Are all perturbations created equal? An analysis of the WMAP 5- and 7-year data without inflationary prejudice

Details Are all perturbations created equal? An analysis of the WMAP 5- and 7-year data without inflationary prejudice Are all perturbations created equal? An analysis of the WMAP 5- and 7-year data without inflationary prejudice

2010-08-26

arxiv.org/abs/1008.4471v1

Phys.Rev.D83:067301,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

12 pages, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.83.067301

We submit recent claims of a semi-significant detection of primordial tensor perturbations in the WMAP data to a closer scrutiny. Our conclusion is in brief that no such mode is present at a detectable level once the analysis is done more carefully. These claims have their root in a brief debate in the late 1990s about the standard calculation of the scalar and tensor spectra in standard inflationary theory, where Grishchuk and collaborators claimed that their amplitudes should be roughly equal. We give a brief summary of the debate and our own reasons for why the standard calculation is correct.

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