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The first year Wilkinson Microwave Anisotropy Probe data favor primordial adiabatic fluctuation with a running spectral index with nₒ>1 on a large scale and nₒ1 (hybrid inflation) or nₒ<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.
Kawasaki et al. (Mon,) studied this question.
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