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Purely kinetic coupled gravity

Title
Purely kinetic coupled gravity
Authors
Gubitosi G.Linder E.V.
Ewha Authors
Eric V. Linder
Issue Date
2011
Journal Title
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
ISSN
0370-2693JCR Link
Citation
vol. 703, no. 2, pp. 113 - 118
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Cosmic acceleration can be achieved not only with a sufficiently flat scalar field potential but through kinetic terms coupled to gravity. These derivative couplings impose a shift symmetry on the scalar field, aiding naturalness. We write the most general purely kinetic action not exceeding mass dimension 6 and obeying second order field equations. The result reduces to a simple form involving a coupling of the Einstein tensor with the kinetic term and can be interpreted as adding a new term to Galileon gravity in curved spacetime. We examine the cosmological implications of the effective dark energy and classify the dynamical attractor solutions, finding a quasistable loitering phase mimicking late time acceleration by a cosmological constant. © 2011 Elsevier B.V.
DOI
10.1016/j.physletb.2011.07.066
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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