Matter/microwave Correlations in an Open Universe Typeset Using Revt E X

Geocentrism Re-examined Typeset Using Revt E X 1

Observations show that the universe is nearly isotropic on very large scales. It is much more difficult to show that the universe is radially homogeneous— that is, independent of distance from us—or equivalently, that the universe is isotropic about distant points. This is usually taken as an axiom, since otherwise we would occupy a special position. Here we consider several empirical arguments...

The Cdm Isocurvature Perturbation in the Curvaton Scenario Typeset Using Revt E X 1

We discuss the residual isocurvature perturbations, fully-correlated with the curvature perturbation, that are automatic in the curvaton scenario if curvaton decay is sufficiently late. We contrast these residual isocurvature perturbations with the generally un-correlated ‘intrinsic’ isocurvature perturbation generated by an additional field such as the axion. We present a general formula for t...

Mixed dark matter with neutrino chemical potentials.

Mixed dark matter models with one low-mass (e.g. 2.4eV) neutrino avor are shown to be in good agreement with observations if the neutrinos have nonzero chemical potentials. This agreement holds (except for the problem with a low-age Universe) even for high values of the Hubble-parameter. Massless neutrinos with non-zero chemical potentials may reconcile cold dark matter with observations. Some ...

Nested Braneworlds and Strong Brane Gravity Typeset Using Revt E X

We find the gravitational field of a ‘nested’ domain wall living entirely within a brane-universe, or, a localised vortex within a wall. For a vortex living on a critical Randall-Sundrum brane universe, we show that the induced gravitational field on the brane is identical to that of an (n−1)-dimensional vacuum domain wall. We also describe how to set-up a nested Randall-Sundrum scenario using ...

Matter-microwave correlations in an open universe.