Physics – High Energy Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1040..116i&link_type=abstract
KEK COSMOPHYSICS GROUP INAUGURAL CONFERENCE ``ACCELERATORS IN THE UNIVERSE'': Interplay between High Energy Physics and Cosmophy
Physics
High Energy Physics
Particle-Theory And Field-Theory Models Of The Early Universe, Background Radiations, Quantum Cosmology, Astronomical Observations, Quantum Fluctuations, Quantum Noise, And Quantum Jumps
Scientific paper
We study non-Gaussianity, the spectral index of primordial scalar fluctuations and tensor modes in models where fluctuations from the inflaton and the curvaton can both contribute to the present cosmic density fluctuations. Even though simple single-field inflation models generate only tiny non-Gaussianity, if we consider such a mixed scenario, large non-Gaussianity can be produced. Furthermore, we study the inflationary parameters such as the spectral index and the tensor-to-scalar ratio in this kind of models and discuss in what cases models predict the spectral index and tensor modes allowed by the current data while generating large non-Gaussianity, which may have many implications for model-buildings of the inflationary universe.
Ichikawa Kazuhide
Suyama Teruaki
Takahashi Tomo
Yamaguchi Masahide
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