A new quasidilaton theory of massive gravity

Journal Article · Mon Dec 01 00:00:00 EST 2014 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2014/12/011· OSTI ID:22382093

Mukohyama, Shinji ^[1]

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1. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)

We present a new quasidilaton theory of Poincare invariant massive gravity, based on the recently proposed framework of matter coupling that makes it possible for the kinetic energy of the quasidilaton scalar to couple to both physical and fiducial metrics simultaneously. We find a scaling-type exact solution that expresses a self-accelerating de Sitter universe, and then analyze linear perturbations around it. It is shown that in a range of parameters all physical degrees of freedom have non-vanishing quadratic kinetic terms and are stable in the subhorizon limit, while the effective Newton's constant for the background is kept positive.

• OSTI ID: 22382093
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2014, Issue 12; 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
COUPLING
DE SITTER GROUP
DE SITTER SPACE
DEGREES OF FREEDOM
EXACT SOLUTIONS
GRAVITATION
KINETIC ENERGY
MATTER
METRICS
PERTURBATION THEORY
SCALARS
UNIVERSE