857 citations · 4.9k across the 68 of their papers we have counts for
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astro-ph2002★ 192 cited
Large-scale curvature and entropy perturbations for multiple interacting fluids
Karim A. Malik, David Wands, Carlo Ungarelli
We present a gauge-invariant formalism to study the evolution of curvature perturbations in a Friedmann-Robertson-Walker universe filled by multiple interacting fluids. We resolve…
astro-ph2002★ 2 cited
The Kelvin-Helmholtz Instability in an Expanding Universe and its Effect on Dark Matter
Karim A. Malik, David R. Matravers
We extend the Kelvin-Helmholtz instability to an expanding background. We study the evolution of a non-viscous irrotational fluid and find that for wavelengths much smaller than th…
hep-th2002
Cosmological Brane Perturbations
Karim A. Malik
Two approaches to the study of cosmological perturbations in the brane-world scenario are compared: the first uses the 5D equations directly whereas the second approach projects th…