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A running spectral index in supersymmetric dark-matter models with quasistable charged particles

Profumo S
•
Sigurdson K
•
Ullio, Piero
•
Kamionkowski M.
2005
  • journal article

Periodico
PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY
Abstract
We show that charged particles decaying in the early Universe can induce a scale-dependent or running spectral index in the small-scale linear and nonlinear matter power spectrum and discuss examples of this effect in minimal supersymmetric models in which the lightest neutralino is a viable cold-dark-matter candidate. We find configurations in which the neutralino relic density is set by coannihilations with a long-lived stau and the late decay of staus partially suppresses the linear matter power spectrum. Nonlinear evolution on small scales then causes the modified linear power spectrum to evolve to a nonlinear power spectrum similar to (but different in detail) models parametrized by a constant running alpha(s)=dn(s)/dlnk by redshifts of 2 to 4. Thus, Lyman-alpha forest observations, which probe the matter power spectrum at these redshifts, might not discriminate between the two effects. However, a measurement of the angular power spectrum of primordial 21-cm radiation from redshift zapproximate to30-200 might distinguish between this charged-decay model and a primordial running spectral index. The direct production of a long-lived charged particle at future colliders is a dramatic prediction of this model.
DOI
10.1103/PhysRevD.71.023518
WOS
WOS:000226702700029
Archivio
http://hdl.handle.net/20.500.11767/14379
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84927716155
https://arxiv.org/abs/astro-ph/0410714
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closed access
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Data di acquisizione
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Mar 19, 2024
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