Swampland conjectures and single field inflation in non-standard cosmological scenarios

TL;DR

This paper demonstrates that many single field inflationary models, which face challenges under swampland conjectures in standard cosmology, can be compatible within non-standard cosmological frameworks using exact solutions.

Contribution

It shows how non-standard cosmological scenarios allow single field inflation models to satisfy swampland conjectures without fine tuning, using an exact solution approach.

Findings

Single field inflation models can bypass swampland constraints in non-standard cosmologies.

Exact solutions reveal compatibility between string theory motivations and inflation models.

Non-standard scenarios expand viable inflationary model space.

Abstract

Swampland conjectures have attracted quite some interest in the cosmological community. They have been shown to have wide ranging implications , like constraints on inflationary models, primordial black holes, dark energy to name a few. Particularly, their implications on single field inflationary models in general relativity based cosmology has gathered huge attention. Swampland conjectures in their usual form have been shown to be incompatible with these kind of single field models, or have been shown to induce severe fine tuning in these inflationary models for them to be consistent with the conjectures. In this work, we show that a large class of single field inflationary models can in fact bypass the problems faced by inflationary paradigms in GR Based cosmology. We use the exact solution approach to inflation for the same purpose and show how string theoretic motivations of the swampland conjectures can be in perfect symphony with various single field inflationary models in non-standard cosmological scenarios.