Talk:Ultra-high-energy cosmic ray

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Iron Nuclei

I've edit out the parts where it says that it's a proton, and replaced it with Iron Nuclei because of this article: the team has found evidence that these highest-energy cosmic rays might be iron nuclei, rather than the protons that make up most cosmic rays. http://www.nature.com/news/2010/100222/full/4631011a.html

Michel_sharp (talk) 23:10, 21 June 2015 (UTC+01:00)

10^20 ev corresponds to 7.7 * 10^23 kelvins

2* 10^20 ev/(3*Boltzmann's constant) = 7.7 * 10^23 kelvins

http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/timlin.html

Just granpa (talk) 18:49, 8 December 2016 (UTC)[reply]

Relation with dark matter

It may be worth mentioning that the candidate dark matter particle mass -- 15 times the proton mass, or 1.4e10 eV -- has been excluded by later research. For example, Calmet & Kuipers^[1] use quantum gravity to show that a particle heavier than about 1e7 eV needs to either interact with photons (hence not dark) or decay on a timescale shorter than the age of the universe (hence not a candidate for dark matter in today's universe).

But I'm not sure how to work this in or if this is even appropriate so I'm just leaving this here. - CRGreathouse (t | c) 13:30, 12 October 2021 (UTC)[reply]

References

^ Xavier Calmet and Folkert Kuipers, Theoretical bounds on dark matter masses, Physics Letters B, Volume 814 (2021), https://doi.org/10.1016/j.physletb.2021.136068 or https://www.sciencedirect.com/science/article/pii/S0370269321000083

Extreme-energy cosmic ray

None of the sources refer to "Extreme-energy cosmic ray" by that term. The content related to that term does not match the article topic.

This article is about UHECR "Astrophysicists ponder whether ultrahigh-energy particles really do come from the centre of galaxies." Hand, E (22 February 2010). "Cosmic-ray theory unravels". Nature. 463 (7284): 1011. doi:10.1038/4631011a. PMID 20182484.
These are is about a hypothetical source, only one of many Honda, M.; Honda, Y. S. (2004). "Filamentary Jets as a Cosmic-Ray "Zevatron"". The Astrophysical Journal Letters. 617 (1): L37 – L40. arXiv:astro-ph/0411101. Bibcode:2004ApJ...617L..37H. doi:10.1086/427067. S2CID 11338689. Osmanov, Z.; Mahajan, S.; Machabeli, G.; Chkheidze, N. (2014). "Extremely efficient Zevatron in rotating AGN magnetospheres". Monthly Notices of the Royal Astronomical Society. 445 (4): 4155–4160. arXiv:1404.3176. Bibcode:2014MNRAS.445.4155O. doi:10.1093/mnras/stu2042. S2CID 119195822.

I deleted the EECR section. Johnjbarton (talk) 22:30, 11 November 2024 (UTC)[reply]

Thank you for explaining the rationale for deletion here, John, since it again included one of my recent edits. 24.19.113.134 (talk) 23:03, 11 November 2024 (UTC)[reply]

[1] Xavier Calmet and Folkert Kuipers, Theoretical bounds on dark matter masses, Physics Letters B, Volume 814 (2021), https://doi.org/10.1016/j.physletb.2021.136068 or https://www.sciencedirect.com/science/article/pii/S0370269321000083

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