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Large non-Gaussianity from two-component hybrid inflation
Christian T. Byrnes, Ki-Young Choi, Lisa M. H. Hall
We study the generation of non-Gaussianity in models of hybrid inflation with two inflaton fields, (2-brid inflation). We analyse the region in the parameter and the initial condit…
Conditions for large non-Gaussianity in two-field slow-roll inflation
Christian T. Byrnes, Ki-Young Choi, Lisa M. H. Hall
We study the level of primordial non-Gaussianity in slow-roll two-field inflation. Using an analytic formula for the nonlinear parameter f_nl in the case of a sum or product separa…
Multiple scalar particle decay and perturbation generation
Ki-Young Choi, Jinn-Ouk Gong
We study the evolution of the universe which contains a multiple number of non-relativistic scalar fields decaying into both radiation and pressureless matter. We present a powerfu…
Spectral Running and Non-Gaussianity from Slow-Roll Inflation in Generalised Two--Field Models
Ki-Young Choi, Lisa M. H. Hall, Carsten van de Bruck
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…