Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-01-09
JCAP 0702:029,2007
Astronomy and Astrophysics
Astrophysics
26 pages, 10 figures, JHEP style, typos corrected, appendix and references added, published in JCAP
Scientific paper
10.1088/1475-7516/2007/02/029
Theories beyond the standard model such as string theory motivate low energy effective field theories with several scalar fields which are not only coupled through a potential but also through their kinetic terms. For such theories we derive the general formulae for the running of the spectral indices for the adiabatic, isocurvature and correlation spectra in the case of two field inflation. We also compute the expected non-Gaussianity in such models for specific forms of the potentials. We find that the coupling has little impact on the level of non-Gaussianity during inflation.
Choi Ki-Young
Hall Lisa M. H.
van de Bruck Carsten
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