Is the Total Spin of the Universe Truly Zero or Is There More to Explore?

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The discussion centers on whether the total spin of the universe is zero and explores the implications of angular momentum conservation. It raises questions about the spin symmetry of elementary particles and the potential for strange phenomena if this symmetry is broken. The conversation highlights that while total angular momentum should theoretically be zero, the existence of magnetic dipole moments suggests complexities in angular momentum components. It questions if there are only two quantized states of angular momentum, as the magnetic dipole moment appears to indicate a singular spin direction. The exploration of these concepts reveals deeper mysteries in the understanding of the universe's spin dynamics.
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Is the total spin of the universe zero? Clockwise? Counterclockwise?

Is the spin symmetry broken for elementary particles?
 
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The total angualr momentum should be zero, strange things satrt to happen when it's not. Spin does seem to be a universally conserved quantity.
 
jcsd said:
The total angualr momentum should be zero

But what about the components of angular momentum? Are there only two quantized states of the angular momentum? Clockwise and anticlockwise? But the magnetic dipole moment indicates otherwise. This moment cannot be canceled out. There seems to be only one spin direction for the magnetic dipole moment.
 

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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