# Solution of the cosmological constant problem within holographic cosmology

## TL;DR

This paper explores how holographic cosmology models, especially McFadden and Skenderis's, naturally explain the small observed value of the cosmological constant through dual RG flow, linking gravity to quantum field theory.

## Contribution

It demonstrates that the cosmological constant problem can be understood as a property of quantum field theories within holographic cosmology, providing new insights into its resolution.

## Key findings

- The cosmological constant flows from large to small values in holographic models.
- The problem maps to a quantum field theory property, simplifying its understanding.
- Several gravity dual examples illustrate the mechanism.

## Abstract

Within the holographic cosmology paradigm, specifically the model of McFadden and Skenderis, but more generally than that, the cosmological constant is found to naturally flow from a large value, to a small value, which can even be as low as the needed $\sim 10^{-120}$ times the original, along with the dual RG flow. Within this context then, the cosmological constant problem is mapped to a simple quantum field theory property, even though the exact mechanism for it in gravity is still obscure. I consider several examples of gravity duals to explain the mechanism.