Cosmic neutrino background | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-08

This is an audio version of the Wikipedia Article:
Cosmic neutrino background


00:01:07 1 Derivation of the CνB temperature
00:04:49 2 Indirect evidence for the CνB
00:06:35 2.1 Big Bang nucleosynthesis
00:07:02 2.2 CMB anisotropies and structure formation
00:07:15 2.3 Indirect evidence from phase changes to the Cosmic Microwave Background (CMB)
00:07:26 3 Prospects for the direct detection of the CνB
00:08:34 4 See also
00:08:40 5 Notes
00:08:54 6 References
00:10:02 undefined
00:12:19 undefined
00:12:39 undefined



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- Socrates



SUMMARY
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The cosmic neutrino background (CNB, CνB[1]) is the universe's background particle radiation composed of neutrinos. They are sometimes known as relic neutrinos.
The CνB is a relic of the big bang; while the cosmic microwave background radiation (CMB) dates from when the universe was 379,000 years old, the CνB decoupled (separated) from matter when the universe was just one second old. It is estimated that today, the CνB has a temperature of roughly 1.95 K.
As neutrinos rarely interact with matter, these neutrinos still exist today. They have a very low energy, around 10−4 to 10−6 eV. Even high energy neutrinos are notoriously difficult to detect, and the CνB has energies around 10−10 times smaller, so the CνB may not be directly observed in detail for many years, if at all. However, Big Bang cosmology makes many predictions about the CνB, and there is very strong indirect evidence that the CνB exists.