Re: [Phys-L] As the universe turns,

[Larry Smith <Larry.Smith@snow.edu>]

This answer is helpful.

Does anyone have thoughts about the secondary question?
> P.S. Apparently there is controversy about whether there is an observed bias in the direction of spin of surveyed spiral galaxies; if it were so and general, what would that imply about non-zero angular momentum for the whole universe?

Thanks,
Larry




> On Sep 6, 2024, at 11:45 AM, Zani, Gerald via Phys-l <phys-l@mail.phys-l.org> wrote:
>
> I bumped into my friendly Astrophysicist at lunch and asked, "Is the
> Universe Rotating?"
> I will paraphrase his response; It could be rotating, but the rotation is
> zero. The universe is Isotropic. The metric for the universe is uniform in
> every direction. If it were rotating then it would have some preferred
> axis. The Models of a rotating universe are called Bianchi's models, and a
> rotating universe is called a Bianchi Universe, after the Italian
> mathematician Luigi Bianchi.
> The properties of the Cosmic Microwave Background Anisotropies (CMBA)
> suggest some possible Bianchi models with rotation. However the
> cosmological data gives this rotation as zero. So the universe has a
> homogeneous, isotropic model. No rotation.
> https://en.wikipedia.org/wiki/Luigi_Bianchi
> - JZ
>
> --
> Gerald Zani
> Senior Engineering Technician
> Brown University School of Engineering
> (401) 863-9571
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