# Covariant Generalized Holographic Dark Energy and Accelerating Universe

## TL;DR

This paper introduces a generalized holographic dark energy model linking IR cutoff to various universe parameters, enabling mapping to modified gravity and explaining cosmic acceleration phenomena.

## Contribution

It proposes a new covariant holographic dark energy framework that unifies inflation and dark energy through specific IR cutoff choices.

## Key findings

- Mapping to F(R) gravity and perfect fluid models.
- Realistic inflation and dark energy scenarios derived.
- Unified inflation-dark energy universe modeled.

## Abstract

We proposed the generalized holographic dark energy model where infrared cutoff is identified with the combination of the FRW universe parameters: the Hubble rate, particle and future horizons, cosmological constant, the universe life-time (if finite) and their derivatives. It is demonstrated that with the corresponding choice of the cutoff one can map such holographic dark energy to modified gravity or gravity with general fluid. Explicitly, F(R) gravity and general perfect fluid are worked out in detail and corresponding infrared cutoff is found. Using this correspondence, we get realistic inflation or viable dark energy or unified inflationary-dark energy universe in terms of covariant holographic dark energy.