Trans-Planckian censorship and other swampland bothers addressed in warm inflation
Arjun Berera, Jaime R. Calder\'on

TL;DR
This paper explores how the Trans-Planckian censorship conjecture affects warm inflation models, showing that multi-stage inflation can relax censorship constraints and allow for larger tensor-to-scalar ratios.
Contribution
It introduces a two-stage inflationary model within warm inflation that alleviates TCC constraints, expanding the viable parameter space for inflationary scenarios.
Findings
Single-stage warm inflation faces similar TCC constraints as cold inflation.
Two-stage inflation with an intermediate radiation era relaxes TCC bounds.
Tensor-to-scalar ratio can be as high as 10^{-5} under weaker TCC assumptions.
Abstract
The implications of the recently proposed Trans-Planckian censorship conjecture (TCC) are analyzed in the context of warm inflation. It is found that for a single-stage accelerated expansion the constraints imposed by the censorship are roughly the same as for cold inflation. Next, we study how a two-stage inflationary expansion with an intermediate radiation-dominated era can alleviate the bounds imposed by the censorship. For a demonstrative toy model we found , but can be for a weaker form of TCC for the later stages of expansion, while still satisfying the other swampland conditions.
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