DARK MATTER DECAY AND ANNIHILATION IN THE LOCAL UNIVERSE: CLUES FROM
                    <i>FERMI</i>

Cuesta, Antonio J.; Jeltema, T.; Zandanel, F.; Profumo, Stefano; Prada, Francisco; Yepes, Gustavo; Klypin, Anatoly; Hoffman, Yehuda; Gottlöber, Stefan; Primack, Joel R.; Pfrommer, Christoph

doi:10.1088/2041-8205/726/1/l6

Cited by 22 publications

(25 citation statements)

References 44 publications

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“…As first pointed out Refs. [315,566], clustering of the DM at small red shifts results in the enhancement of the DM decay signal in the direction of large mass concentrations, such as galaxy clusters, see also [358,[573][574][575]. Typical overdensity, R, (R ≡ ρ/ρ 0 DM ) of a galaxy cluster is at the level of R ∼ 10 3 , while typical cluster size is about R cl ∼ Mpc.…”

Section: X-ray Signals -Overviewmentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

372

316

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Abstract. We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved -cosmology, astrophysics, nuclear, and particle physics -in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for sterile neutrino Dark Matter, based on challenges and tensions in purely cold Dark Matter scenarios. We then round out the discussion by critically summarizing all known constraints on sterile neutrino Dark Matter arising from astrophysical observations, laboratory experiments, and theoretical considerations. In this context, we provide a balanced discourse on the possibly positive signal from X-ray observations. Another focus of the paper concerns the construction of particle physics models, aiming to explain how sterile neutrinos of keV-scale masses could arise in concrete settings beyond the Standard Model of elementary particle physics. The paper ends with an extensive review of current and future astrophysical and laboratory searches, highlighting new ideas and their experimental challenges, as well as future perspectives for the discovery of sterile neutrinos.

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Section: X-ray Signals -Overviewmentioning

confidence: 99%

A White Paper on keV sterile neutrino Dark Matter

Adhikari

Agostini

et al. 2017

J. Cosmol. Astropart. Phys.

372

316

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“…As already mentioned, about 80% of the cluster mass is in the form of DM, which makes galaxy clusters interesting targets for DM searches (Evans et al 2004;Bergström & Hooper 2006;Pinzke et al 2009;Cuesta et al 2011) despite their large distances compared to other common targets for DM searches, such as dwarf spheroidal galaxies (Strigari et al 2007;Acciari et al 2010;Aliu et al 2009) or the Galactic center (Kosack et al 2004;Aharonian et al 2006Aharonian et al , 2009aAbramowski et al 2011).…”

Section: Introductionmentioning

confidence: 99%

CONSTRAINTS ON COSMIC RAYS, MAGNETIC FIELDS, AND DARK MATTER FROM GAMMA-RAY OBSERVATIONS OF THE COMA CLUSTER OF GALAXIES WITH VERITAS ANDFERMI

Arlen

Aune

Beilicke

et al. 2012

ApJ

Self Cite

102

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Observations of radio halos and relics in galaxy clusters indicate efficient electron acceleration. Protons should likewise be accelerated and, on account of weak energy losses, can accumulate, suggesting that clusters may also be sources of very high energy (VHE; E > 100 GeV) gamma-ray emission. We report here on VHE gamma-ray observations of the Coma galaxy cluster with the VERITAS array of imaging Cerenkov telescopes, with complementing Fermi Large Area Telescope observations at GeV energies. No significant gamma-ray emission from the Coma Cluster was detected. Integral flux upper limits at the 99% confidence level were measured to be on the order of (2-5) × 10 −8 photons m −2 s −1 (VERITAS, >220 GeV) and ∼2 × 10 −6 photons m −2 s −1 (Fermi, 1-3 GeV), respectively. We use the gamma-ray upper limits to constrain cosmic rays (CRs) and magnetic fields in Coma. Using an analytical approach, the CR-to-thermal pressure ratio is constrained to be <16% from VERITAS data and <1.7% from Fermi data (averaged within the virial radius). These upper limits are starting to constrain the CR physics in self-consistent cosmological cluster simulations and cap the maximum CR acceleration efficiency at structure formation shocks to be <50%. Alternatively, this may argue for non-negligible CR transport processes such as CR streaming and diffusion into the outer cluster regions. Assuming that the radio-emitting electrons of the Coma halo result from hadronic CR interactions, the observations imply a lower limit on the central magnetic field in Coma of ∼(2-5.5) μG, depending on the radial magnetic field profile and on the gamma-ray spectral index. Since these values are below those inferred by Faraday rotation measurements in Coma (for most of the parameter space), this renders the hadronic model a very plausible explanation of the Coma radio halo. are dark matter (DM) dominated, the VERITAS upper limits have been used to place constraints on the thermally averaged product of the total self-annihilation cross section and the relative velocity of the DM particles, σ v .

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“…In our work this is taken from the results of Ref. [22], where an N -body simulation with constrained initial condition was used. We will review the most important features of this simulation in the next Section.…”

Section: Gamma-rays From Gravitino Decay In the µνSsmmentioning

confidence: 99%

“…In Ref. [22], a CLUES simulation was used to compute projected Cartesian grid all-sky maps of the DM distribution in the Local Universe. In particular, the Box160CR simulation was used, containing 1024 3 particles in a box with a side of 160 h −1 [22,29].…”

Section: Clues (Constrained Local Universe Simulations) [23]mentioning

confidence: 99%

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CLUES on Fermi-LAT prospects for the extragalactic detection of μνSSM gravitino dark matter

Gomez-Vargas

Fornasa

Zandanel

et al. 2012

J. Cosmol. Astropart. Phys.

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The µνSSM is a supersymmetric model that has been proposed to solve the problems generated by other supersymmetric extensions of the standard model of particle physics. Given that R-parity is broken in the µνSSM, the gravitino is a natural candidate for decaying dark matter since its lifetime becomes much longer than the age of the Universe. In this model, gravitino dark matter could be detectable through the emission of a monochromatic gamma ray in a two-body decay. We study the prospects of the Fermi-LAT telescope to detect such monochromatic lines in 5 years of observations of the most massive nearby extragalactic objects. The dark matter halo around the Virgo galaxy cluster is selected as a reference case, since it is associated to a particularly high signalto-noise ratio and is located in a region scarcely affected by the astrophysical diffuse emission from the galactic plane. The simulation of both signal and background gamma-ray events is carried out with the Fermi Science Tools, and the dark matter distribution around Virgo is taken from a N -body simulation of the nearby extragalactic Universe, with constrained initial conditions provided by the CLUES project. We find that a gravitino with a mass range of 0.6-2 GeV, and with a lifetime range of about 3 × 10 27 -2 × 10 28 s would be detectable by the Fermi-LAT with a signal-to-noise ratio larger than 3. We also obtain that gravitino masses larger than about 4 GeV are already excluded in the µνSSM by Fermi-LAT data of the galactic halo.

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DARK MATTER DECAY AND ANNIHILATION IN THE LOCAL UNIVERSE: CLUES FROM FERMI

Cited by 22 publications

References 44 publications

A White Paper on keV sterile neutrino Dark Matter

A White Paper on keV sterile neutrino Dark Matter

CONSTRAINTS ON COSMIC RAYS, MAGNETIC FIELDS, AND DARK MATTER FROM GAMMA-RAY OBSERVATIONS OF THE COMA CLUSTER OF GALAXIES WITH VERITAS ANDFERMI

CLUES on Fermi-LAT prospects for the extragalactic detection of μνSSM gravitino dark matter

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