Rapid-turn inflation in supergravity is rare and tachyonic
Rapid-turn inflation in supergravity is rare and tachyonic
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DOI：
10.1088/1475-7516/2022/03/002
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发表时间：
2021-10
影响因子：
6.4
通讯作者：
Vikas Aragam;Roberta Chiovoloni;S. Paban;R. Rosati;I. Zavala
中科院分区：
文献类型：
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作者：
Vikas Aragam;Roberta Chiovoloni;S. Paban;R. Rosati;I. Zavala
多场暴胀中的强非测地线或快速转弯的轨道最近从理论和唯象的角度引起了人们的极大兴趣。在文献中，大多数具有大转弯率的模型都是用有效场论来表示的。在本文中，我们研究了超引力中的快速暴胀，作为理解弦理论的第一步。我们发现，大转弯率可以产生在广泛的一类模型，在高场空间曲率的成本。在这些模型中，虽然暴胀轨迹是稳定的，但一个海森本征值总是快子的，并且在哈勃单位中很大。因此，这些模型满足德西特沼泽地猜想沿着暴胀的轨迹。然而，高曲率强调了在现实弦理论模型中获得快速暴胀的困难。顺便说一下，我们重新审视了多场慢卷暴胀中的η-问题，并表明它不会出现，因为暴胀子，η i，都可以比哈勃尺度更重（绝对值）：|mi|/H>1，i。
Strongly non-geodesic, or rapidly turning trajectories in multifield inflation have attracted much interest recently from both theoretical and phenomenological perspectives. Most models with large turning rates in the literature are formulated as effective field theories. In this paper we investigate rapid-turn inflation in supergravity as a first step towards understanding them in string theory. We find that large turning rates can be generated in a wide class of models, at the cost of high field space curvature. In these models, while the inflationary trajectories are stable, one Hessian eigenvalue is always tachyonic and large, in Hubble units. Thus, these models satisfy the de Sitter swampland conjecture along the inflationary trajectory. However, the high curvatures underscore the difficulty of obtaining rapid-turn inflation in realistic string-theoretical models. In passing, we revisit the η-problem in multifield slow-roll inflation and show that it does not arise, inasmuch as the inflatons, ϕi , can all be heavier (in absolute value) that the Hubble scale: |mi |/H>1, ∀i.