Instabilities in tensorial nonlocal gravity
arXiv:1610.01799 · doi:10.1103/PhysRevD.95.043539
Abstract
We discuss the cosmological implications of nonlocal modifications of general relativity containing tensorial structures. Assuming the presence of standard radiation- and matter-dominated eras, we show that, except in very particular cases, the nonlocal terms contribute a rapidly growing energy density. These models therefore generically do not have a stable cosmological evolution.
10 pages, 2 figures. v2: version published in PRD