Inflation with a running spectral index in supergravity

The first year Wilkinson Microwave Anisotropy Probe data favors primordial adiabatic fluctuation with a running spectral index with \ns >1 on a large scale and \ns <1 on a smaller scale. The model building of inflation that predicts perturbations with such a spectrum is a challenge, because most models predict fluctuations with either \ns >1 (hybrid inflation) or \ns <1 (new, chaotic, or topological inflation). We give a sensible particle physics model in supergravity that accommodates the desired running of the spectral index using double inflation.

11.27.+d
04.65.+e
98.80.Cq
inflation: hybrid
supergravity
cosmic background radiation
fluctuation: adiabatic

References(26)

Figures(0)

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