English

Nonlocal Models of Cosmic Acceleration

Cosmology and Nongalactic Astrophysics 2015-06-18 v1 General Relativity and Quantum Cosmology High Energy Physics - Theory

Abstract

I review a class of nonlocally modified gravity models which were proposed to explain the current phase of cosmic acceleration without dark energy. Among the topics considered are deriving causal and conserved field equations, adjusting the model to make it support a given expansion history, why these models do not require an elaborate screening mechanism to evade solar system tests, degrees of freedom and kinetic stability, and the negative verdict of structure formation. Although these simple models are not consistent with data on the growth of cosmic structures many of their features are likely to carry over to more complicated models which are in better agreement with the data.

Keywords

Cite

@article{arxiv.1401.0254,
  title  = {Nonlocal Models of Cosmic Acceleration},
  author = {R. P. Woodard},
  journal= {arXiv preprint arXiv:1401.0254},
  year   = {2015}
}

Comments

20 pages, one figure, review article written at the request of Foundations of Physics

R2 v1 2026-06-22T02:37:49.556Z