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Adiabatic and entropy perturbations with interacting fluids and fields
Karim A. Malik, David Wands
We develop a gauge-invariant formalism for the study of density perturbations in a Friedmann-Robertson-Walker universe with multiple interacting fluids and/or scalar fields. We sho…
Scalar perturbations from brane-world inflation
K. Koyama, D. Langlois, R. Maartens +1
We investigate the scalar metric perturbations about a de Sitter brane universe in a 5-dimensional anti de Sitter bulk. We compare the master-variable formalism, describing metric…
Induced gravity with a non-minimally coupled scalar field on the brane
Mariam Bouhmadi-Lopez, David Wands
We present the four-dimensional equations on a brane with a scalar field non-minimally coupled to the induced Ricci curvature, embedded in a five-dimensional bulk with a cosmologic…
Gravitational waves from brane-world inflation with induced gravity
Mariam Bouhmadi-Lopez, Roy Maartens, David Wands
We calculate the amplitude of gravitational waves produced by inflation on a de Sitter brane embedded in five-dimensional anti-de Sitter bulk spacetime, extending previous calculat…
Cosmological perturbations through a simple bounce
Laura E. Allen, David Wands
We present a detailed study of a simple scalar field model that yields non-singular cosmological solutions. We study both the qualitative dynamics of the homogeneous and isotropic…