155 citations · 3.6k across the 84 of their papers we have counts for
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Anisotropic non-Gaussianity from vector field perturbations
Mindaugas Karciauskas, Konstantinos Dimopoulos, David H. Lyth
We suppose that a vector field perturbation causes part of the primordial curvature perturbation. The non-Gaussianity parameter fNL is then, in general, statistically anisotropic.…
Statistical anisotropy of the curvature perturbation from vector field perturbations
Konstantinos Dimopoulos, Mindaugas Karciauskas, David H. Lyth +1
The δN formula for the primordial curvature perturbation ζis extended to include vector as well as scalar fields. Formulas for the tree-level contributions to the spectrum and bisp…
The Curvaton Hypothesis and the eta-problem of Quintessential Inflation, with and without Branes
Konstantinos Dimopoulos
It is argued why, contrary to expectations, steep brane-inflation cannot really help in overcoming the eta-problem of quintessential inflation model-building. In contrast it is sho…
Modelling Quintessential Inflation with Branes
Konstantinos Dimopoulos
I discuss why quintessential inflation model-building is more natural in the context of brane cosmology and study the dynamics of a particular model as an example.
Models of Quintessential Inflation
Konstantinos Dimopoulos
A unified approach to quintessence and inflation is investigated with the use of a single scalar field. It is argued that successful potentials have to approximate a combination of…
Modeling Quintessential Inflation
K. Dimopoulos, J. W. F. Valle
We develop general criteria to construct unified frameworks for inflation and quintessence which employ a unique scalar field to drive both. By using such a minimal theoretical fra…