Fibre inflation is one of the most popular models realized in the large volume scenarios (LVS) framework of the type IIB superstring compactifications using the Swiss-Cheese Calabi Yau (CY) threefolds. Being a large field inflationary model, it predicts a reasonably non-trivial tensor-to-scalar ratio along with fulfilling the standard requirements on the spectral tilt and the power spectrum amplitude. However, attempts of explicit global model building using some concrete CY orientifolds have shown that there is a strong bound on the inflaton range due to the restrictions coming from the Kaehler cone conditions of the CY threefolds used for realizing LVS. In order to overcome this challenge we propose an assisted version of the Fibre inflation in the so-called perturbative LVS where multiple K3-fibre moduli collectively assist in driving the inflation and consistently produce the cosmological observables in the light of the recent ACT bounds. We further argue that this "assisted-fibre prescription" may be extended to the Swiss-Cheese LVS in such a way that none of the inflaton moduli individually get closer to the boundary of the Kaehler cone. We also discuss the conditions on finding such CY threefolds suitable for assisted fibre inflation .
Mercredi
10 sep/25
16:30
-
17:30
(Europe/Zurich)
On Assisted Fibres with Swiss-Cheese
Where:
4/2-037 at CERN