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Healthy theories beyond Horndeski

- J'erome Gleyzes, D. Langlois, F. Piazza, F. Vernizzi
- Physics
- 25 April 2014

Jérôme Gleyzes, 2 David Langlois, Federico Piazza, 4 and Filippo Vernizzi CEA, Institut de Physique Théorique, F-91191 Gif-sur-Yvette cédex, CNRS, Unité de recherche associée-2306, F-91191… Expand

Exploring gravitational theories beyond Horndeski

- J'erome Gleyzes, D. Langlois, F. Piazza, F. Vernizzi
- Physics
- 8 August 2014

We have recently proposed a new class of gravitational scalar-tensor theories free from Ostrogradski instabilities, in arXiv:1404.6495. As they generalize Horndeski theories, or "generalized"… Expand

Essential Building Blocks of Dark Energy

- J'erome Gleyzes, D. Langlois, F. Piazza, F. Vernizzi
- Physics
- 17 April 2013

We propose a minimal description of single field dark energy/modified gravity within the effective field theory formalism for cosmological perturbations, which encompasses most existing models. We… Expand

The effective field theory of dark energy

- Giulia Gubitosi, F. Piazza, F. Vernizzi
- Physics
- 30 September 2012

We propose a universal description of dark energy and modified gravity that includes all single-field models. By extending a formalism previously applied to inflation, we consider the metric… Expand

Violations of the equivalence principle in a dilaton-runaway scenario

- T. Damour, F. Piazza, G. Veneziano
- Physics
- 13 May 2002

We explore a version of the cosmological dilaton-fixing and decoupling mech- anism in which the dilaton-dependence of the low-energy effective action is extremized for infinitely large values of the… Expand

Runaway dilaton and equivalence principle violations.

- T. Damour, F. Piazza, G. Veneziano
- Physics, Medicine
- Physical review letters
- 30 April 2002

In a recently proposed scenario, where the dilaton decouples while cosmologically attracted towards infinite bare string coupling, its residual interactions can be related to the amplitude of density… Expand

Spontaneous symmetry probing

- A. Nicolis, F. Piazza
- Physics
- 21 December 2011

A bstractFor relativistic quantum field theories, we consider Lorentz breaking, spatially homogeneous field configurations or states that evolve in time along a symmetry direction. We dub this… Expand

Rapidly-Varying Speed of Sound, Scale Invariance and Non-Gaussian Signatures

We show that curvature perturbations acquire a scale invariant spectrum for any constant equation of state, provided the fluid has a suitably time-dependent sound speed. In order for modes to exit… Expand

Zoology of condensed matter: framids, ordinary stuff, extra-ordinary stuff

- A. Nicolis, R. Penco, F. Piazza, R. Rattazzi
- Physics
- 15 January 2015

A bstractWe classify condensed matter systems in terms of the spacetime symmetries they spontaneously break. In particular, we characterize condensed matter itself as any state in a… Expand

More on gapped Goldstones at finite density: more gapped Goldstones

- A. Nicolis, R. Penco, F. Piazza, Rachel A. Rosen
- Physics
- 5 June 2013

A bstractIt was recently argued that certain relativistic theories at finite density can exhibit an unconventional spectrum of Goldstone excitations, with gapped Goldstones whose gap is exactly… Expand

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