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Wait did nobody seriously consider rotation yet? Everything is rotating. Angular momentum is conserved.
by hoseja 1y ago
Wait did nobody seriously consider rotation yet? Everything is rotating. Angular momentum is conserved.
- jvanderbot 1y agoIsotropy is a fundamental assumption that is very hard to let go of.
- exe34 1y agoWhere would the axis of rotation be?
- nodfyr 1y agoThat would imply a preferred direction in the universe (the axis of rotation) and thus anisotropy. There are stringent constraints on anisotropy from the cosmic microwave background. In particular, one can use the Doppler effect to check whether the CMB dipole is compatible with our velocity with respect to the CMB frame.
- gitaarik 1y agoWell, the universe has an axis, found in the CMB: https://en.m.wikipedia.org/wiki/Axis_of_evil_(cosmology) https://en.m.wikipedia.org/wiki/Axis_of_evil_(cosmology)
- jfengel 1y agoThe article says right up front that the universe does not have an axis: However, a 2016 study compared isotropic and anisotropic cosmological models against WMAP and Planck data and found no evidence for anisotropy.
- gitaarik 1y agoThat was only one observation, most of the observations do indicate there is an axis
- lumost 1y agoRotation implies a great many observables and properties of the universe. There would be a cosmic axis, which implies a cosmic center and a cosmic north. Both concepts that are problematic in an infinite universe. If the universe is in fact inside of a black hole of a different universe - some of these problems go away as the Hubble volume would be the finite boundary of the universe.
- exe34 1y agoand we would be at the center?
- theoreticalmal 1y agoMy dog is quite sure she’s at the center, if we’re trying to be specific
- shermantanktop 1y agoMain Character Energy? My cat has that too.
- layer8 1y agoThe center of a black hole lies in the future. It’s called a singularity, and the equations of general relativity break down at it. So no, we are not at the center.
- gitaarik 1y agoYeah, we are. https://en.m.wikipedia.org/wiki/Axis_of_evil_(cosmology) https://en.m.wikipedia.org/wiki/Axis_of_evil_(cosmology)
- AnimalMuppet 1y agoAre we in an infinite universe? I thought the current thinking was that it was finite but unbounded; that is, that it curved back on itself.
- 1y ago