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- W2023192030 abstract "We consider the running of the spectral index as a probe of both inflation itself, and of the overall evolution of the very early universe. Surveying a collection of simple single field inflationary models, we confirm that the magnitude of the running is relatively consistent, unlike the tensor amplitude, which varies by orders of magnitude. Given this target, we confirm that the running is potentially detectable by future large scale structure or 21 cm observations, but that only the most futuristic measurements can distinguish between these models on the basis of their running. For any specified inflationary scenario, the combination of the running index and unknown post-inflationary expansion history induces a theoretical uncertainty in the predicted value of the spectral index. This effect can easily dominate the statistical uncertainty with which Planck and its successors are expected to measure the spectral index. More positively, upcoming cosmological experiments thus provide an intriguing probe of physics between TeV and GUT scales by constraining the reheating history associated with any specified inflationary model, opening a window into the ``primordial dark age'' that follows the end of inflation." @default.
- W2023192030 created "2016-06-24" @default.
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- W2023192030 creator A5040946565 @default.
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- W2023192030 date "2011-02-16" @default.
- W2023192030 modified "2023-10-01" @default.
- W2023192030 title "Inflation and the scale dependent spectral index: prospects and strategies" @default.
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- W2023192030 doi "https://doi.org/10.1088/1475-7516/2011/02/021" @default.
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