Cosmological constraints on string scale and coupling arising from tachyonic instability

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dc.creatorEnqvist, Kari
dc.creatorJokinen, Asko
dc.creatorMazumdar, Anupam
dc.creatorMultamaki, Tuomas
dc.creatorVaihkonen, Antti
dc.date2005-02-21
dc.date2005-03-18
dc.date.accessioned2026-07-07T04:18:05Z
dc.date.available2026-07-07T04:18:05Z
dc.descriptionWe 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.
dc.description12 pages, 2 figures, typo corrected, discussion and references added
dc.identifierhttps://arxiv.org/abs/hep-th/0502185
dc.identifierhttp://arxiv.org/abs/hep-th/0502185
dc.identifierJHEP 0508 (2005) 084
dc.identifierdoi:10.1088/1126-6708/2005/08/084
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/53035
dc.subjectHigh Energy Physics - Theory
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleCosmological constraints on string scale and coupling arising from tachyonic instability
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