Cosmological constraints on string scale and coupling arising from tachyonic instability

Details Cosmological constraints on string scale and coupling arising from tachyonic instability Cosmological constraints on string scale and coupling arising from tachyonic instability

2005-02-21

arxiv.org/abs/hep-th/0502185v2

JHEP 0508 (2005) 084

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, 2 figures, typo corrected, discussion and references added

Scientific paper

10.1088/1126-6708/2005/08/084

We demonstrate that string motivated inflation ending via tachyonic instability leaves a detectable imprint on the cosmic microwave background (CMB) radiation by virtue of the excitation of non-Gaussian gravitational fluctuations. The present WMAP bound on non-Gaussianity is shown to constrain the string scale by $M_S/M_P\leq 10^{-4}$ for string coupling $g_{s}<0.1$, hence improving the existing bounds. If tachyon fluctuations during inflation are not negligible, we find the stringent constraint $g_s\sim 10^{-9}$ for $M_{S}/M_{P}<10^{-3}$. This case may soon be ruled out by the forthcoming CMB non-Gaussinianity bounds.

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