Copernican Paradigm beyond FLRW

We present the dipole cosmological principle, i.e., the notion that the Universe is a Copernican cosmology that agrees with the cosmic flow. It suits the most symmetric paradigm that generalizes the Friedmann-Lemaitre-Robertson-Walker ansatz in the context of numerous suggestions that have appeared in the literature for non-kinematic components in the cosmic microwave background dipole. Field equations in our dipole cosmology are still ODEs, but we now have four instead of two Friedmann equations. The two extra functions can be regarded as additional scale factors that break the isotropy group from SO(3) to U(1) and a tilt that denotes the cosmic flow. The result is an axially isotropic Universe. We examined the dynamics of the expansion rate, anisotropic shear, and tilt in some cases. One important observation is that the cosmic flow (tilt) can grow while the anisotropy (shear) dies down.

Automated summary

We propose the dipole cosmological principle which suggests that the Universe is a Copernican cosmology consistent with the cosmic flow. This principle generalizes the Friedmann-Lemaitre-Robertson-Walker ansatz and addresses the presence of non-kinematic components in the cosmic microwave background dipole. Our dipole cosmology introduces two additional functions that break the isotropy group and represent an additional scale factor and a tilt denoting the cosmic flow. In some cases, we find that the cosmic flow can grow while the anisotropy dies down.