4 papers
Gauge Invariant Frames of Bianchi Models in Separated Form
Dave B. H. Verweg, Robbert W. Scholtens
Bianchi spacetimes are usually written in separated form: metric coefficients depend only on cosmic time, while spatial dependence is carried by an invariant coframe. In this repre…
Exploring the CMB in Anisotropic Universes
Robbert W. Scholtens, Marcello Seri, Holger Waalkens +1
In recent years, there have been increasing challenges to the cosmological principle, based on new observations of e.g. supernovae and the cosmic bulk flow. As a result, the cosmol…
Fundamental Cosmic Anisotropy and its Ramifications II: Perturbations in Bianchi spacetimes, and fixed in the Newtonian gauge
Robbert W. Scholtens, Marcello Seri, Holger Waalkens +1
The standard cosmological model is challenged by an ever-growing collection of observations, which invites (and stimulates) inquiry into possible additions and/or alterations. One…
Fundamental Cosmic Anisotropy and its Ramifications I: Killing vector fields and constructing their metric
Robbert W. Scholtens, Marcello Seri, Holger Waalkens +1
On the largest scales, the universe appears to be almost homogeneous and isotropic, adhering to the cosmological principle. In contrast, on smaller scales inhomogeneities and aniso…