Cascading gravity and degravitation

By Claudia de Rham, S. Hofmann, J. Khoury, A. Tolley. 2007

158 citations recorded by the source corpus.

We construct a cascading brane model of gravity in which the behavior of the gravitational force law interpolates from (n+4)-dimensional to (n+3)-dimensional all the way down to 4-dimensional from longer to shorter length scales. We show that, at the linearized level, this model exhibits the features necessary for degravitation of the cosmological constant. The model is shown to be ghost free with the addition of suitable brane kinetic operators, and we demonstrate this using a number of independent procedures. Consequently this is a consistent infrared (IR) modification of gravity, providing a promising framework for a dynamical, degravitating solution of the cosmological constant problem.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/7ade0b16b58fc3284f347c24e889ecc7ac80ad39

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Citations in the corpus

Theoretical Aspects of Massive Gravity (2011, background): “DGP corresponds to α = 1/2, and so it just barely fails to degravitate, but by extending the DGP idea to higher co-dimension [188, 189] or to multi-brane cascading DGP models [190, 191, 192], α < 1/2 can be achieved and degravitation made to work [193].”
Cosmological tests of modified gravity (2015, background): “There have been many attempts to extend the 5D DGP to 6D [59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71].”
Beyond the Cosmological Standard Model (2014, unknown): “In terms of the α parametrization, D ≥ 6 brane-induced gravity theories all correspond to α ≈ 0 in the far infrared [774].”
Cosmology and Fundamental Physics with the Euclid Satellite (2012, background): “Since the DGP model does not modify gravity enough in the IR, “cascading gravity” relies on the presence of at least two infinite extra dimensions, while our world is confined on a four-dimensional brane [398].”
Modified Gravity and Cosmology (2011, background): “Such generalisations are sometimes referred to as Brane Induced Gravity (BIG) models [448, 449, 450, 518, 436, 381, 386, 379, 338, 339, 669, 668].”
Massive Gravity (2014, background): “However, as shown in [240] and [135, 148, 132, 149], the straightforward extension of DGP to two large extra dimensions leads to ghost issues (sixth mode with the wrong sign kinetic term, see also [290, 70]) as well as divergences problems (see Refs.”
Galileon Cosmology (2009, background): “• The extension of our 4D theory to include multiple galileon fields should offer a reliable proxy for the cosmology of higher-dimensional DGP models, such as Cascading Gravity [55, 56, 57].”
Brane-World Gravity (2004, methodology): “to the 3-brane, this ghost disappears [111, 112, 113].”