2k citations · 13.2k across the 79 of their papers we have counts for
79 papers
Perturbations of generic Kasner spacetimes and their stability
Lev Kofman, Jean-Philippe Uzan, Cyril Pitrou
This article investigates the stability of a generic Kasner spacetime to linear perturbations, both at late and early times. It demonstrates that the perturbation of the Weyl tenso…
Parameterizing and Measuring Dark Energy Trajectories from Late-Inflatons
Zhiqi Huang, J. Richard Bond, Lev Kofman
Bulk dark energy properties are determined by the redshift evolution of its pressure-to-density ratio, . An experimental goal is to decide if the dark energy is dynamica…
Reheating the Universe After Multi-Field Inflation
Neil Barnaby, Jonathan Braden, Lev Kofman
We study in detail (p)reheating after multi-field inflation models with a particular focus on N-flation. We consider a variety of different couplings between the inflatons and the…
Non-Gaussian Spikes from Chaotic Billiards in Inflation Preheating
J. Richard Bond, Andrei V. Frolov, Zhiqi Huang +1
A new class of non-Gaussian curvature fluctuations ζ_{pr} (\bx) \equiv δN(χ_i) arises from the post-inflation preheating behaviour of a non-inflaton field χ_i. Its billiard-like ch…
Non-Gaussianity as a Probe of the Physics of the Primordial Universe and the Astrophysics of the Low Redshift Universe
E. Komatsu, N. Afshordi, N. Bartolo +58
A new and powerful probe of the origin and evolution of structures in the Universe has emerged and been actively developed over the last decade. In the coming decade, non-Gaussiani…
Cosmological Fluctuations from Infra-Red Cascading During Inflation
Neil Barnaby, Zhiqi Huang, Lev Kofman +1
We propose a qualitatively new mechanism for generating cosmological fluctuations from inflation. The non-equilibrium excitation of interacting scalar fields often evolves into inf…