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

Enqvist, Kari and Jokinen, Asko and Mazumdar, Anupam and Multamaki, Tuomas and Vaihkonen, Antti (2005) Cosmological constraints on string scale and coupling arising from tachyonic instability. Journal of High Energy Physics, 2005 (8). ISSN 1029-8479

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## Abstract

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}

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
12 pages, 2 figures, typo corrected, discussion and references added
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
Departments:
ID Code:
63466
Deposited By:
Deposited On:
19 Apr 2013 09:20
Refereed?:
Yes
Published?:
Published