Short distance non-perturbative effects of large distance modified gravity

TL;DR

This paper investigates nonperturbative effects in large distance modified gravity models, comparing exact solutions to approximations, and finds potential observational signatures such as reduced orbital precession and anomalous scaling.

Contribution

It provides a detailed comparison between nonperturbative Schwarzschild solutions and approximate models in large distance modified gravity, highlighting observable effects.

Findings

Nonperturbative solutions predict reduced orbital precession effects.

Effects could be observationally significant in Solar system tests.

Mild anomalous scaling of precession rate is identified.

Abstract

In a model of large distance modified gravity we compare the nonperturbative Schwarzschild solution of hep-th/0407049 to approximate solutions obtained previously. In the regions where there is a good qualitative agreement between the two, the nonperturbative solution yields effects that could have observational significance. These effects reduce, by a factor of a few, the predictions for the additional precession of the orbits in the Solar system, still rendering them in an observationally interesting range. The very same effects lead to a mild anomalous scaling of the additional scale-invariant precession rate found by Lue and Starkman.