Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-04-22
Phys.Rev. D68 (2003) 023506; Erratum-ibid. D73 (2006) 089904
Physics
High Energy Physics
High Energy Physics - Theory
16 pages, 4 figures. A few errors in the computer code used to calculated CMB anistotropy from strings are fixed, resulting in
Scientific paper
10.1103/PhysRevD.68.023506
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 $\sim 10 %$ to the observed temperature, polarization and galaxy density fluctuations. These results imply that $G\mu \lesssim 3.5\times 10^{-7}(\lambda/0.25)\sqrt{B/0.1}$, where $\lambda$ 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 $n_s(k)$, the scalar fluctuation index, could also distinguish among various brane inflation models.
Henry Tye S.-H.
Pogosian Levon
Wasserman Ira
Wyman Mark
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