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CMB targets after the latest Planck data release

2019; American Physical Society; Volume: 100; Issue: 12 Linguagem: Inglês

10.1103/physrevd.100.123523

2470-0037

Рената Каллош, Andrei Linde,

Pulsars and Gravitational Waves Research

We show that a combination of the simplest $\ensuremath{\alpha}$ attractors and KKLT inflation models related to Dp-brane inflation covers most of the area in the (${n}_{s}$, $r$) space favored by Planck 2018. For $\ensuremath{\alpha}$-attractor models, there are discrete targets $3\ensuremath{\alpha}=1,2,\dots{},7$, predicting seven different values of $r=12\ensuremath{\alpha}/{N}^{2}$ in the range ${10}^{\ensuremath{-}2}\ensuremath{\gtrsim}r\ensuremath{\gtrsim}{10}^{\ensuremath{-}3}$. In the small $r$ limit, $\ensuremath{\alpha}$-attractors and Dp-brane inflation models describe vertical $\ensuremath{\beta}$ stripes in the (${n}_{s}$, $r$) space, with ${n}_{s}=1\ensuremath{-}\ensuremath{\beta}/N$, $\ensuremath{\beta}=2,\frac{5}{3},\frac{8}{5},\frac{3}{2},\frac{4}{3}$. A phenomenological description of these models and their generalizations can be achieved in the context of pole inflation. Most of the $1\ensuremath{\sigma}$ area in the (${n}_{s}$, $r$) space favored by Planck 2018 can be covered models with $\ensuremath{\beta}=2$ and $\ensuremath{\beta}=5/3$. Future precision data on ${n}_{s}$ may help to discriminate between these models even if the precision of the measurement of $r$ is insufficient for the discovery of gravitational waves produced during inflation.