Constant-roll inflation with tachyon field in the holographic braneworld

We study inflation driven by the tachyon field in the holographic braneworld by assuming the second slow-roll parameter η is constant. The parameter η can be either defined by the tachyon scalar field and the Hubble parameter or by the Hubble parameter only. By assuming a constant η , we derive and...

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Bibliographic Details
Published in:Classical and quantum gravity 2024-08, Vol.41 (16), p.165013
Main Authors: Stojanovic, Marko, Bilić, Neven, Dimitrijevic, Dragoljub D, Djordjevic, Goran S, Milosevic, Milan
Format: Article
Language:English
Subjects:
constant-roll inflation
RSII cosmology
tachyon inflation
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Summary:We study inflation driven by the tachyon field in the holographic braneworld by assuming the second slow-roll parameter η is constant. The parameter η can be either defined by the tachyon scalar field and the Hubble parameter or by the Hubble parameter only. By assuming a constant η , we derive and numerically solve a differential equation for the Hubble expansion rate. We calculate numerically the scalar spectral index and the tensor-to-scalar ratio. We confront the results with the observational data and find some constraints on the free model parameters. The swampland conjectures are discussed in the context of the constant-roll inflation, with some accent on the holographic model.
ISSN:0264-9381
1361-6382
DOI:10.1088/1361-6382/ad6058