Can a vector field be responsible for the curvature perturbation in the Universe
- K. Dimopoulos
- Physics
- 20 July 2006
I investigate the possibility that the observed curvature perturbation is due to a massive vector field. To avoid generating a large scale anisotropy the vector field is not taken to be driving…
Statistical anisotropy of the curvature perturbation from vector field perturbations.
- K. Dimopoulos, Mindaugas Karčiauskas, D. Lyth, Yeinzon Rodriguez Department of Physics Lancaster University, C. D. I. U. A. Narino, Escuela de Fisica Universidad Industrial de Santander
- Physics, Mathematics
- 5 September 2008
The δN formula for the primordial curvature perturbation ζ is extended to include vector as well as scalar fields. Formulas for the tree-level contributions to the spectrum and bispectrum of ζ are…
Vector curvaton with varying kinetic function
- K. Dimopoulos, Mindaugas Karčiauskas, Jacques M. Wagstaff
- Physics
- 10 July 2009
A new model realization of the vector curvaton paradigm is presented and analyzed. The model consists of a single massive Abelian vector field, with a Maxwell-type kinetic term. By assuming that the…
A-term inflation and the MSSM
- J. C. B. Sánchez, K. Dimopoulos, D. Lyth
- Physics
- 28 August 2006
The parameter space for A-term inflation is explored with W = �pp /pM p−3 P. With p = 6 andp ∼ 1, the observed spectrum and spectral tilt can be obtained with soft mass of order 10 2 GeV but not with…
Particle Production of Vector Fields: Scale Invariance is Attractive
- K. Dimopoulos, Jacques M. Wagstaff
- Physics
- 10 November 2010
In a model of an Abelian vector boson with a Maxwell kinetic term and non-negative mass-squared it is demonstrated that, under fairly general conditions during inflation, a scale-invariant spectrum…
Quintessential inflation with α-attractors
- K. Dimopoulos, Charlotte Owen
- Physics
- 28 February 2017
A novel approach to quintessential inflation model building is studied, within the framework of α-attractors, motivated by supergravity theories. Inflationary observables are in excellent agreement…
Vector curvaton without instabilities
- K. Dimopoulos, Mindaugas Karčiauskas, Jacques M. Wagstaff
- Physics
- 2 September 2009
Anisotropic non-Gaussianity from vector field perturbations
- Mindaugas Karčiauskas, K. Dimopoulos, D. Lyth
- Physics
- 1 December 2008
We suppose that a vector field perturbation causes part of the primordial curvature perturbation. The non-Gaussianity parameter f_NL is then, in general, statistically anisotropic. We calculate its…
Non-minimally coupled vector curvaton
- K. Dimopoulos, Mindaugas Karčiauskas
- Physics
- 20 March 2008
It is shown that a massive Abelian vector boson field can generate the curvature perturbation in the Universe, when coupled non-minimally to gravity, through an RA2 coupling. The vector boson acts as…
The Curvaton as a pseudoNambu-Goldstone boson.
- K. Dimopoulos, D. Lyth, A. Notari, A. Riotto
- Physics
- 4 April 2003
The field responsible for the cosmological curvature perturbations generated during a stage of primordial inflation might be the ``curvaton'', a field different from the inflaton field. To keep the…
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