The preparation of mica cylinders for measurement of thermal conductivity

McDonald, André; Mirkovich, V. V.

doi:10.4095/307137

Cited by 4 publications

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“…Such a heavy S field might be identified with the messenger sector of gauge mediated SUSY breaking models. We will return to this possibility in a future study [43].…”

Section: Discussionmentioning

confidence: 97%

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keV warm dark matter via the supersymmetric Higgs portal

McDonald

Sahu

2009

Phys. Rev. D

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Warm dark matter (WDM) may resolve the possible conflict between observed galaxy halos and the halos produced in cold dark matter (CDM) simulations. Here we present an extension of MSSM to include WDM by adding a gauge singlet fermion, χ, with a portal-like coupling to the MSSM Higgs doublets. This model has the property that the dark matter is necessarily warm. In the case where M χ is mainly due to electroweak symmetry breaking, the χ mass is completely determined by its relic density and the reheating temperature, T R . For 10 2 GeV < ∼ T R < ∼ 10 5 GeV, the range allowed by χ production via thermal Higgs annihilation, the χ mass is in the range 0.3-4 keV, precisely the range required for WDM. The primordial phase-space density, Q, can directly account for that observed in dwarf spheroidal galaxies, Q ≈ 5 × 10 6 (eV/cm 3 )/(km/s) 3 , when the reheating temperature is in the range T R ≈ 10 − 100 TeV, in which case M χ ≈ 0.45 keV. The free-streaming length is in the range 0.3-4 Mpc, which can be small enough to alleviate the problems of overproduction of galaxy substructure and low angular momentum of CDM simulations. PACS numbers: 12.60.Jv, 98.80.Cq, 95.35.+d

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“…Such a heavy S field might be identified with the messenger sector of gauge mediated SUSY breaking models. We will return to this possibility in a future study [43].…”

Section: Discussionmentioning

confidence: 97%

“…However, existing constraints on WDM masses cannot be directly applied as the χ momentum distribution function due to thermal Higgs annihilation differs from those considered in existing studies. We will return to these issues in a future study [43].…”

Section: Discussionmentioning

confidence: 99%

keV warm dark matter via the supersymmetric Higgs portal

McDonald

Sahu

2009

Phys. Rev. D

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“…In the Z 2 -singlino model, the singlino mass will be entirely generated by the Higgs expectation value in the limit M χ → 0. We will consider the light Z 2 -singlino in a forthcoming paper [18].…”

Section: Discussionmentioning

confidence: 99%

Z₂-singlino dark matter in a portal-like extension of the minimal supersymmetric standard model

McDonald

Sahu

2008

J. Cosmol. Astropart. Phys.

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We propose a Z 2 -stabilised singlino (χ) as a dark matter candidate in extended and R-parity violating versions of the supersymmetric standard model. χ interacts with visible matter via a heavy messenger field S, which results in a supersymmetric version of the Higgs portal interaction. The relic abundance of χ can account for cold dark matter if the messenger mass satisfies M S < ∼ 10 4 GeV. Our model can be implemented in many realistic supersymmetric models such as the NMSSM and nMSSM. PACS numbers: 12.60.Jv, 98.80.Cq, 95.35.+d

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“…This requires that all parameters are simultaneously close to their 2-σ bounds. We will report on this analysis elsewhere[20].…”

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confidence: 99%

Hemispherical power asymmetry from scale-dependent modulated reheating

McDonald¹

2013

J. Cosmol. Astropart. Phys.

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We propose a new model for the hemispherical power asymmetry of the CMB based on modulated reheating. Non-Gaussianity from modulated reheating can be small enough to satisfy the bound from Planck if the dominant modulation of the inflaton decay rate is linear in the modulating field σ. σ must then acquire a spatiallymodulated power spectrum with a red scale-dependence. This can be achieved if the primordial perturbation of σ is generated via tachyonic growth of a complex scalar field. Modulated reheating due to σ then produces a spatially modulated and scale-dependent sub-dominant contribution to the adiabatic density perturbation. We show that it is possible to account for the observed asymmetry while remaining consistent with bounds from quasar number counts, non-Gaussianity and the CMB temperature quadupole. The model predicts that the adiabatic perturbation spectral index and its running will be modified by the modulated reheating component.

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The preparation of mica cylinders for measurement of thermal conductivity

Cited by 4 publications

References 0 publications

keV warm dark matter via the supersymmetric Higgs portal

keV warm dark matter via the supersymmetric Higgs portal

Z₂-singlino dark matter in a portal-like extension of the minimal supersymmetric standard model

Hemispherical power asymmetry from scale-dependent modulated reheating

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The preparation of mica cylinders for measurement of thermal conductivity

Cited by 4 publications

References 0 publications

keV warm dark matter via the supersymmetric Higgs portal

keV warm dark matter via the supersymmetric Higgs portal

Z2-singlino dark matter in a portal-like extension of the minimal supersymmetric standard model

Hemispherical power asymmetry from scale-dependent modulated reheating

Contact Info

Product

Resources

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Z₂-singlino dark matter in a portal-like extension of the minimal supersymmetric standard model