Current dark matter annihilation constraints from CMB and low-redshift data

Madhavacheril, Mathew S.; Sehgal, Neelima; Slatyer, Tracy R.

doi:10.1103/physrevd.89.103508

Cited by 198 publications

(257 citation statements)

References 59 publications

(114 reference statements)

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“…Observations of the ionization history of the Universe from the cosmic microwave background (CMB) constrain DM annihilation during recombination [82,83], in particular the process XX → φφ → e + e − e + e − . A recent analysis combining several cosmological datasets found m X > 30 GeV for σv ann fixed by relic abundance and if BR(φ → e + e − ) = 1 [84,85], as in the case of kinetic mixing. Implications for indirect detection searches (e.g., Fermi and AMS-2) are also important and will be considered elsewhere [86].…”

Section: Portals For Light Mediatorsmentioning

confidence: 99%

Direct detection portals for self-interacting dark matter

Kaplinghat

Tulin²,

Yu³

2014

Phys. Rev. D

165

229

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Dark matter self-interactions can affect the small scale structure of the Universe, reducing the central densities of dwarfs and low surface brightness galaxies in accord with observations. From a particle physics point of view, this points toward the existence of a 1 − 100 MeV particle in the dark sector that mediates self-interactions. Since mediator particles will generically couple to the Standard Model, direct detection experiments provide sensitive probes of self-interacting dark matter. We consider three minimal mechanisms for coupling the dark and visible sectors: photon kinetic mixing, Z boson mass mixing, and the Higgs portal. Self-interacting dark matter motivates a new benchmark paradigm for direct detection via momentum-dependent interactions, and ton-scale experiments will cover astrophysically motivated parameter regimes that are unconstrained by current limits. Direct detection is a complementary avenue to constrain velocity-dependent self-interactions that evade astrophysical bounds from larger scales, such as those from the Bullet Cluster.

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Section: Portals For Light Mediatorsmentioning

confidence: 99%

Direct detection portals for self-interacting dark matter

Kaplinghat

Tulin²,

Yu³

2014

Phys. Rev. D

165

229

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“…Constraints from CMB distortions are largely insensitive to systematic uncertainties [96][97][98][99][100][101][102], and with the latest CMB data from Planck correspond to the limit [89] f eff σv m χ 3 × 10 −28 cm 3 /s/GeV . (5.5)…”

Section: Indirect Detectionmentioning

confidence: 99%

Explaining dark matter and B decay anomalies with an L μ − L τ model

Altmannshofer

Gori

Profumo

et al. 2016

J. High Energ. Phys.

185

118

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We present a dark sector model based on gauging the L µ − L τ symmetry that addresses anomalies in b → sµ + µ − decays and that features a particle dark matter candidate. The dark matter particle candidate is a vector-like Dirac fermion coupled to the Z gauge boson of the L µ − L τ symmetry. We compute the dark matter thermal relic density, its pair-annihilation cross section, and the loop-suppressed dark matter-nucleon scattering cross section, and compare our predictions with current and future experimental results. We demonstrate that after taking into account bounds from B s meson oscillations, dark matter direct detection, and the CMB, the model is highly predictive: B physics anomalies and a viable particle dark matter candidate, with a mass of ∼ (5 − 23) GeV, can be accommodated only in a tightly-constrained region of parameter space, with sharp predictions for future experimental tests. The viable region of parameter space expands if the dark matter is allowed to have L µ − L τ charges that are smaller than those of the SM leptons.

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“…Thermal relic dark matter sets a natural scale for the thermally averaged DM annihilation cross section around σ ann v rel 6 × 10 −26 cm 3 s −1 . This scale can be searched for in CMB [71], gamma-ray [72], and even neutrino data [73]. Both CMB and gamma-ray data have breached thermal relic sensitivity for light DM masses.…”

mentioning

confidence: 99%

Direct Detection Phenomenology in Models Where the Products of Dark Matter Annihilation Interact with Nuclei

2015

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We investigate the direct detection phenomenology of a class of dark matter (DM) models in which DM does not directly interact with nuclei, but rather the products of its annihilation do. When these annihilation products are very light compared to the DM mass, the scattering in direct detection experiments is controlled by relativistic kinematics. This results in a distinctive recoil spectrum, a non-standard and or even absent annual modulation, and the ability to probe DM masses as low as a ∼10 MeV. We use current LUX data to show that experimental sensitivity to thermal relic annihilation cross sections has already been reached in a class of models. Moreover, the compatibility of dark matter direct detection experiments can be compared directly in Emin space without making assumptions about DM astrophysics, mass, or scattering form factors. Lastly, when DM has direct couplings to nuclei, the limit from annihilation to relativistic particles in the Sun can be stronger than that of conventional non-relativistic direct detection by more than three orders of magnitude for masses in a 2-7 GeV window.Introduction -While very little is known about Dark Matter (DM), its cosmological abundance is experimentally quite well-determined: Ω CDM h 2 = 0.1199 ± 0.0027 [1]. An appealing framework for understanding the relic abundance of Dark Matter (DM) is thermal freeze-out [2]. Number-changing interactions in the early universe, XX ↔ (SM)SM keep DM in thermal equilibrium with the SM bath, until the rate of these annihilation processes drops below the rate of Hubble expansion. After this point the abundance of DM is essentially fixed at, Ω CDM h 2 0.12 6 × 10 −26 cm 3 s −1 / σ ann v rel , singling out a characteristic annihilation cross section σ ann v rel for thermally produced DM to yield the observed abundance. This scenario is attractive in that it provides a simple and elegant framework for the relic abundance that can be tested in a variety of ways, including direct detection (DD) [3]. However, current constraints from DD rule out many of the simplest models of thermal relic DM, which may indicate a modification of the above picture.In this paper we investigate a modification of thermal DM which alleviates the tension between DD constraints and the thermal relic hypothesis, while making unique predictions for DD. In particular, we take the abundance of DM, X, to be determined by the annihilation process XX ↔ Y Y , where Y is a much lighter dark sector species. The interactions of the dark sector state Y with ordinary nuclei allows for a unique test of the scenario at DD experiments. The resulting DD phenomenology of this class of models is distinctive, owing to the fact that (1) the scattering partner of the nucleus is relativistic, rendering the kinematics of scattering completely different and (2) it is the flux of the scattering partner Y that determines the rate of events at a detector rather than X. Both of these features have novel consequences not considered in the literature of "model-independent" direct detecti...

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Current dark matter annihilation constraints from CMB and low-redshift data

Cited by 198 publications

References 59 publications

Direct detection portals for self-interacting dark matter

Direct detection portals for self-interacting dark matter

Explaining dark matter and B decay anomalies with an L μ − L τ model

Direct Detection Phenomenology in Models Where the Products of Dark Matter Annihilation Interact with Nuclei

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