Purely kinetic coupled gravity

2011/06/14 by Giulia Gubitosi, Eric V. Linder · 3 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Relativity and Gravitational Theory #Solar and Space Plasma Dynamics #astro-ph.CO #gr-qc #hep-th

paper · pdf · doi:10.1016/j.physletb.2011.07.066

published as Phys. Lett. B 703, 113 (2011) · 7 pages, 3 figures

arxiv created 2011/06/14 · openalex publication_date 2011/08/02 · arxiv updated 2011/11/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

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 six 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.

Citations

• Kinetic k-essence and quintessence
• The galileon as a local modification of gravity
• k-Inflation
• Covariant Galileon

Cited by

• Cosmology with non-minimal coupled gravity: inflation and perturbation analysis
• Einstein static Universe in non-minimal kinetic coupled gravity
• Dark Energy after GW170817: dead ends and the road ahead