# On Nonlocal Modified Gravity and its Cosmological Solutions

## TL;DR

This paper reviews nonlocal modified gravity models, focusing on their cosmological solutions and introducing new results, as an extension of General Relativity to address its limitations.

## Contribution

It provides a concise review of nonlocal gravity models with cosmological solutions and presents new findings in the field.

## Key findings

- Analysis of nonlocal gravity models with analytic functions of the d'Alembert-Beltrami operator
- Presentation of new cosmological solutions within nonlocal gravity frameworks
- Insights into how nonlocality can address issues in modern gravity theories

## Abstract

During hundred years of General Relativity (GR), many significant gravitational phenomena have been predicted and discovered. General Relativity is still the best theory of gravity. Nevertheless, some (quantum) theoretical and (astrophysical and cosmological) phenomenological difficulties of modern gravity have been motivation to search more general theory of gravity than GR. As a result, many modifications of GR have been considered. One of promising recent investigations is Nonlocal Modified Gravity. In this article we present a brief review of some nonlocal gravity models with their cosmological solutions, in which nonlocality is expressed by an analytic function of the d'Alembert-Beltrami operator $\Box$. Some new results are also presented.