Novel gamma-ray signatures of PeV-scale dark matter

Blanco, Carlos; Harding, J. Patrick

doi:10.1088/1475-7516/2018/04/060

Cited by 21 publications

(19 citation statements)

References 112 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have explicitly verified that the regions excluded by CMB do not change for smaller v values, and that those excluded by 21cm observations and allowed by unitarity do not change up to v 10 −8 (see section 4.2) 16. Another challenge to test large MDM with gamma ray telescopes is posed by the non-transparency of the Milky Way to photons energies of hundreds of TeV, see e.g [59]. for a recent related study.…”

supporting

confidence: 54%

Homeopathic Dark Matter, or how diluted heavy substances produce high energy cosmic rays

Cirelli

Gouttenoire

Petraki

et al. 2019

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

We point out that current and planned telescopes have the potential of probing annihilating Dark Matter (DM) with a mass of O(100) TeV and beyond. As a target for such searches, we propose models where DM annihilates into lighter mediators, themselves decaying into Standard Model (SM) particles. These models allow to reliably compute the energy spectra of the SM final states, and to naturally evade the unitarity bound on the DM mass. Indeed, long-lived mediators may cause an early matter-dominated phase in the evolution of the Universe and, upon decaying, dilute the density of preexisting relics thus allowing for very large DM masses. We compute this dilution in detail and provide results in a ready-to-use form. Considering for concreteness a model of dark U (1) DM, we then study both dilution and the signals at various high energy telescopes observing γ rays, neutrinos and charged cosmic rays. This study enriches the physics case of these experiments, and opens a new observational window on heavy new physics sectors.

show abstract

supporting

confidence: 54%

Homeopathic Dark Matter, or how diluted heavy substances produce high energy cosmic rays

Cirelli

Gouttenoire

Petraki

et al. 2019

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

show abstract

“…Following the IceCube discovery of cosmic neutrinos up to PeV energies, there has been renewed interest in this possibility [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In particular, the connection between neutrinos and gamma-rays from DM decay has been discussed in further detail [21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: High-energy Neutrinos and Dark Matter Decaymentioning

confidence: 99%

Search for neutrinos from decaying dark matter with IceCube

Aartsen¹,

Ackermann²,

Adams³

et al. 2018

Eur. Phys. J. C

110

120

View full text Add to dashboard Cite

With the observation of high-energy astrophysical neutrinos by the IceCube Neutrino Observatory, interest has risen in models of PeV-mass decaying dark matter particles to explain the observed flux. We present two dedicated experimental analyses to test this hypothesis. One analysis uses 6 years of IceCube data focusing on muon neutrino ‘track’ events from the Northern Hemisphere, while the second analysis uses 2 years of ‘cascade’ events from the full sky. Known background components and the hypothetical flux from unstable dark matter are fitted to the experimental data. Since no significant excess is observed in either analysis, lower limits on the lifetime of dark matter particles are derived: we obtain the strongest constraint to date, excluding lifetimes shorter than at 90% CL for dark matter masses above .

show abstract

“…The spectra shown in Figure 2 include final state radiations like Bremsstrahlung of charged leptons, which are electroweak corrections different from interactions with external fields. We consider contributions from secondary γ-rays produced during propagations of charged leptons to be negligible [122][123][124][125][126]. The treatment of the secondary γ-rays and the spectra in our calculation would be consistent with those available in Ref.…”

Section: Burkert Profile [115]mentioning

confidence: 89%

Dependence of accessible dark matter annihilation cross sections on the density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope Array

2019

View full text Add to dashboard Cite

Dwarf spheroidal galaxies are excellent targets in γ-ray searches for dark matter. We consider dark matter searches in dwarf spheroidal galaxies (dSphs) with the Cherenkov Telescope Array (CTA). The aim of this work is to reveal a quantitative and precise dependence of the accessible dark matter annihilation cross-sections on the dark matter density profiles of dSphs and on the distance to them. In most data analyses, researchers have assumed point-like signals from dSphs because it is difficult to resolve the expected emission profiles with current γ-ray observatories. In future however, CTA will be able to resolve the peak emission profiles in dSphs. We take several variations of the dark matter density profile of Draco dSph as examples and analyze the simulated observations of with CTA. We derive the accessible region of the dark matter annihilation crosssection with each dark matter density profile. The accessible region of the annihilation cross-section can differ by a factor of 10 among plausible profiles. We also examine the dependence on the distance to the target dSphs by assuming the same profiles of dSphs at different distances. Closer targets are better due to the higher J-factor, while their spatial extension significantly degrades our reach to the annihilation cross-section compared to the value expected from a simple distance-scaling of the J-factor. Spatial extension of the source affects the probable parameter region in energy-dependent ways. In some γ-ray energy ranges, this behaviour becomes moderately dependent on the properties of the observation facility.

show abstract

Novel gamma-ray signatures of PeV-scale dark matter

Cited by 21 publications

References 112 publications

Homeopathic Dark Matter, or how diluted heavy substances produce high energy cosmic rays

Homeopathic Dark Matter, or how diluted heavy substances produce high energy cosmic rays

Search for neutrinos from decaying dark matter with IceCube

Dependence of accessible dark matter annihilation cross sections on the density profiles of dwarf spheroidal galaxies with the Cherenkov Telescope Array

Contact Info

Product

Resources

About