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B-mode targets
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DOI：10.1016/j.physletb.2019.134970.png)
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Abstract
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The CMB-S4 Science Book [1], Simons Observatory report [2], Astro2020 Science White Paper on gravitational waves [3], and PICO report [4] contain an extensive discussion of many ongoing and planned efforts in the search for gravitational waves produced by inflation. Here we give a short executive summary of the results obtained in our papers [5-7], which specify the simplest available inflationary models providing physically motivated targets for these searches. Our conclusions are specific for the 10(-3) less than or similar to r less than or similar to 10(-2) range, where we present the B-mode benchmarks of the U-duality symmetric class of alpha-attractors, and for r less than or similar to 10(-3), where we present B-mode targets, for which the future precision measurements of n(s) will be decisive. We show that a combination of the simplest alpha-attractors and KKLTI models of D-brane inflation covers most of the area favored by Planck 2018. (C) 2019 Published by Elsevier B.V.
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