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Title: Observational viability and stability of nonlocal cosmology

We show that the nonlocal gravity models, proposed to explain current cosmic acceleration without dark energy, pass two essential tests: first, they can be defined so as not to alter the, observationally correct, general relativity predictions for gravitationally bound systems. Second, they are stable, ghost-free, with no additional excitations beyond those of general relativity. In this they differ from their, ghostful, localized versions. The systems' initial value constraints are the same as in general relativity, and our nonlocal modifications never convert the original gravitons into ghosts.
Authors:
 [1] ;  [2]
  1. California Institute of Technology, Pasadena, CA, 91125 (United States)
  2. Department of Physics, University of Florida, Gainesville, FL, 32611 (United States)
Publication Date:
OSTI Identifier:
22369917
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; COSMOLOGY; GENERAL RELATIVITY THEORY; GRAVITATION; GRAVITONS; LIMITING VALUES; NONLUMINOUS MATTER