed.)
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  8. ; (, Physical Review D)
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  9. ; ; (, The Astrophysical Journal Letters)
    null (Ed.)
    Full Text Available 
  10. ; ; (, Sissa Medialab)