Orodruin said:
I explicitly said the opposite of that.
This is ignorant. ”Cold neutrinos are dark matter” imply certain properties of said dark matter. Those properties are necessarily in conflict with what we know about the history of the Universe. It is not about having a favourite model, it is about having the properties that would make the dark matter cold neutrinos in the first place.
Ok, I read part of your comment wrong, that's my mistake, but your own personal take on what physics is all about doesn't actually answer my question so I don't think we should focus on that. I never said "cold neutrinos are dark matter" in fact I said the opposite, I said "I'm not even claiming that dark matter is composed of cold neutrinos". Perhaps I shouldn't have mentioned dark matter in the question in the first place. Once again, my question is simply: Have we measured the cold neutrino density in the universe?
Ok sure, that would be the next question: Do they have the same properties as dark matter? I would guess yes, but without a deeper personal investigation I wouldn't conclude that that's true. Perhaps the answer is no they don't for whatever reason that's not immediately obvious.
The reason why the data for the cold neutrino density question is my first question is because all of these other questions are a waste of time if we've already measured the cold neutrino density and used it to rule that out the idea that that's what dark matter is composed of. It may be true that cold neutrinos can't be dark matter for whatever reason, but answering that question for myself would almost certainly take a lot of time. With that in mind, it's clear that the first question to ask is: Have we measured the cold neutrino density in the universe?
There's no need to speak in a condescending manner by comparing ideas to unicorns and calling people ignorant, if I've offended you somehow, I apologize, although I'm not sure how I could have. There's nothing ignorant about recognizing the fact that models are theoretical, and that better models could exist. I'm not claiming that any specific idea about dark matter is true. Once again, I'm simply asking: Have we measured the cold neutrino density in the universe?