Dark matter from late decays and the small-scale structure problems

Francesca Borzumati, Torsten Bringmann, Piero Ullio

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

The generation of dark matter in late decays of quasistable massive particles has been proposed as a viable framework to address the excess of power found in numerical N-body simulations for cold dark matter cosmologies. We identify a convenient set of variables to illustrate which requirements need to be satisfied in any generic particle-physics model to address the small-scale problems and to fulfill other astrophysical constraints. As a result of this model-independent analysis, we point out that meeting these requirements in a completely natural way is inherently difficult. In particular, we reexamine the role of gravitinos and Kaluza-Klein gravitons in this context and find them disfavored as a solution to the small-scale problems in case they are dark matter candidates generated in the decay of thermally produced weakly interacting massive particles. We propose right-handed sneutrinos and right-handed Kaluza-Klein neutrinos as alternatives. We find that they are viable dark matter candidates, but that they can contribute to a solution of the small-scale problems only in case the associated Dirac neutrino mass term appears as a subdominant contribution in the neutrino mass matrix.

Original languageEnglish
Article number063514
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number6
DOIs
Publication statusPublished - 2008 Mar 12
Externally publishedYes

Fingerprint

dark matter
neutrinos
decay
requirements
gravitinos
weakly interacting massive particles
gravitons
astrophysics
physics
matrices
simulation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Dark matter from late decays and the small-scale structure problems. / Borzumati, Francesca; Bringmann, Torsten; Ullio, Piero.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 77, No. 6, 063514, 12.03.2008.

Research output: Contribution to journalArticle

@article{87ab968b017644a19e703be513d9ab8c,
title = "Dark matter from late decays and the small-scale structure problems",
abstract = "The generation of dark matter in late decays of quasistable massive particles has been proposed as a viable framework to address the excess of power found in numerical N-body simulations for cold dark matter cosmologies. We identify a convenient set of variables to illustrate which requirements need to be satisfied in any generic particle-physics model to address the small-scale problems and to fulfill other astrophysical constraints. As a result of this model-independent analysis, we point out that meeting these requirements in a completely natural way is inherently difficult. In particular, we reexamine the role of gravitinos and Kaluza-Klein gravitons in this context and find them disfavored as a solution to the small-scale problems in case they are dark matter candidates generated in the decay of thermally produced weakly interacting massive particles. We propose right-handed sneutrinos and right-handed Kaluza-Klein neutrinos as alternatives. We find that they are viable dark matter candidates, but that they can contribute to a solution of the small-scale problems only in case the associated Dirac neutrino mass term appears as a subdominant contribution in the neutrino mass matrix.",
author = "Francesca Borzumati and Torsten Bringmann and Piero Ullio",
year = "2008",
month = "3",
day = "12",
doi = "10.1103/PhysRevD.77.063514",
language = "English",
volume = "77",
journal = "Physical review D: Particles and fields",
issn = "1550-7998",
publisher = "American Institute of Physics Publising LLC",
number = "6",

}

TY - JOUR

T1 - Dark matter from late decays and the small-scale structure problems

AU - Borzumati, Francesca

AU - Bringmann, Torsten

AU - Ullio, Piero

PY - 2008/3/12

Y1 - 2008/3/12

N2 - The generation of dark matter in late decays of quasistable massive particles has been proposed as a viable framework to address the excess of power found in numerical N-body simulations for cold dark matter cosmologies. We identify a convenient set of variables to illustrate which requirements need to be satisfied in any generic particle-physics model to address the small-scale problems and to fulfill other astrophysical constraints. As a result of this model-independent analysis, we point out that meeting these requirements in a completely natural way is inherently difficult. In particular, we reexamine the role of gravitinos and Kaluza-Klein gravitons in this context and find them disfavored as a solution to the small-scale problems in case they are dark matter candidates generated in the decay of thermally produced weakly interacting massive particles. We propose right-handed sneutrinos and right-handed Kaluza-Klein neutrinos as alternatives. We find that they are viable dark matter candidates, but that they can contribute to a solution of the small-scale problems only in case the associated Dirac neutrino mass term appears as a subdominant contribution in the neutrino mass matrix.

AB - The generation of dark matter in late decays of quasistable massive particles has been proposed as a viable framework to address the excess of power found in numerical N-body simulations for cold dark matter cosmologies. We identify a convenient set of variables to illustrate which requirements need to be satisfied in any generic particle-physics model to address the small-scale problems and to fulfill other astrophysical constraints. As a result of this model-independent analysis, we point out that meeting these requirements in a completely natural way is inherently difficult. In particular, we reexamine the role of gravitinos and Kaluza-Klein gravitons in this context and find them disfavored as a solution to the small-scale problems in case they are dark matter candidates generated in the decay of thermally produced weakly interacting massive particles. We propose right-handed sneutrinos and right-handed Kaluza-Klein neutrinos as alternatives. We find that they are viable dark matter candidates, but that they can contribute to a solution of the small-scale problems only in case the associated Dirac neutrino mass term appears as a subdominant contribution in the neutrino mass matrix.

UR - http://www.scopus.com/inward/record.url?scp=41449111633&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=41449111633&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.77.063514

DO - 10.1103/PhysRevD.77.063514

M3 - Article

VL - 77

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 6

M1 - 063514

ER -