Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Cosmological constraints on string scale and coupling arising from tachyonic instability
AU - Enqvist, Kari
AU - Jokinen, Asko
AU - Mazumdar, Anupam
AU - Multamaki, Tuomas
AU - Vaihkonen, Antti
N1 - 12 pages, 2 figures, typo corrected, discussion and references added
PY - 2005/8/25
Y1 - 2005/8/25
N2 - 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}
AB - 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}
KW - Tachyon Condensation
KW - cosmology of theories beyond the SM
KW - Bosonic Strings
U2 - 10.1088/1126-6708/2005/08/084
DO - 10.1088/1126-6708/2005/08/084
M3 - Journal article
VL - 2005
JO - Journal of High Energy Physics
JF - Journal of High Energy Physics
SN - 1029-8479
IS - 8
M1 - 84
ER -