Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2012/08/026
Keywords
dark energy theory; modified gravity
Funding
- World Class University through the National Research Foundation, Ministry of Education, Science and Technology of Korea [R32-2009-000-10130-0]
- Office of Science, Office of High Energy Physics, of the U.S. Department of Energy [DE-AC02-05CH11231]
- National Research Foundation of Korea [R32-2012-000-10130-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Galileon gravity is a robust theoretical alternative to general relativity with a cosmological constant for explaining cosmic acceleration, with interesting properties such as having second order field equations and a shift symmetry. While either its predictions for the cosmic expansion or growth histories can approach standard Lambda CDM, we demonstrate the incompatibility of both doing so simultaneously. Already current observational constraints can severely disfavor an entire class of Galileon gravity models that do not couple directly to matter, ruling them out as an alternative to Lambda CDM.
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