Natural dark matter from type I string theory

King, Stephen F.; Roberts, J.

doi:10.1088/1126-6708/2007/01/024

Cited by 13 publications

(5 citation statements)

References 39 publications

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“…[44,45], and more recently in Refs. [46,47], that the MSSM also requires tuning in the relic density of the dark matter (ρ). To measure the tuning for some particular set, S ′ = {M ′ Z , ρ ′ }, of these observables we should determine how atypical predictions like S ′ are in the theory.…”

Section: Limitations Of the Traditional Measurementioning

confidence: 99%

New measure of fine tuning

Athron

Miller

2007

Phys. Rev. D

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The solution to fine tuning is one of the principal motivations for beyond the standard model (BSM) studies. However constraints on new physics indicate that many of these BSM models are also fine-tuned (although to a much lesser extent). To compare these BSM models it is essential that we have a reliable, quantitative measure of tuning. We review the measures of tuning used in the literature and propose an alternative measure. We apply this measure to several toy models and the minimal supersymmetric standard model.

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Section: Limitations Of the Traditional Measurementioning

confidence: 99%

New measure of fine tuning

Athron

Miller

2007

Phys. Rev. D

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“…Such an approach is very unconstrained. We would expect the gaugino masses to arise from a deeper theory such as string constructions, as studied in [21], [22] or in GUT models [23]- [25]. Both approaches generally impose specific relations between the gaugino masses at the GUT scale.…”

Section: Introductionmentioning

confidence: 99%

Natural dark matter in SUSY GUTs with non-universal gaugino masses

King

Roberts

Roy

2007

J. High Energy Phys.

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We consider neutralino dark matter within the framework of SUSY GUTs with non-universal gaugino masses. In particular we focus on the case of SU (5) with a SUSY breaking F-term in the 1, 24, 75 and 200 dimensional representations. We discuss the 24 case in some detail, and show that the bulk dark matter region cannot be accessed. We then go on to consider the admixture of the singlet SUSY breaking F-term with one of the 24, 75 or 200 dimensional F-terms, and show that in these cases it becomes possible to access the bulk regions corresponding to low fine-tuned dark matter. Our results are presented in the (M 1 , M 2 ) plane for fixed M 3 and so are useful for considering general GUT models, as well as more general non-universal gaugino models.

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“…We also find a significant stau region at large m A . These features are represented by points C15 and C14 respectively 9 . Comparing C15 directly to C2, we see from Table 8 that the dark matter fine-tuning is due primarily to m 0 and tan β.…”

Section: Sample (µ M a ) Planesmentioning

confidence: 99%

“…1 being particularly well-suited to provide the preferred amount of cold dark matter if it is the lightest supersymmetric particle (LSP) and weighs less than about 1 TeV [3,5]. Within the general supersymmetric framework, one may find more plausible regions of the supersymmetric parameter space that are less fine-tuned, in the sense that the values of the model parameters chosen at some high input scale require less delicate adjustment in order to obtain the correct value of the electroweak scale [1,6], as measured by M Z , or the correct value of the cold dark matter density Ω CDM h 2 [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons, we make no further apologies for considering the fine-tuning of Ω CDM h 2 in this paper, which we shall refer to as "dark matter fine-tuning" [7,8,9,10] to distinguish it from the more commonly studied "electroweak finetuning" [1,6], which we also consider for completeness. The issue of dark matter fine-tuning has been considered previously in the context of several different models including the constrained minimal supersymmetric extension of the Standard model (CMSSM) [7], in which the soft supersymmetry-breaking scalar masses m 0 , gaugino masses m 1/2 and trilinear parameters A 0 are each assumed to be universal, a more general MSSM with non-universal third family scalars and gaugino masses [8], a string-inspired non-universal model [9] and SUSY GUTs with non-universal gaugino masses [10]. Here we extend such considerations to models with non-universal soft supersymmetry-breaking contributions to the Higgs masses (NUHM).…”

Section: Introductionmentioning

confidence: 99%

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The fine-tuning price of neutralino dark matter in models with non-universal Higgs masses

Ellis¹,

King²,

Roberts³

2008

J. High Energy Phys.

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We study the amounts of fine-tuning of the parameters of the MSSM with non-universal soft supersymmetry-breaking contributions to the Higgs masses (the NUHM) that would be required for the relic neutralino density to lie within the range favoured by WMAP and other astrophysical and cosmological observations. Such dark matter fine-tuning is analogous to the commonly studied electroweak fine-tuning associated with satisfying the electroweak symmetry breaking conditions, which we also study for completeness. We identify several distinct regions of the NUHM parameter space: a bulk region, aτ −χ 0 1 coannihilation region, a pseudoscalar Higgs funnel region, a focus-point bino/higgsino region and aν −χ 0 1 coannihilation region. Within each region, we analyse specific representative points for which we provide breakdowns of the contributions to the dark matter fine-tuning associated with the different NUHM parameters. In general, the NUHM offers points with both smaller and larger amounts of dark matter fine-tuning than points in the corresponding regions of the CMSSM. Lower amounts of dark matter fine-tuning typically arise at points where several different (co)annihilation processes contribute, e.g., at junctions between regions with different dominant processes. We comment on the prospects for using collider measurements to estimate the likely dark matter density within the NUHM framework.It is important to note that the parameters we refer to here are the GUT-scale

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Natural dark matter from type I string theory

Cited by 13 publications

References 39 publications

New measure of fine tuning

New measure of fine tuning

Natural dark matter in SUSY GUTs with non-universal gaugino masses

The fine-tuning price of neutralino dark matter in models with non-universal Higgs masses

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