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Cosmological constraints on string scale and coupling arising from tachyonic instability

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Article number84
<mark>Journal publication date</mark>25/08/2005
<mark>Journal</mark>Journal of High Energy Physics
Issue number8
<mark>Original language</mark>English


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} M_{P}

Bibliographic note

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