The Direction of Gravity
Cosmology and Nongalactic Astrophysics
2014-03-12 v1 General Relativity and Quantum Cosmology
Abstract
Gravity directs the paths of light rays and the growth of structure. Moreover, gravity on cosmological scales does not simply point down: it accelerates the universal expansion by pulling outward, either due to a highly negative pressure dark energy or an extension of general relativity. We examine methods to test the properties of gravity through cosmological measurements. We then consider specific possibilities for a sound gravitational theory based on the Galileon shift symmetry. The evolution of the laws of gravity from the early universe to the present acceleration to the future fate -- the paths of gravity -- carries rich information on this fundamental force of physics and on the mystery of dark energy.
Cite
@article{arxiv.1201.5127,
title = {The Direction of Gravity},
author = {Eric V. Linder},
journal= {arXiv preprint arXiv:1201.5127},
year = {2014}
}
Comments
8 pages, 2 new figures