# The role of an invariant IR cutoff in late time cosmological dynamics

## TL;DR

This paper investigates how an invariant infrared cutoff, derived from minimal measurable uncertainty, influences late-time cosmological dynamics, potentially explaining cosmic acceleration and phantom phases, constrained by PLANCK2018 data.

## Contribution

It introduces an IR cutoff from extended uncertainty relations into cosmological models, linking quantum gravity concepts with late-time universe acceleration.

## Key findings

- IR cutoff acts as an effective fluid driving cosmic acceleration
- Model can explain transition to phantom expansion
- Constraints on uncertainty relation parameters from observational data

## Abstract

We study the role of an invariant infra-red cutoff in the late time cosmological dynamics. This low energy cutoff originates from the existence of a minimal measurable uncertainty as a result of the curvature of background manifold, and can be encoded in an extended uncertainty relation. Inspired by black hole entropy-area relation, we extend the analysis to the thermodynamics of apparent horizon of the universe. By treating both the Newtonian and general relativistic cosmologies, we show that the contribution of infra-red cutoff in the equations of dynamics can be interpreted as an effective fluid which is capable of explaining late time cosmic speed up and even transition to a phantom phase of expansion. We use the latest observational data from PLANCK2018 to constrain the parameter of an extended uncertainty relation.