Decaying vector dark matter as an explanation for the 3.5 keV line from galaxy clusters

Farzan, Yasaman; Akbarieh, Amin Rezaei

doi:10.1088/1475-7516/2014/11/015

Cited by 29 publications

(15 citation statements)

References 88 publications

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“…Frozen-in dark matter has also been used to explain the disagreement between structure formation in cold dark matter simulations and observations [23]. Dark matter interpretation of a spectral feature at E ≃ 3.55 keV observed in x-ray observations from several dark matter dominated sources [24,25] has been studied in [26][27][28][29][30][31], and the galactic centre gamma ray excess in [32]. In our analysis, we will also comment on the parameter space relevant for the 3.55 keV line within our model.…”

Section: Introductionmentioning

confidence: 99%

Observational constraints on decoupled hidden sectors

et al. 2016

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We consider an extension of the Standard Model with a singlet sector consisting of a real (pseudo)scalar and a Dirac fermion coupled with the Standard Model only via the scalar portal. We assume that the portal coupling is weak enough for the singlet sector not to thermalize with the Standard Model allowing the production of singlet particles via the freeze-in mechanism. If the singlet sector interacts with itself sufficiently strongly, it may thermalize within itself, resulting in dark matter abundance determined by the freeze-out mechanism operating within the singlet sector. We investigate this scenario in detail. In particular, we show that requiring the absence of inflationary isocurvature fluctuations provides lower bounds on the magnitude of the dark sector self-interactions and in parts of the parameter space favors sufficiently large self-couplings, supported also by the features observed in the small-scale structure formation.

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Section: Introductionmentioning

confidence: 99%

Observational constraints on decoupled hidden sectors

et al. 2016

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“…(1.5), is not expected to apply. To understand this in greater detail, note that the lifetime for a decaying DM candidate to be consistent with the observed signal is given by (see for instance [99]),…”

Section: The 35 Kev Linementioning

confidence: 97%

A couplet from flavored dark matter

Agrawal

Chacko

Kılıç

et al. 2015

J. High Energ. Phys.

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We show that a couplet, a pair of closely spaced photon lines, in the X-ray spectrum is a distinctive feature of lepton flavored dark matter models for which the mass spectrum is dictated by Minimal Flavor Violation. In such a scenario, mass splittings between different dark matter flavors are determined by Standard Model Yukawa couplings and can naturally be small, allowing all three flavors to be long-lived and contribute to the observed abundance. Then, in the presence of a tiny source of flavor violation, heavier dark matter flavors can decay via a dipole transition on cosmological timescales, giving rise to three photon lines. Two of these lines are closely spaced, and constitute the couplet. Provided the flavor violation is sufficiently small, the ratios of the line energies are determined in terms of the charged lepton masses, and constitute a prediction of this framework. For dark matter masses of order the weak scale, the couplet lies in the keV-MeV region, with a much weaker line in the eV-keV region. This scenario constitutes a potential explanation for the recent claim of the observation of a 3.5 keV line. The next generation of X-ray telescopes may have the necessary resolution to resolve the double line structure of such a couplet.

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“…Many authors have provided models of this excess by monochromatic gamma rays from DM annihilation or decay; see, for example, Refs. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. If the source of the gamma-ray excess is DM annihilation, the required cross section into two photons is v ¼ 1:27 Â 10 À27 cm 3 =s for an Einasto DM density distribution; this value can change for a different DM profile [2].…”

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confidence: 99%

Internal Bremsstrahlung Signature of Real Scalar Dark Matter and Consistency with Thermal Relic Density

Toma

2013

Phys. Rev. Lett.

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A gamma-ray excess from the Galactic center consistent with line emission around 130 GeV was recently found in the Fermi-LAT data. Although the Fermi-LAT Collaboration has not confirmed its significance, such a signal would be a clear signature of dark matter annihilation. Until now, there have been many attempts to explain the excess by dark matter. However, these efforts tend to give too-small cross sections into photons if consistency with the correct thermal relic density of dark matter is required. In this Letter, we consider a simple Yukawa interaction that can be compatible with both aspects and show which parameters are favored.

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Decaying vector dark matter as an explanation for the 3.5 keV line from galaxy clusters

Cited by 29 publications

References 88 publications

Observational constraints on decoupled hidden sectors

Observational constraints on decoupled hidden sectors

A couplet from flavored dark matter

Internal Bremsstrahlung Signature of Real Scalar Dark Matter and Consistency with Thermal Relic Density

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