This article reveal that the origin of gamma rays and cosmic neutrinos would potentially be the same. And the recent analysis indicates that blazars dominate the Fermi diffuse flux. Maybe they both come from the blazars. And the key point is that we can also find the signal of lower-mass dark matter particles. Are there other possibilities of the origin of cosmic neutrins?
Hi Tianyou,
Another possibility is the innermost regions of AGNs where the CRs can be accelerated by magnetic reconnection. Please take a look at this paper:
https://academic.oup.com/mnras/article/455/1/838/985908/High-energy-neutrino-emission-from-the-core-of-low?searchresult=1
Regards,
Behrouz
https://academic.oup.com/mnras/article/455/1/838/985908/High-energy-neutrino-emission-from-the-core-of-low?searchresult=1
Kartick: The question title should be "What is the possible origin of high energy Cosmic Neutrinos?" because the attached article bears exclusively high energy neutrinos (>>MeV), so excluding the most numerous ones, the cosmic backgroung neutrinos that you mentioned made ~1 sec after the big bang by the electron-positron anihilations.
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