
TL;DR
This paper investigates the possibility of a rotating universe within the standard cosmological model by deriving a perturbed metric, constraining the rotation speed using cosmic microwave background data, and providing the first such limit for a shear-free b5bcdm universe.
Contribution
It derives the general form of a rotating perturbation in a flat b5bcdm universe and constrains the rotation speed using CMB anisotropy data.
Findings
Rotation speed constrained to less than 10^{-9} rad yr^{-1} at last scattering
First constraint on shear-free rotation in b5bcdm universe
Rotation unlikely to be the origin of non-Gaussian CMBA features
Abstract
Models of a rotating universe have been studied widely since G{\"o}del \cite{1}, who showed an example that is consistent with General Relativity (GR). By now, the possibility of a rotating universe has been discussed comprehensively in the framework of some types of Bianchi's models, such as Type V, VII and IX \cite{2,3}, and different approaches have been proposed to constrain the rotation. Recent discoveries of some non-Gaussian properties of the Cosmic Microwave Background Anisotropies (CMBA) \cite{nG1,nG2,nG3,nG4,nG5,nG6,nG7}, such as the suppression of the quadrupole and the alignment of some multipoles draw attention to some Bianchi models with rotation \cite{bi1,bi2}. However, cosmological data, such as those of the CMBA, strongly prefer a homogeneous and isotropic model. Therefore, it is of interest to discuss the rotation of the universe as a perturbation of the…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
