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Publications Influence

Galileon as a local modification of gravity

- A. Nicolis, R. Rattazzi, E. Trincherini
- Physics
- 13 November 2008

In the Dvali-Gabadadze-Porrati (DGP) model, the "self-accelerating" solution is plagued by a ghost instability, which makes the solution untenable. This fact, as well as all interesting departures… Expand

1,256 90- PDF

The String landscape, black holes and gravity as the weakest force

- N. Arkani-Hamed, L. Motl, A. Nicolis, C. Vafa
- Physics
- 2 January 2006

We conjecture a general upper bound on the strength of gravity relative to gauge forces in quantum gravity. This implies, in particular, that in a four-dimensional theory with gravity and a U(1)… Expand

716 88- PDF

Causality, analyticity and an IR obstruction to UV completion

- A. Adams, N. Arkani-Hamed, S. Dubovsky, A. Nicolis, R. Rattazzi
- Physics
- 20 February 2006

We argue that certain apparently consistent low-energy effective field theories described by local, Lorentzinvariant Lagrangians, secretly exhibit macroscopic non-locality and cannot be embedded in… Expand

559 39- PDF

Classical and Quantum Consistency of the DGP Model

- A. Nicolis, R. Rattazzi
- Physics
- 21 April 2004

We study the Dvali-Gabadadze-Porrati model by the method of the boundary effective action. The truncation of this action to the bending mode π consistently describes physics in a wide range of… Expand

433 28- PDF

Starting the Universe: Stable Violation of the Null Energy Condition and Non-standard Cosmologies

- P. Creminelli, M. Luty, A. Nicolis, L. Senatore
- Physics
- 12 June 2006

We present a consistent effective theory that violates the null energy condition (NEC) without developing any instabilities or other pathological features. The model is the ghost condensate with the… Expand

358 24- PDF

Cosmological non-linearities as an effective fluid

- D. Baumann, A. Nicolis, L. Senatore, M. Zaldarriaga
- Physics
- 14 April 2010

The universe is smooth on large scales but very inhomogeneous on small scales. Why is the spacetime on large scales modeled to a good approximation by the Friedmann equations? Are we sure that… Expand

292 20- PDF

CMBPol Mission Concept Study Probing Ination with CMB Polarization

- D. Baumann, M. Jackson, +56 authors M. Zaldarriaga
- Physics
- 24 November 2008

We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes of the physics of ination. We focus on the prospects for using CMB measurements

199 18- PDF

Solid Inflation

- S. Endlich, A. Nicolis, J. Wang
- Physics
- 1 October 2012

We develop a cosmological model where primordial inflation is driven by a ‘solid’, defined as a system of three derivatively coupled scalar fields obeying certain symmetries and spontaneously… Expand

148 18- PDF

Galilean Genesis: An Alternative to inflation

- P. Creminelli, A. Nicolis, E. Trincherini
- Physics
- 30 June 2010

We propose a novel cosmological scenario, in which standard inflation is replaced by an expanding phase with a drastic violation of the Null Energy Condition (NEC): >> H2. The model is based on the… Expand

246 18- PDF

Limits on non-Gaussianities from WMAP data

- P. Creminelli, A. Nicolis, L. Senatore, M. Tegmark, M. Zaldarriaga
- Physics
- 1 September 2005

We develop a method for constraining the level of non-Gaussianity of density perturbations when the three-point function is of the 'equilateral' type. Departures from Gaussianity of this form are… Expand

273 17- PDF

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