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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
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
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
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
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
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
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
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
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
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
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