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Title: Dynamical Dark Matter from strongly-coupled dark sectors

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 4; Related Information: CHORUS Timestamp: 2017-02-23 15:20:08; Journal ID: ISSN 2470-0010
American Physical Society
Country of Publication:
United States

Citation Formats

Dienes, Keith R., Huang, Fei, Su, Shufang, and Thomas, Brooks. Dynamical Dark Matter from strongly-coupled dark sectors. United States: N. p., 2017. Web. doi:10.1103/PhysRevD.95.043526.
Dienes, Keith R., Huang, Fei, Su, Shufang, & Thomas, Brooks. Dynamical Dark Matter from strongly-coupled dark sectors. United States. doi:10.1103/PhysRevD.95.043526.
Dienes, Keith R., Huang, Fei, Su, Shufang, and Thomas, Brooks. Wed . "Dynamical Dark Matter from strongly-coupled dark sectors". United States. doi:10.1103/PhysRevD.95.043526.
title = {Dynamical Dark Matter from strongly-coupled dark sectors},
author = {Dienes, Keith R. and Huang, Fei and Su, Shufang and Thomas, Brooks},
abstractNote = {},
doi = {10.1103/PhysRevD.95.043526},
journal = {Physical Review D},
number = 4,
volume = 95,
place = {United States},
year = {Wed Feb 22 00:00:00 EST 2017},
month = {Wed Feb 22 00:00:00 EST 2017}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1103/PhysRevD.95.043526

