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Gravitational waves and large field inflation

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arxiv 1612.00020 v1 pith:7PINGIVW submitted 2016-11-30 astro-ph.CO gr-qchep-phhep-th

Gravitational waves and large field inflation

classification astro-ph.CO gr-qchep-phhep-th
keywords inflationlargefieldanswerdefinitionsdifferentfindingmodes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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According to the famous Lyth bound, one can confirm large field inflation by finding tensor modes with sufficiently large tensor-to-scalar ratio $r$. Here we will try to answer two related questions: Is it possible to rule out all large field inflationary models by not finding tensor modes with $r$ above some critical value, and what can we say about the scale of inflation by measuring $r$? However, in order to answer these questions one should distinguish between two different definitions of the large field inflation and three different definitions of the scale of inflation. We will examine these issues using the theory of cosmological $\alpha$-attractors as a convenient testing ground.

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Cited by 2 Pith papers

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    In asymptotically flat spacetimes, a localized inflaton fluctuation requires a proper size of at least ~2.5 times the inflationary scale to successfully seed inflation, generalizing the Goldwirth-Piran result.

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    astro-ph.IM 2019-07 unverdicted novelty 3.0

    Presents the science case, reference design, and project plan for the CMB-S4 ground-based CMB experiment.