Fibre inflation and α-attractors
2018; Springer Nature; Volume: 2018; Issue: 2 Linguagem: Inglês
10.1007/jhep02(2018)117
ISSN1127-2236
AutoresРената Каллош, Andrei Linde, Diederik Roest, Alexander Westphal, Yusuke Yamada,
Tópico(s)Galaxies: Formation, Evolution, Phenomena
ResumoFibre inflation is a specific string theory construction based on the Large Volume Scenario that produces an inflationary plateau. We outline its relation to α-attractor models for inflation, with the cosmological sector originating from certain string theory corrections leading to α = 2 and α = 1/2. Above a certain field range, the steepening effect of higher-order corrections leads first to the breakdown of single-field slow-roll and after that to the onset of 2-field dynamics: the overall volume of the extra dimensions starts to participate in the effective dynamics. Finally, we propose effective supergravity models of fibre inflation based on an $$ \overline{D3} $$ uplift term with a nilpotent superfield. Specific moduli dependent $$ \overline{D3} $$ induced geometries lead to cosmological fibre models but have in addition a de Sitter minimum exit. These supergravity models motivated by fibre inflation are relatively simple, stabilize the axions and disentangle the Hubble parameter from supersymmetry breaking.
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