Search for dark matter annihilation in the Milky Way halo

Chang, Luke L. Y.; Lisanti, Mariangela; Mishra-Sharma, Siddharth

doi:10.1103/physrevd.98.123004

Cited by 51 publications

(60 citation statements)

References 91 publications

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“…This point has been discussed in the literature-for example in Refs. [13,[47][48][49][50][51]. A large focus of this paper is to demonstrate how the NPTF results vary as a function of the ROI.…”

Section: B Fermi Datasetmentioning

confidence: 99%

“…In Ref. [51], the diffuse model was divided into independent spatial regions and each component was given its own nuisance parameter. References [29,64] included a large number of nuisance parameters to allow spatial and spectral modulation of the diffuse emission, using regularization techniques to impose physicality conditions.…”

Section: Harmonic Marginalizationmentioning

confidence: 99%

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Foreground mismodeling and the point source explanation of the Fermi Galactic Center excess

et al. 2020

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Section: B Fermi Datasetmentioning

confidence: 99%

Section: Harmonic Marginalizationmentioning

confidence: 99%

Foreground mismodeling and the point source explanation of the Fermi Galactic Center excess

et al. 2020

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“…Our tests are similar to those carried out in Refs. [45,73]; we have simulated DM injections by taking a random Poisson draw of DM maps generated for a range of DM masses and annihilation cross sections. In particular, we considered self-annihilating DM in thebb channel; DM masses of 10, 25, 100, and 500 GeV; annihilation cross sections in the range ½10 −27 ; 3 × 10 −25 cm 3 =s; and two different DM spatial morphologies (gNFW γ ¼ 1.2 and cored profiles).…”

Section: Appendix E: Dark Matter Injection and Recovery Testsmentioning

confidence: 99%

Strong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Center

et al. 2020

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The extended excess toward the Galactic Center (GC) in gamma rays inferred from Fermi-LAT observations has been interpreted as being due to dark matter (DM) annihilation. Here, we perform new likelihood analyses of the GC and show that, when including templates for the stellar galactic and nuclear bulges, the GC shows no significant detection of a DM annihilation template, even after generous variations in the Galactic diffuse emission models and a wide range of DM halo profiles. We include Galactic diffuse emission models with combinations of three-dimensional inverse Compton maps, variations of interstellar gas maps, and a central source of electrons. For the DM profile, we include both spherical and ellipsoidal DM morphologies and a range of radial profiles from steep cusps to kiloparsec-sized cores, motivated in part by hydrodynamical simulations. Our derived upper limits on the dark matter annihilation flux place strong constraints on DM properties. In the case of the pure b-quark annihilation channel, our limits on the annihilation cross section are more stringent than those from the Milky Way dwarfs up to DM masses of approximately TeV and rule out the thermal relic cross section up to approximately 300 GeV. Better understanding of the DM profile, as well as the Fermi-LAT data at its highest energies, would further improve the sensitivity to DM properties.

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“…[77]), the Milky Way (e.g. [78,79]) and galaxy clusters (e.g. [80]) are often considerably more stringent.…”

Section: Constraints From the Present-day Universe: General Pointsmentioning

confidence: 99%

Enhanced n-body annihilation of dark matter and its indirect signatures

Namjoo

Slatyer

2019

J. High Energ. Phys.

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We examine the possible indirect signatures of dark matter annihilation processes with a non-standard scaling with the dark matter density, and in particular the case where more than two dark matter particles participate in the annihilation process. We point out that such processes can be strongly enhanced at low velocities without violating unitarity, similar to Sommerfeld enhancement in the standard case of two-body annihilation, potentially leading to visible signals in indirect searches. We study in detail the impact of such multibody annihilations on the ionization history of the universe and consequently the cosmic microwave background, and find that unlike in the two-body case, the dominant signal can naturally arise from the end of the cosmic dark ages, after the onset of structure formation. We examine the complementary constraints from the Galactic Center, Galactic halo, and galaxy clusters, and outline the circumstances under which each search would give rise to the strongest constraints. We also show that if there is a population of ultra-compact dense dark matter clumps present in the Milky Way with sufficiently steep density profile, then it might be possible to detect point sources illuminated by multi-body annihilation, even if there is no large low-velocity enhancement. Finally, we provide a case study of a model where 3-body annihilation dominates the freezeout process, and in particular the resonant regime where a large low-velocity enhancement is naturally generated. arXiv:1810.09455v1 [astro-ph.CO] 22 Oct 2018 m 2 Pl ρ r ∼ 1 m 2 Pl g * T 4 , whereρ r = (π 2 /30)g * T 4 is the radiation energy density (g * counts the number of relativistic degrees of freedom as usual), i.e. H ∼ g 1/2 * T 2 /m Pl . Thus the criterion for freezeout becomes (g * )

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Search for dark matter annihilation in the Milky Way halo

Cited by 51 publications

References 91 publications

Foreground mismodeling and the point source explanation of the Fermi Galactic Center excess

Foreground mismodeling and the point source explanation of the Fermi Galactic Center excess

Strong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Center

Enhanced n-body annihilation of dark matter and its indirect signatures

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