PMID: 11328000May 1, 2001Paper

Unitarity bounds and the cuspy halo problem

Physical Review Letters
L Hui

Abstract

Conventional cold dark matter cosmological models predict cuspy halos which are in apparent conflict with observations. We show that unitarity arguments imply interesting constraints on two proposals to address this problem: collisional dark matter and strongly annihilating dark matter. Efficient scattering in both implies m less, similar to 12 GeV and m less, similar to 25 GeV, respectively. We also show that the strong annihilation in the second scenario implies the presence of elastic scattering. Recent evidence suggests a collisional scenario where the cross section scales inversely with velocity--we argue superelastic processes are likely involved. Exceptions and implications for searches are discussed.

References

Feb 5, 1990·Physical Review Letters·K Griest, M Kamionkowski
Jan 6, 2000·The Astrophysical Journal·Y P Jing, Y Suto
Oct 6, 2000·Physical Review Letters·D N Spergel, P J Steinhardt

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Citations

Jun 16, 2018·Physical Review Letters·Samuel D McDermott
Jan 1, 2013·Living Reviews in Relativity·Luca AmendolaUNKNOWN Euclid Theory Working Group
Apr 21, 2018·Living Reviews in Relativity·Luca AmendolaUNKNOWN Euclid Theory Working Group
Sep 13, 2002·Physical Review Letters·Graciela GelminiShmuel Nussinov
Feb 1, 2008·Physical Review Letters·John F BeacomGregory D Mack
Oct 3, 2001·Physical Review Letters·A Kusenko, P J Steinhardt

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