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Cited by: 4works
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  • Cosmologies including strongly Coupled (SC) Dark Energy (DE) and Warm dark matter (SCDEW) are based on a conformally invariant (CI) attractor solution modifying the early radiative expansion. Then, aside of radiation, a kinetic field Φ and a DM component account for a stationary fraction, ∼ 1 %, of the total energy. Most SCDEW predictions are hardly distinguishable from LCDM, while SCDEW alleviates quite a few LCDM conceptual problems, as well as its difficulties to meet data below the average galaxy scale. The CI expansion begins at the end of inflation, when Φ (future DE) possibly plays a role in reheating,more » and ends at the Higgs scale. Afterwards, a number of viable options is open, allowing for the transition from the CI expansion to the present Universe. In this paper: (i) We show how the attractor is recovered when the spin degrees of freedom decreases. (ii) We perform a detailed comparison of CMB anisotropy and polarization spectra for SCDEW and LCDM, including tensor components, finding negligible discrepancies. (iii) Linear spectra exhibit a greater parameter dependence at large k 's, but are still consistent with data for suitable parameter choices. (iv) We also compare previous simulation results with fresh data on galaxy concentration. Finally, (v) we outline numerical difficulties at high k . This motivates a second related paper [1], where such problems are treated in a quantitative way.« less
  • Scale invariance may be a classical symmetry which is broken radiatively. This provides a simple way to stabilize the scale of electroweak symmetry breaking against radiative corrections. But for such a theory to be fully realistic, it must actually incorporate a hierarchy of scales, including the Planck and the neutrino mass scales in addition to the electroweak scale. The dark matter sector and the physics responsible for baryogenesis may or may not require new scales, depending on the scenario. We develop a generic way of using hidden sectors to construct a technically-natural hierarchy of scales in the framework of classicallymore » scale-invariant theories. We then apply the method to generate the Planck mass and to solve the neutrino mass and dark matter problems through what may be termed the ''scale-invariant standard model.'' The model is perturbatively renormalizable for energy scales up to the Planck mass.« less
  • In anomaly-mediated supersymmetry breaking models, superpartner masses are proportional to couplings squared. Their hidden sectors therefore naturally contain WIMPless dark matter, particles whose thermal relic abundance is guaranteed to be of the correct size, even though they are not weakly interacting massive particles. We study viable dark matter candidates in WIMPless anomaly-mediated supersymmetry breaking models with non-Abelian hidden sectors and highlight unusual possibilities that emerge in even the simplest models. In one example with a pure SU(N) hidden sector, stable hidden gluinos freeze out with the correct relic density, but have an extremely low, but natural, confinement scale, providing amore » framework for self-interacting dark matter. In another simple scenario, hidden gluinos freeze out and decay to visible Winos with the correct relic density, and hidden glueballs may either be stable, providing a natural framework for mixed cold-hot dark matter, or may decay, yielding astrophysical signals. Last, we present a model with light hidden pions that may be tested with improved constraints on the number of nonrelativistic degrees of freedom. All of these scenarios are defined by a small number of parameters, are consistent with gauge coupling unification, preserve the beautiful connection between the weak scale and the observed dark matter relic density, and are natural, with relatively light visible superpartners. We conclude with comments on interesting future directions.« less
  • A dual component made of non-relativistic particles and a scalar field, exchanging energy, naturally falls onto an attractor solution, making them a (sub)dominant part of the cosmic energy during the radiation dominated era, provided that the constant β, measuring the coupling, is strong enough. The density parameters of both components are then constant, as they expand as a{sup −4}. If the field energy is then prevalently kinetic, as is expected, its energy is exactly half of the pressureless component; the dual component as a whole, then, has a density parameter Ω{sub cd} = 3/4β{sup 2} (e.g., for β ≅ 2.5,more » Ω{sub cd} ≅ 0.1, in accordance with Dark Radiation expectations). The stationary evolution can only be broken by the rising of other component(s), expanding as a{sup −3}. In a realistic scenario, this happens when z ∼ 3–5 × 10{sup 3}. When such extra component(s) become(s) dominant, the densities of the dual components also rise above radiation. The scalar field behavior can be easily tuned to fit Dark Energy data, while the coupled DM density parameter becomes O(10{sup −3}). This model however requires that, at present, two different DM components exist. The one responsible for the break of the stationary regime could be made, e.g., by thermally distributed particles with mass even >> 1–2 keV (or non-thermal particles with analogous average speed) so accounting for the size of observed galactic cores; in fact, a fair amount of small scale objects is however produced by fluctuation re-generated by the coupled DM component, in spite of its small density parameter, after the warm component has become non-relativistic.« less
  • We obtain from first principles, i.e., from the quark-gluon dynamics, the Gell'Mann-Ne'eman baryonic eightfold way energy momentum spectrum exactly in an imaginary-time functional integral formulation of strongly coupled lattice quantum chromodynamics in 3+1 dimensions, with local SU(3){sub c} gauge and global SU(3){sub f} flavor symmetries. We take the hopping parameter {kappa} and the pure gauge coupling {beta} satisfying the strong coupling regime condition 0{<=}{beta}<<{kappa}<<1. The form of the 56 baryon fields emerges naturally from the dynamics and is unveiled using the hyperplane decoupling method. There is no a priori guesswork. In the associated physical quantum mechanical Hilbert space H, spectralmore » representations are derived for the two-baryon functions, which are used to rigorously detect the particles in the energy-momentum spectrum. Using the SU(3){sub f} symmetry, the 56 baryon states admit a decomposition into 8x2 states associated with a spin 1/2 octet and 10x4 states associated with a spin 3/2 decuplet. The states are labeled by the quantum numbers of total hypercharge Y, total isospin I, its third component I{sub 3}, and the value of the quadratic Casimir of SU(3){sub f}; they also carry a label of total spin J and its z component J{sub z}. The total spin operators are defined using {pi}/2 rotations about the spatial coordinate axes and for improper zero momentum baryon states agree with the infinitesimal generators of the continuum. We show there is a partial restoration of continuous rotational symmetry which implies that all the octet (decuplet) masses are the same. For {beta}=0, the masses of the 56 baryon states have the form M=-3 ln {kappa}-3{kappa}{sup 3}/4+{kappa}{sup 6}r({kappa}), with r({kappa}) analytic. There is no mass splitting within the octet (decuplet). However, we find an octet-decuplet mass splitting given by 3{kappa}{sup 6}/4+O({kappa}{sup 7}). For {beta}=0, [M({kappa},{beta})-(-3 ln{kappa})], the non-singular part of the masses, is analytic in {kappa} and {beta} and the mass splitting persists for {beta}{ne}0. For spatial momentum p{ne}0, p=(p{sup 1},p{sup 2},p{sup 3})(set-membership sign)(-{pi},{pi}]{sup 3}, the 56 baryon dispersion curves have the form w({kappa},p)=-3 ln {kappa}-3{kappa}{sup 3}/4+{kappa}{sup 3}{sigma}{sub j=1,2,3}(1-cos p{sup j})/4+r({kappa},p), where r({kappa},p) is of O({kappa}{sup 6}). For the octet, r({kappa},p) is jointly analytic in {kappa} and in each p{sup j} for small |Im p{sup j}|. For each baryon, there is an antibaryon related to it by charge conjugation and with identical spectral properties. It is shown that the spectrum associated with baryons and antibaryons is the only spectrum in the subspace of H with an odd number of quarks, up to near the meson-baryon energy threshold of {approx_equal}-5 ln {kappa}. A new time reflection is found which is used to define a local spin flip symmetry. The spin flip symmetry, together with the usual parity, time reversal, and spatial {pi}/2 rotation symmetries and analytic implicit function arguments, are used to obtain these results. Our method extends to the SU(N){sub f} case to uncover (2N+2){exclamation_point}/[3{exclamation_point}(2N-1){exclamation_point}] baryon states and also to treat mesons. Coupling our baryon results with our similar results for the eightfold mesons (of asymptotic mass -2 ln{kappa}) shows that the model exhibits confinement up to near the two-meson threshold.« less