Diffuse gamma ray constraints on annihilating or decaying Dark Matter after Fermi

By Marco Cirelli, P. Panci, P. Serpico. 2009

207 citations recorded by the source corpus.

Abstract We consider the diffuse gamma ray data from Fermi first year observations and compare them to the gamma ray fluxes predicted by Dark Matter annihilation or decay (both from prompt emission and from Inverse Compton Scattering), for different observation regions of the sky and a range of Dark Matter masses, annihilation/decay channels and Dark Matter galactic profiles. We find that the data exclude large regions of the Dark Matter parameter space not constrained otherwise and discuss possible directions for future improvements. Also, we further constrain Dark Matter interpretations of the e ± PAMELA / Fermi spectral anomalies, both for the annihilating and the decaying Dark Matter case: under very conservative assumptions, only models producing dominantly μ ± and assuming a cored Dark Matter galactic profile can fit the lepton data with masses around ∼ 2 TeV .

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8989c7f9e3199f61d0c56cdafafa7590237407e8

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

In Nuclear and High Energy Physics

Citations in the corpus

Primordial Black Holes as Dark Matter: Recent Developments (2020, background): “The optical depth τ is the result of processes such as photon-matter pair production, photonphoton scattering and photon-photon pair production [305].”
Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background (2015, background): “[109, 110]), since the DM Galactic component is more isotropic compared to the annihilating DM case.”
WIMP dark matter candidates and searches—current status and future prospects (2017, background): “However, the leptophilic models themselves seem to be in tension with limits from gamma-ray and x-ray backgrounds [390, 391], the optical depth of the Universe [392, 393], as well as from radio data [394] and the observations of the CMB radiation [28].”
Constraining light dark matter with diffuse X-ray and gamma-ray observations (2013, methodology): “The lifetime of Weak-scale DM is constrained from observations with the Fermi Large Area Telescope (Fermi LAT) to τ & 1026 sec [28–32], many orders of magnitude larger than the age of the Universe.”
Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects (2012, background): “physical IGRB together with contributions from galactic DM annihilation [139–144].”
Primordial black holes as dark matter candidates (2021, background): “7 χ M/M is the WIMP annihilation rate around each PBH, and τE is the optical depth at redshift z resulting from (i) photon-matter pair production, (ii) photon-photon scattering, and (iii) photonphoton pair production [249,250].”
Galactic Searches for Dark Matter (2012, methodology): “Using standard models for the Milky Way dark matter distribution and simply ascribing all of the background to other processes, the most conservative constraints on the annihilation cross section at 10 GeV are a few times 10−24 cm3 s−1 (Papucci and Strumia, 2010; Cirelli et al., 2010).”