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8 papers · 2 filters
Cosmological parameter estimation and the spectral index from inflation
Edmund J Copeland, Ian J Grivell, Andrew R Liddle
Accurate estimation of cosmological parameters from microwave background anisotropies requires high-accuracy understanding of the cosmological model. Normally, a power-law spectrum…
Primordial black holes and early cosmology
Andrew R Liddle, Anne M Green
We describe the changes to the standard primordial black hole constraints on density perturbations if there are modifications to the standard cosmology between the time of formatio…
Perturbation evolution in cosmologies with a decaying cosmological constant
Pedro T P Viana, Andrew R Liddle
Structure formation models with a cosmological constant are successful in explaining large-scale structure data, but are threatened by the magnitude-redshift relation for Type Ia s…
Primordial black hole constraints in cosmologies with early matter domination
Anne M Green, Andrew R Liddle, Antonio Riotto
Moduli fields, a natural prediction of any supergravity and superstring-inspired supersymmetry theory, may lead to a prolonged period of matter domination in the early Universe. Th…
Constraints on the density perturbation spectrum from primordial black holes
Anne M Green, Andrew R Liddle
We re-examine the constraints on the density perturbation spectrum, including its spectral index , from the production of primordial black holes. The standard cosmology, where t…
On the instability of the one-texture universe
Xuelei Chen, Mark Hindmarsh, Marc Kamionkowski +1
The one-texture universe, introduced by Davis in 1987, is a homogeneous mapping of a scalar field with an vacuum into a closed universe. It has long been known to mathematici…