1.5k citations · 12.4k across the 121 of their papers we have counts for
4 papers · 2 filters
Models of coupled dark matter to dark energy
A. Pourtsidou, C. Skordis, E. J. Copeland
We present three distinct types of models of dark energy in the form of a scalar field which is explicitly coupled to dark matter. Our construction draws from the pull-back formali…
Gravitational Waves from Oscillon Preheating
Shuang-Yong Zhou, Edmund J. Copeland, Richard Easther +3
Oscillons are long-lived, localized excitations of nonlinear scalar fields which may be copiously produced during preheating after inflation, leading to a possible oscillon-dominat…
The Dark Energy Cosmic Clock: A New Way to Parametrise the Equation of State
Ewan R. M. Tarrant, Edmund J. Copeland, Antonio Padilla +1
We propose a completely new parametrisation of the dark energy equation of state, which uses the dark energy density, as a cosmic clock. We expand the equation of state in a…
Influence of Reheating on the Trispectrum and its Scale Dependence
Godfrey Leung, Ewan R. M. Tarrant, Christian T. Byrnes +1
We study the evolution of the non-linear curvature perturbation during perturbative reheating, and hence how observables evolve to their final values which we may compare against o…