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Perturbation amplitude in isocurvature inflation scenarios

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Article number123507
<mark>Journal publication date</mark>12/05/2000
<mark>Journal</mark>Physical Review D
Issue number12
Number of pages7
<mark>Original language</mark>English


We make a detailed calculation of the amplitude of isocurvature perturbations arising from inflationary models in which the cold dark matter is represented by a scalar field which acquires perturbations during inflation. We use this to compute the normalization to large-angle microwave background anisotropies. Unlike the case of adiabatic perturbations, the normalization to COBE fixes the spectral index of the perturbations; if adiabatic perturbations are negligible then $n_{iso} \simeq 0.4$. Such blue spectra are also favoured by other observational data. Although the pure isocurvature models are unlikely to adequately fit the entire observational data set, these results also have implications for models with mixed adiabatic and isocurvature perturbations.

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© 2000 The American Physical Society 7 pages RevTeX file with one figure