Two natural scenarios for dark matter particles coexisting with supersymmetry

Abstract

We describe two natural scenarios in which both dark matter WIMPs (weakly interacting massive particles) and a variety of supersymmetric partners should be discovered in the foreseeable future. In the first scenario, the WIMPs are neutralinos, but they are only one component of the dark matter, which is dominantly composed of other relic particles such as axions. (This is the multicomponent model of Baer, Barger, Sengupta, and Tata.) In the second scenario, the WIMPs result from an extended Higgs sector and may be the only dark matter component. In either scenario, both the dark matter WIMP and a plethora of other neutral and charged particles await discovery at many experimental facilities. The new particles in the second scenario have far weaker cross-sections for direct and indirect detection via their gauge interactions, which are either momentum-dependent or second-order. However, as we point out here, they should have much stronger interactions via the Higgs. We estimate that their interactions with fermions will then be comparable to (although not equal to) those of neutralinos with a corresponding Higgs interaction. It follows that these newly proposed dark matter particles should be within reach of emerging and proposed facilities for direct, indirect, and collider-based detection.

The sounds of science—a symphony for many instruments and voices

“…Less often emphasized is the brilliant demonstration of Gibbons and Hawking [144]) that the Euclidean path integral Z BH of a general black hole yields exactly the right form for the Bekenstein-Hawking entropy, if it can be interpreted as a true thermodynamic partition function (ultimately based on microstates). It has recently been pointed out [145] that this is the case in a theory [146], with other merits including the prediction of a credible dark matter particle [147][148][149], in which the Euclidean action S E of any stationary system (including rotating black holes) fundamentally originates as an entropy S. In this theory, Gibbons and Hawking (see figures 20 and 21) have explained the Bekenstein-Hawking entropy of all black holes-beginning with real black holes of any kind in a universe with three spatial dimensions, and with an argument that can even apparently be extended to higher dimensions.…”

A multicomponent dark matter scenario and the experimental evidence supporting it

“…This is a review of a recently proposed scenario with two coexisting stable dark matter WIMPs -a neutralino [1,2,3] and the particle that we have called a Higgson [4,5,6,7] and represented by H 0 , to distinguish this variety of particle -generically labeled H -from Higgs bosons h and Higgsinos h. (There are both neutral and charged particles in each of these three varieties.) Let us begin with four central theorems:…”

“…The last two theorems, given below, require an introduction: In the extended Higgs description of Refs. [4,5,6,7], Higgs fields are interpreted as the complex scalar amplitudes φ of multicomponent fields Φ = φ χ, where χ is a constant spinor. Each Φ R can be represented by a sum over the complete orthonormal set of Higgson mass eigenstates H i , now regarded as basis functions:…”

“…Here, however, we regard the Lagrangian of Refs. [4,5,6,7] as being phenomenological rather than derived from Ref. [22].)…”