Year: 2001
Type: article
Abstract: Hannestad and Scherrer analyzed self-interacting warm and hot dark matter (HDM) and found power spectra in disagreement with previous papers. We argue that they include self-interactions in a weak-coupling approximation, as for photons after recombination. The ``tightly coupled'' approximation used for prerecombination photons, and previous discussions of self-interacting HDM, would have been more appropriate. Their approximation generates a Boltzmann hierarchy leading to a stiff system of equations. Furthermore, contamination by gauge modes could invalidate their results.
Authors: Fernando Atrio-Barandela, Sacha Davidson
Institution: Universidad de Salamanca
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2051946925