Creating Statistically Anisotropic and Inhomogeneous Perturbations

Details Creating Statistically Anisotropic and Inhomogeneous Perturbations Creating Statistically Anisotropic and Inhomogeneous Perturbations

2007-05-08

arxiv.org/abs/0705.1167v1

JCAP 0709:014,2007

Astronomy and Astrophysics

Astrophysics

20 pages, 1 figure. Uses RevTeX4

Scientific paper

10.1088/1475-7516/2007/09/014

In almost all structure formation models, primordial perturbations are created within a homogeneous and isotropic universe, like the one we observe. Because their ensemble averages inherit the symmetries of the spacetime in which they are seeded, cosmological perturbations then happen to be statistically isotropic and homogeneous. Certain anomalies in the cosmic microwave background on the other hand suggest that perturbations do not satisfy these statistical properties, thereby challenging perhaps our understanding of structure formation. In this article we relax this tension. We show that if the universe contains an appropriate triad of scalar fields with spatially constant but non-zero gradients, it is possible to generate statistically anisotropic and inhomogeneous primordial perturbations, even though the energy momentum tensor of the triad itself is invariant under translations and rotations.

Affiliated with

Also associated with

No associations

Rating

Creating Statistically Anisotropic and Inhomogeneous Perturbations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Creating Statistically Anisotropic and Inhomogeneous Perturbations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Creating Statistically Anisotropic and Inhomogeneous Perturbations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-645176