Fab 5: noncanonical kinetic gravity, self tuning, and cosmic acceleration

Journal Article · Mon Oct 01 00:00:00 EDT 2012 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2012/10/060· OSTI ID:22279669

Appleby, Stephen A.; Linder, Eric V. ^[1]

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1. Institute for the Early Universe WCU, Ewha Womans University, Seoul (Korea, Republic of)

We investigate circumstances under which one can generalize Horndeski's most general scalar-tensor theory of gravity. Specifically we demonstrate that a nonlinear combination of purely kinetic gravity terms can give rise to an accelerating universe without the addition of extra propagating degrees of freedom on cosmological backgrounds, and exhibit self tuning to bring a large cosmological constant under control. This nonlinear approach leads to new properties that may be instructive for exploring the behaviors of gravity.

• OSTI ID: 22279669
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ACCELERATION
COSMOLOGICAL CONSTANT
COSMOLOGY
DEGREES OF FREEDOM
GRAVITATION
NONLINEAR PROBLEMS
SCALARS
TENSORS
UNIVERSE