New Concept: Cosmic Neutrino Background

[BartlettAstro]

Name the new concept
Cosmic Neutrino Background (preferred)

Alternative terms:
CvB
Relic neutrinos
CNB

Describe the concept

"The theoretical low-energy neutrinos that decoupled from the rest of matter about two seconds after the Big Bang when the temperature dropped to approximately 2.5 MeV (redshift of z ~ 6 ×109). The CNB is similar to the cosmic microwave background (CMB), but older. It is estimated that today the CNB has a temperature of Tν = (4/11)1/3Tγ, ~ 1.95 K (or 1.67 × 10-4 eV), where Tγ is the CMB temperature of 2.728 K."
An Etymological Dictionary of Astronomy and Astrophysics, by M. Heydari-Malayeri

may actually be alternative name for Cosmological neutrinos (https://astrothesaurus.org/uat/338) or these could be closely related terms; we should check with someone who works in this area before adding a new term or expanding the existing one

Related terms
Neutrino astronomy(https://uat.astrothesaurus.org/uat/1100)
Neutrino telescopes(https://uat.astrothesaurus.org/uat/1105)
Cosmic microwave background radiation[(https://astrothesaurus.org/uat/322)(https://astrothesaurus.org/uat/322)

Describe where the concept fits within the existing hierarchy

Broader concepts:
Cosmic background radiation(https://astrothesaurus.org/uat/317)
Neutrino decoupling(https://astrothesaurus.org/uat/1101)

Narrower concepts:
None

Provide 1-3 supporting articles
(https://www.scixplorer.org/search?q=full%3A%22neutrino+background%22&sort=score+desc&sort=date+desc&p=1)

Please include any additional comments/feedback
Addition of non microwave background radiation in response to #480