The direction of gravity

7th International Conference on Gravitation and Cosmology

Linder, E.V.^1,2

Berkeley Lab, University of California, Berkeley, CA 94720, United States^1

Institute for the Early Universe WCU, Ewha Womans University, Seoul, Korea, Republic of^2

关键词: Cosmological measurements;    Cosmological scale;    Dark energy;    Early universe;    General Relativity;    Gravitational theory;    Negative pressures;    Shift symmetry;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/484/1/012006/pdf
DOI  :  10.1088/1742-6596/484/1/012006

来源: IOP

【 摘 要 】

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 have examined methods to test the properties of gravity through cosmological measurements. We have then considered specific possibilities for a sound gravitational theory based on the Galilean 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.