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The power spectrum amplitude from clusters revisited: σ_8 using simulations with preheating and cooling
Pedro T P Viana, Scott T Kay, Andrew R Liddle +2
The amplitude of density perturbations, for the currently-favoured LambdaCDM cosmology, is constrained using the observed properties of galaxy clusters. The catalogue used is that…
Primordial black holes in braneworld cosmologies: Accretion after formation
Raf Guedens, Dominic Clancy, Andrew R Liddle
We recently studied the formation and evaporation of primordial black holes in a simple braneworld cosmology, namely Randall-Sundrum Type II. Here we study the effect of accretion…
Evolution of large-scale perturbations in quintessence models
Michael Malquarti, Andrew R. Liddle
We carry out a comprehensive study of the dynamics of large-scale perturbations in quintessence scenarios. We model the contents of the Universe by a perfect fluid with equation of…
Supermassive black holes in scalar field galaxy halos
L. Arturo Urena-Lopez, Andrew R. Liddle
Ultra-light scalar fields provide an interesting alternative to WIMPS as halo dark matter. In this paper we consider the effect of embedding a supermassive black hole within such a…
Microwave background constraints on inflationary parameters
Samuel M Leach, Andrew R Liddle
We use a compilation of cosmic microwave anisotropy data (including the recent VSA, CBI and Archeops results), supplemented with an additional constraint on the expansion rate, to…
Primordial black holes in braneworld cosmologies: Formation, cosmological evolution and evaporation
Raf Guedens, Dominic Clancy, Andrew R Liddle
We consider the population evolution and evaporation of primordial black holes in the simplest braneworld cosmology, Randall-Sundrum type II. We demonstrate that black holes formin…