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• W3100464958 abstract "We investigate multi-field inflationary scenarios with fields that drop out of the model in a staggered fashion. This feature is natural in certain multi-field inflationary setups within string theory; for instance, it can manifest itself when fields are related to tachyons that condense, or inter-brane distances that become meaningless when branes annihilate. Considering a separable potential, and promoting the number of fields to a smooth time dependent function, we derive the formalism to deal with these models at the background and perturbed level, providing general expressions for the scalar spectral index and the running. We recover known results of e.g. a dynamically relaxing cosmological constant in the appropriate limits. We further show that isocurvature perturbations are suppressed during inflation, and so perturbations are adiabatic and nearly Gaussian. The resulting setup might be interpreted as a novel type of warm inflation, readily implemented within string theory and without many of the shortcomings associated with warm inflation." @default.
• W3100464958 created "2020-11-23" @default.
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• W3100464958 date "2008-10-17" @default.
• W3100464958 modified "2023-09-27" @default.
• W3100464958 title "Staggered multi-field inflation" @default.
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• W3100464958 doi "https://doi.org/10.1088/1475-7516/2008/10/032" @default.
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