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Covariant Galileon

- C. Deffayet, G. Esposito-Farèse, A. Vikman
- Physics
- 9 January 2009

Abstract We consider the recently introduced “galileon” field in a dynamical spacetime. When the galileon is assumed to be minimally coupled to the metric, we underline that both field equations of… Expand

613 24- PDF

From k-essence to generalised Galileons

- C. Deffayet, Xian Gao, D. Steer, G. Zahariade
- Physics
- 16 March 2011

We determine the most general scalar field theories which have an action that depends on derivatives of order two or less, and have equations of motion that stay second order and lower on flat… Expand

686 21- PDF

Imperfect Dark Energy from Kinetic Gravity Braiding

- C. Deffayet, O. Pujolàs, I. Sawicki, A. Vikman
- Physics
- 31 July 2010

We introduce a large class of scalar-tensor models with interactions containing the second derivatives of the scalar field but not leading to additional degrees of freedom. These models exhibit… Expand

459 19- PDF

Brane cosmological evolution in a bulk with cosmological constant

- P. Bin'etruy, C. Deffayet, U. Ellwanger, D. Langlois
- Physics
- 27 October 1999

Abstract We consider the cosmology of a “3-brane universe” in a five dimensional (bulk) space-time with a cosmological constant. We show that Einstein's equations admit a first integral, analogous to… Expand

759 17- PDF

Non-conventional cosmology from a brane-universe

- P. Bin'etruy, C. Deffayet, D. Langlois
- Physics
- 3 May 1999

Abstract We consider “brane universes”, where energy density is confined to four-dimensional hypersurfaces (three-branes) whereas one extra compact dimension is felt by gravity only. We show that the… Expand

756 14- PDF

Cosmology on a Brane in Minkowski Bulk

- C. Deffayet
- Physics
- 23 October 2000

Abstract We discuss the cosmology of a 3-brane embedded in a 5D bulk space–time with a cosmological constant when an intrinsic curvature Ricci scalar is included in the brane action. After deriving… Expand

655 11- PDF

Accelerated universe from gravity leaking to extra dimensions

- C. Deffayet, G. Dvali, G. Gabadadze
- Physics
- 4 May 2001

We discuss the idea that the accelerated universe could be the result of gravitational leakage into extra dimensions over Hubble distances rather than the consequence of a nonzero cosmological… Expand

821 10- PDF

Generalized Galileons: All scalar models whose curved background extensions maintain second-order field equations and stress tensors

- C. Deffayet, S. Deser, G. Esposito-Farèse
- Physics
- 10 June 2009

We extend to curved backgrounds all flat-space scalar field models that obey purely second-order equations, while maintaining their second-order dependence on both field and metric. This extension… Expand

500 8- PDF

Ghosts, strong coupling and accidental symmetries in massive gravity

- C. Deffayet, Jan-Willem Rombouts
- Physics
- 26 May 2005

We show that the strong self-interaction of the scalar polarization of a massive graviton can be understood in terms of the propagation of an extra ghostlike degree of freedom, thus relating strong… Expand

104 8- PDF

Nonperturbative Continuity in Graviton Mass versus Perturbative Discontinuity

- C. Deffayet, G. Dvali, G. Gabadadze, A. Vainshtein
- Physics
- 1 June 2001

We address the question whether a graviton could have a small nonzero mass. The issue is subtle for two reasons: there is a discontinuity in the mass in the lowest tree-level approximation, and,… Expand

396 7- PDF

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