Brane inflation: swampland criteria, TCC, and reheating predictions

TL;DR

This paper explores brane-world inflation models, analyzing their compatibility with observational data, swampland criteria, and the trans-Planckian censorship conjecture, with implications for reheating and brane tension constraints.

Contribution

It assesses various inflaton potentials in a brane-world context, demonstrating models that satisfy observational, swampland, and TCC constraints, and explores reheating bounds.

Findings

Some potentials fit observational data with sub-Planckian fields.

Certain models meet swampland criteria and TCC constraints.

Reheating temperature bounds restrict model parameters.

Abstract

We consider inflation in a five -dimensional space time with the inflaton field confined to live on a brane world. In this scenario, we study different types of potentials for the inflaton, discuss their observational consequences, and compare with data. We find that some class of potentials are in good agreement with observation and that the value of the inflaton field can be sub-Planckian. Moreover, we investigate the swampland criteria in this scenario and determine the consistency of the model with the conjectures. Doing so, we could determine models that simultaneously satisfy both observational data and swampland criteria. More constraints are applied by studying the reheating phase where the acceptable range for the reheating temperature imposes some bounds on the models. As the last step, the result of trans-Planckian censorship conjecture for the model is considered where it is shown the constraint of TCC will be very strong and it could be used to applied limit on the brane tension.