Structure formation in a nonlocally modified gravity model

TL;DR

This paper investigates a nonlocal gravity model that explains cosmic acceleration and predicts a distinct structure growth pattern, which can be tested by upcoming galaxy surveys, offering a potential alternative to dark energy.

Contribution

It derives and analyzes the structure formation equations in a nonlocally modified gravity model, highlighting observable differences from standard cosmology.

Findings

Predicts 10-30% difference in structure growth compared to GR with dark energy

Provides equations governing cosmic structure evolution in the model

Suggests the model can be tested by future galaxy surveys

Abstract

We study a nonlocally modified gravity model proposed by Deser and Woodard which gives an explanation for current cosmic acceleration. By deriving and solving the equations governing the evolution of the structure in the Universe, we show that this model predicts a pattern of growth that differs from standard general relativity (+dark energy) at the 10-30% level. These differences will be easily probed by the next generation of galaxy surveys, so the model should be tested shortly.