I refer to this: https://physicsworld.com/a/was-the-universe-born-spinning/ (shortly: as galaxies prefer, by 7%, to spin in a counter-clockwise direction, it means that the overall universe should have a rather large net angular momentum. Since angular momentum is conserved, it seems it [the universe] must have been “born” spinning.).

Two questions:

1. Can big bang spin explain slight flatness of Universe?

2. Can somebody calculate, what was the spin speed?

 

Thanks,

Kaido

 

9 minutes ago, loidokaar said:

1. Can big bang spin explain slight flatness of Universe?

Firstly, the "flatness" of the universe is not like the Earth being slightly flattened by its rotation. It is a description of the geometry of the universe (for example, that all the angles in a. triangle add to exactly 180°).

Second, the universe is extremely flat. It is perfectly flat, within the limits of our measurements. 

http://curious.astro.cornell.edu/about-us/103-the-universe/cosmology-and-the-big-bang/geometry-of-space-time/606-how-can-the-universe-be-flat-we-re-3d-beginner

13 minutes ago, loidokaar said:

2. Can somebody calculate, what was the spin speed?

Not me!

(BTW that result about the bias in the spin of galaxies has not been confirmed [or refuted] so I wouldn't put too much faith in it yet.)

A spinning universe would not be homogeneous and isotropic. This was theorized in the Godel universe model but the upper bounds of a spinning universe remaining homogeneous and isotropic are far too restrictive.

7 minutes ago, Mordred said:

A spinning universe would not be homogeneous and isotropic. This was theorized in the Godel universe model but the upper bounds of a spinning universe remaining homogeneous and isotropic are far too restrictive.

Can something that is "Everything that exists" have angular momentum (spin) since it would need to have something to relate it to? Would it not imply that it was inside some greater structure/volume.

Edited July 7, 20196 yr by StringJunky

It is viable to have an infinite universe with an inherent net angular momentum. Strange as that may seem. However naturally we are limited in our examination of our observable portion which shows according to best observational data any such rotation which would affect mass distributions which would be apparent in the CMB BAO datasets. It is this data that is primarily used to apply the restrictions  for the upper bounds to the rate of rotation

 

As Strange noted above the universe geometry refers to how light paths are affected by the universe geometry. The flatness is not a statement with regards to the distribution of galaxies and LSS 

1 hour ago, Mordred said:

It is viable to have an infinite universe with an inherent net angular momentum. Strange as that may seem. However naturally we are limited in our examination of our observable portion which shows according to best observational data any such rotation which would affect mass distributions which would be apparent in the CMB BAO datasets. It is this data that is primarily used to apply the restrictions  for the upper bounds to the rate of rotation

 

As Strange noted above the universe geometry refers to how light paths are affected by the universe geometry. The flatness is not a statement with regards to the distribution of galaxies and LSS 

OK. Cheers.