Decaying dark matter can explain the e? excesses

@article{Nardi2008DecayingDM,
  title={Decaying dark matter can explain the e? excesses},
  author={Enrico Nardi and Francesco Sannino and Alessandro Strumia},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2008},
  volume={2009},
  pages={043-043}
}
PAMELA and ATIC recently reported excesses in e± cosmic rays. Since the interpretation in terms of DM annihilations was found to be not easily compatible with constraints from photon observations, we consider the DM decay hypothesis and find that it can explain the e± excesses compatibly with all constraints, and can be tested by dedicated HESS observations of the Galactic Ridge. ATIC data indicate a DM mass of about 2 TeV: this mass naturally implies the observed DM abundance relative to… 

Figures from this paper

Dark matter with a late decaying dark partner

We explain the PAMELA positron excess and the PPB-BETS/ATIC e++e? data using a simple two component dark sector model (2CDS). The two particle species in the dark matter sector are assumed to be in

Enhancement of the annihilation of dark matter in a radiative seesaw model

The radiative seesaw model with an inert doublet has been shown to be attractive from a viewpoint of both neutrino masses and cold dark matter. However, if we apply this model to the explanation of

Inert dark matter in type-II seesaw

A bstractWeakly interacting massive particle (WIMP) as a dark matter (DM) candidate is further inspired by recent AMS-02 data, which confirm the excess of positron fraction observed earlier by PAMELA

High-energy neutrino signatures of dark matter

It has been suggested that the excesses of high-energy cosmic ray electrons and positrons seen by PAMELA and the Fermi Gamma Ray Space Telescope are evidence of dark matter annihilation or decay in

Dark matter sees the light

We construct a Dark Matter (DM) annihilation module that can encompass the predictions from a wide array of models built to explain the recently reported PAMELA and ATIC/PPB-BETS excesses. We present

A hadronic explanation of the lepton anomaly

The rise in the positron fraction, observed by PAMELA, Fermi-LAT and most recently by AMS-02, has created a lot of interest, fuelled by speculations about an origin in dark matter annihilation in the

Results from PAMELA, ATIC and FERMI: Pulsars or dark matter?

Abstract.It is well known that dark matter dominates the dynamics of galaxies and clusters of galaxies. Its constituents remain a mystery despite an assiduous search for them over the past three

Decaying WIMP dark matter for AMS-02 cosmic positron excess

For explaining the AMS-02 cosmic positron excess, which was recently reported, we consider a scenario of thermally produced and decaying dark matter (DM) into the standard model (SM) leptons with an

Late decaying 2-component dark matter scenario as an explanation of the AMS-02 positron excess

The long standing anomaly in the positron flux as measured by the PAMELA and AMS-02 experiments could potentially be explained by dark matter (DM) annihilations. This scenario typically requires a
...

References

SHOWING 1-10 OF 82 REFERENCES

Dark Matter through the Axion Portal

Motivated by the galactic positron excess seen by PAMELA and ATIC/PPB-BETS, we propose that dark matter is a TeV-scale particle that annihilates into a pseudoscalar 'axion'. The positron excess and

Decaying Dark Matter and the PAMELA Anomaly

Astrophysical and cosmological observations do not require the dark matter particles to be absolutely stable. If they are indeed unstable, their decay into positrons might occur at a sufficiently

Gamma-ray and radio tests of the e? excess from DM annihilations

PAMELA and ATIC recently reported an excess in e± cosmic rays. We show that if it is due to Dark Matter annihilations, the associated gamma-ray flux and the synchrotron emission produced by e± in the

Cosmic rays from leptonic dark matter

If dark matter possesses a lepton number, it is natural to expect the dark-matter annihilation and/or decay mainly produces the standard model leptons, while negligible amount of the antiproton is

Slightly Non-Minimal Dark Matter in PAMELA and ATIC

We present a simple model in which dark matter couples to the standard model through a light scalar intermediary that is itself unstable. We find this model has several notable features, and allows a

Heavy wino-like neutralino dark matter annihilation into antiparticles

The lightest neutralino is a viable dark matter (DM) candidate. In this paper we study indirect detection of the wino-like neutralino DM using positrons and antiprotons from the annihilation in the

New positron spectral features from supersymmetric dark matter: A way to explain the PAMELA data?

Department of Physics, Stockholm University, AlbaNova University Center, SE - 106 91 Stockholm, Sweden(Dated: August 27, 2008)The space-borne antimatter experiment PAMELA has recently reported a
...