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Perturbation amplitude in isocurvature inflation scenarios

Research output: Contribution to journalJournal article


Article number123507
Journal publication date12/05/2000
JournalPhysical Review D
Number of pages7
Original languageEnglish


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.

Bibliographic note

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