Reconstructing the Distortion Function for Nonlocal Cosmology
General Relativity and Quantum Cosmology
2009-08-24 v2 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
We consider the cosmology of modified gravity models in which Newton's constant is distorted by a function of the inverse d'Alembertian acting on the Ricci scalar. We derive a technique for choosing the distortion function so as to fit an arbitrary expansion history. This technique is applied numerically to the case of LambdaCDM cosmology, and the result agrees well with a simple hyperbolic tangent.
Cite
@article{arxiv.0904.0961,
title = {Reconstructing the Distortion Function for Nonlocal Cosmology},
author = {C. Deffayet and R. P. Woodard},
journal= {arXiv preprint arXiv:0904.0961},
year = {2009}
}
Comments
17 pages, 1 figure, dedicated to Stanley Deser on the occasion of his 78th birthday, revised version for publication in JCAP