Tensorinduced B modes with no temperature fluctuations
Abstract
The recent indications for a tensortoscalar ratio r≃0.2 from BICEP2 measurements of the cosmic microwave background (CMB) Bmode polarization present some tension with upper limits r≲0.1 from measurements of CMB temperature fluctuations. Here we point out that tensor perturbations can induce B modes in the CMB polarization without inducing any temperature fluctuations nor Emode polarization whatsoever, but only at the expense of violating the Copernican principle. We present this mathematical possibility as a new ingredient for the modelbuilder's toolkit in case the tension between B modes and temperature fluctuations cannot be resolved with more conventional ideas.
 Publication:

Physical Review D
 Pub Date:
 May 2014
 DOI:
 10.1103/PhysRevD.89.107302
 arXiv:
 arXiv:1404.3730
 Bibcode:
 2014PhRvD..89j7302K
 Keywords:

 98.80.k;
 98.80.Cq;
 98.80.Jk;
 Cosmology;
 Particletheory and fieldtheory models of the early Universe;
 Mathematical and relativistic aspects of cosmology;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 High Energy Physics  Phenomenology
 EPrint:
 4 pages, published version in PRD