Indirect dark matter signatures in the cosmic dark ages. I. Generalizing the bound on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>s</mml:mi></mml:math>-wave dark matter annihilation from Planck results

Slatyer, Tracy R.

doi:10.1103/physrevd.93.023527

Cited by 448 publications

(575 citation statements)

References 56 publications

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“…Pair-annihilation to taus, which also includes hadronic final states, leads to similar results since it has only a slightly lower f eff . Annihilation to four muons (which is relevant in the case of χχ → Z Z → 4µ) has also been shown to correspond to f eff ∼ 0.2 [103], leading therefore to similar conclusions. Annihilations into neutrinos produce negligible effects to the CMB power spectrum.…”

Section: Jhep12(2016)106supporting

confidence: 61%

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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Section: Jhep12(2016)106supporting

confidence: 61%

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

View full text Add to dashboard Cite

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“…We show the current constraints from Planck [30] and the projected reach of CMB Stage-4 experiments [59]. Planck and CMB Stage-4 measurements are also sensitive to the rate of dark matter annihilations into SM particles [30][31][32], this becomes important at larger values of δ, as shown in the right panel of Fig. 5.…”

mentioning

confidence: 96%

“…In order to reproduce the observed abundance, the DM mass is generically much lighter than the weak scale. The DM self-annihilation rate can be arbitrarily small, evading stringent limits from the Cosmic Microwave Background (CMB) [30][31][32]. Although χ constitutes DM, there is also a relic population of ψ that decay to χ at late times.…”

mentioning

confidence: 99%

Fourth Exception in the Calculation of Relic Abundances

2017

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We propose that the dark matter abundance is set by the decoupling of inelastic scattering instead of annihilations. This coscattering mechanism is generically realized if dark matter scatters against states of comparable mass from the thermal bath. Coscattering points to dark matter that is exponentially lighter than the weak scale and has a suppressed annihilation rate, avoiding stringent constraints from indirect detection. Dark matter upscatters into states whose late decays can lead to observable distortions to the blackbody spectrum of the cosmic microwave background.Introduction: Dark Matter (DM) constitutes most of the matter in our Universe, but its origin is unknown. One of the most attractive possibilities is that DM starts in thermal equilibrium in the early Universe, and its abundance is set once its annihilations become slower than the expansion rate. This framework is insensitive to initial conditions and has the further appeal of tying the DM abundance to its (potentially observable) interactions.The most widely considered possibility is that 2-to-2 annihilations to Standard Model (SM) particles set the DM relic density. This is known as the Weakly Interacting Massive Particle (WIMP) paradigm [1-4] and points to DM particles with weak scale masses and crosssections. This theoretical framework has had considerable impact shaping experimental searches for DM.However it has long been appreciated that simple variations to the cosmology of thermal relics can have dramatic consequences. In a seminal paper, Ref.[5] enumerates three "exceptions" to thermal relic cosmology: (1) mutual annihilations of multiple species (coannihilations), (2) annihilations into heaver states (forbidden channels), and (3) annihilations near a pole in the cross section. These exceptions lead to phenomenology that can differ significantly from standard WIMPs (see for example [11][12][13]34]), while sharing their appealing theoretical features.In this letter, we introduce a fourth exception. Like Ref.[5], we assume DM begins in thermal equilibrium, has its number diluted through 2-to-2 annihilations, and has a temperature that tracks the photon temperature (for studies that relax at least one of these assumptions see for example Refs. [14][15][16][17][18][19][20][21][22][23][24][25][26][27]). We consider the presence of two states charged under the symmetry that stabilizes DM: χ and ψ, where m χ < m ψ and χ is DM. We assume that χ annihilations are suppressed, and two processes are active:

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“…In our case χχ → φ(→ γγ)φ(→ γγ). For our s-wave model we use the bounds presented in [4,38,39]. Constraints on late time annihilation are typically much less stringent for p-wave annihilations.…”

Section: Jhep12(2016)039 4 Probing Cannibal Dark Mattermentioning

confidence: 99%

Phases of cannibal dark matter

Farina

Pappadopulo

Ruderman

et al. 2016

J. High Energ. Phys.

103

101

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A hidden sector with a mass gap undergoes an epoch of cannibalism if number changing interactions are active when the temperature drops below the mass of the lightest hidden particle. During cannibalism, the hidden sector temperature decreases only logarithmically with the scale factor. We consider the possibility that dark matter resides in a hidden sector that underwent cannibalism, and has relic density set by the freeze-out of two-to-two annihilations. We identify three novel phases, depending on the behavior of the hidden sector when dark matter freezes out. During the cannibal phase, dark matter annihilations decouple while the hidden sector is cannibalizing. During the chemical phase, only two-to-two interactions are active and the total number of hidden particles is conserved. During the one way phase, the dark matter annihilation products decay out of equilibrium, suppressing the production of dark matter from inverse annihilations. We map out the distinct phenomenology of each phase, which includes a boosted dark matter annihilation rate, new relativistic degrees of freedom, warm dark matter, and observable distortions to the spectrum of the cosmic microwave background.

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Indirect dark matter signatures in the cosmic dark ages. I. Generalizing the bound ons-wave dark matter annihilation from Planck results

Cited by 448 publications

References 56 publications

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

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

Fourth Exception in the Calculation of Relic Abundances

Phases of cannibal dark matter

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