2003/04/30 by Levon Pogosian, S.-H. Henry Tye, S. -H. Henry Tye +2 · 4 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.68.023506
published as Phys.Rev.D68:023506,2003; Erratum-ibid.D73:089904,2006 · 16 pages, 4 figures. A few errors in the computer code used to calculated CMB anistotropy from strings are fixed, resulting in a somewhat tighter bound on Gμand an enhanced B-mode polarization. Details of the corrected errors and their implications can be found in astro-ph/0604141
openalex publication_date 2003/07/03 · arxiv created 2006/04/06 · arxiv updated 2014/11/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Overall, brane inflation is compatible with the recent analysis of the WMAP data. Here we explore the constraints of WMAP and 2dFGRS data on the various brane inflationary scenarios. Brane inflation naturally ends with the production of cosmic strings, which may provide a way to distinguish these models observationally. We argue that currently available data cannot exclude a non-negligible contribution from cosmic strings definitively. We perform a partial statistical analysis of mixed models that include a sub-dominant contribution from cosmic strings. Although the data favor models without cosmic strings, we conclude that they cannot definitively rule out a cosmic-string-induced contribution of ∼ 10 % to the observed temperature, polarization and galaxy density fluctuations. These results imply that Gμ\lesssim 3.5× 10-7(λ/0.25)√(B/0.1), where λ is a dimensionless parameter related to the interstring distance, and B measures the importance of perturbations induced by cosmic strings. We argue that, conservatively, the data available currently still permit B\lesssim 0.1. Precision measurements sensitive to the B-mode polarization produced by vector density perturbation modes driven by the string network could provide evidence for these models. Accurate determinations of ns(k), the scalar fluctuation index, could also distinguish among various brane inflation models.