Antineutrinos After Big Bang: Where Are They?

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Right after the big bang a gas consisting of many elementary particles, including neutrinos and antineutrinos was produced. I know that the neutrinos decoupled and are believed to form a universal gas presently at about 2K. What happened to the anti-neutrinos?

Thanks
 
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Actually one of the major questions in cosmology is what happened to all the antimatter of ALL types that should have been produced after the big bang. Why is there more matter than antimatter? I'm not sure if we have a good answer yet.
 
The current hypothesis is symetry breaking is the 'bad guy'.
 
tut_einstein said:
Right after the big bang a gas consisting of many elementary particles, including neutrinos and antineutrinos was produced. I know that the neutrinos decoupled and are believed to form a universal gas presently at about 2K. What happened to the anti-neutrinos?

Thanks
When people say neutrinos, you can expect they mean anti-neutrinos as well. The neutrinos and anti-neutrinos would have been produced in nearly equal amounts.
 

Thread 'Matter density right after the decoupling'

https://en.wikipedia.org/wiki/Recombination_(cosmology) Was a matter density right after the decoupling low enough to consider the vacuum as the actual vacuum, and not the medium through which the light propagates with the speed lower than ##({\epsilon_0\mu_0})^{-1/2}##? I'm asking this in context of the calculation of the observable universe radius, where the time integral of the inverse of the scale factor is multiplied by the constant speed of light ##c##.
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Thread 'Rutgers finds a transparent Einstein Cross - apparently a dark matter "halo".'

The formal paper is here. The Rutgers University news has published a story about an image being closely examined at their New Brunswick campus. Here is an excerpt: Computer modeling of the gravitational lens by Keeton and Eid showed that the four visible foreground galaxies causing the gravitational bending couldn’t explain the details of the five-image pattern. Only with the addition of a large, invisible mass, in this case, a dark matter halo, could the model match the observations...
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Thread 'Big Bang and Infinite Universe'

Hi, I’m pretty new to cosmology and I’m trying to get my head around the Big Bang and the potential infinite extent of the universe as a whole. There’s lots of misleading info out there but this forum and a few others have helped me and I just wanted to check I have the right idea. The Big Bang was the creation of space and time. At this instant t=0 space was infinite in size but the scale factor was zero. I’m picturing it (hopefully correctly) like an excel spreadsheet with infinite...
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