Phys. Rev. D 64, 088301 (2001) [2 pages]Comment on “Self-interacting warm dark matter”Received 26 February 2001; published 24 September 2001 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.64.088301
DOI:
10.1103/PhysRevD.64.088301
PACS:
95.35.+d, 14.80.-j, 98.65.Dx
See AlsoOriginal Article: Steen Hannestad and Robert J. Scherrer, Self-interacting warm dark matter, Phys. Rev. D 62, 043522 (2000). |
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