# Reheating Constraints on Inflaton, Dark Matter: Swampland Conjecture

## TL;DR

This paper explores how the swampland conjecture impacts inflationary models, reheating, and dark matter, revealing tensions with current theories and constraining key parameters through observational data.

## Contribution

It analyzes the effects of the swampland conjecture on inflation, reheating, and dark matter, providing new constraints and highlighting tensions with existing models.

## Key findings

- Successful inflationary scenarios are in tension with the conjecture.
- Constraints on reheating temperature and dark matter cross-section are derived.
- Connection established between the conjecture and scalar spectral index $n_s$.

## Abstract

In this paper, we studied the phenomenological consequences of recently proposed swampland conjecture on the inflationary models though constraints on reheating. If dark matter is assumed to be produced during reheating, the conjecture will provide further constraints on the dark matter parameter space through its current relic abundance. As has been pointed out already and also analyzed in our present paper any successful inflationary scenario is in clear tension with the aforementioned conjecture in its current form. However considering the swampland parameters to be free and constrained by the inflationary observables, we studied in detail its consequence on the reheating and dark matter phenomenology. We point out the connection between swampland conjecture and the scalar spectral index $n_s$ by PLANCK within current $2 \sigma$ range, and associated constraints imposed on the reheating temperature and the dark matter annihilation cross-section.