From a thread on “void theory vs. acceleration” (link in quote below); Rather than hijack the other thread for more detail on a side topic, I’ve opened this new thread. I’m interested in how science hopes to use “Neutrino observatories”. I’ve not seen much on the hopeful physics of making these observations which I see as based on two parts 1) What we hope to observe and 2) How we hope to observe it. Fundamentally I assume somewhere between the Big Bang Time of t=0 and the 380,000 years for the time of Last Scattering for the CMB there is a time of Big Bang Neutrino Generation. This should have created a CNB (Cosmic Neutrino Background) with a surface larger than the SLS. Granting that detecting them is a major observational challenge, do we have some idea of what we should be looking for in those observations? That is during the time prior to SLS do current theories offer expectations of how many neutrinos should have been generated and when so as to define the size CNB surface, and how many neutrinos from a CNBS (Cosmic Neutrino Background Surface) should be expected now? I would expect that various current theoretical views of how to apply the Standard Model and Inflation during the time of Big Bang Plasma involved sould generate differences in theory predictions. In addition to how many are generate, an issue I see as in need of predicting is over what time period that CNB would be generated. Unlike the SLS being created during just a few thousand years creating a relatively “thin” observable surface; since neutrinos are very ‘transparent’ thus the observable CNB surface could be notably “thick”. Also, this Thick Surface of CNB would clearly be much larger than SLS prior to 500,000 years post Big Bang. However, since we seem to have pretty good confirmation that neutrinos do not travel at “c” the SLS photons at some point may catch up with and pass the CNBS. Meaning the observable CNBS by now might actually be smaller than the SLS. So to the question: Are there any peer reviewed speculations applying current theories addressing some of the components needed to define a CNB and what might be available to current observation of a CNBS? That should be a necessary base from which to design a system to observe those neutrinos.