Affine gravitational scenario for dark matter decay

Azri, Hemza; Jueid, Adil; Karahan, Canan; Nasri, Salah

doi:10.1103/physrevd.102.084036

Cited by 13 publications

(7 citation statements)

References 18 publications

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“…In this regard, unlike fermions and gauge bosons which to some extent still require efforts to incorporate them in Eddington gravity completely, scalar fields on the other hand are found to be easily placed in metric-free actions, and allow for interesting features when applied to inflation [16,17], gravitational dark matter [18] as well as spontaneous scalarization [19] and other phenomena [20]. These models are still formulated through the strong Eddington's criteria of symmetric connection and Ricci tensor.…”

Section: Preliminary Remarks and Motivationmentioning

confidence: 99%

“…As we have seen above, V (φ) = 0 is a primary requirement for generating the metric in this approach, and in the absence of the scalar fields (the case of free space), this metric will require a nonzero cosmological constant (already supported by observation) which replaces the potential [20]. The idea of decoupling the metric tensor from matter fields through a metric-affine action in which the metric is not dynamical, has been used to construct a metric-free action for dark matter separable from ordinary matter sector [18].…”

Section: B General Nonminimal Coupling Dynamicsmentioning

confidence: 99%

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Dynamical aspects of asymmetric Eddington gravity with scalar fields

Azri,

Nasri

2021

Preprint

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Section: Preliminary Remarks and Motivationmentioning

confidence: 99%

Section: B General Nonminimal Coupling Dynamicsmentioning

confidence: 99%

Dynamical aspects of asymmetric Eddington gravity with scalar fields

Azri,

Nasri

2021

Preprint

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“…Indirect detection experiments such as the Fermi Large Area Telescope (LAT) [3], AMS [4] or IceCube [5] provide one the possible ways to detect WIMPs. Theoretically, WIMPs undergo either annihilation [6,7], co-annihilations [8], or decays [9,10] into a set of SM stable final-state particles such as high energy photons, positrons, neutrinos, or anti-protons. Recently, an excess on the gamma-ray spectra was detected by the Fermi-LAT [11], called the Galactic Center Excess (GCE) which apparently seem to be consistent with predictions from DM annihilation (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Particle spectra from dark matter annihilation: physics modelling and QCD uncertainties

Jueid¹,

Amoroso²,

Caron³

et al. 2021

Proceedings of Tools for High Energy Physics and Cosmology — PoS(TOOLS2020)

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In this talk, we discuss the physics modelling of particle spectra arising from dark matter (DM) annihilation or decay. In the context of the indirect searches of DM, the final-state products will, in general, undergo a set of complicated processes such as resonance decays, QED/QCD radiation, hadronisation and hadron decays. This set of processes lead to stable particles (photons, positrons, anti-protons, and neutrinos among others) which travel for very long distances before reaching the detectors. The modelling of their spectra contains some uncertainties which are often neglected in the relevant analyses. We discuss the sources of these uncertainties and estimate their impact on photon energy spectra for benchmark DM scenarios with m χ ∈ [10, 1000] GeV. Instructions for how to retrieve complete tables from Zenodo are also provided.

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“…In addition, the photon spectra produced by the decay of scalar singlet dark matter with masses less than 1 GeV would show a sharp feature [51]. Still, there is another gravity portal scenario-for example, the affine gravitational scenario for dark matter decay [104]. Specifically, dark matter can couple to the spacetime affine connection through a Z 2 -symmetry breaking term, resulting in dark matter decay.…”

Section: Introductionmentioning

confidence: 99%

Gravity-Higgs portal for dark matter decay

Sun¹

2021

Preprint

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Dark matter can decay via gravity portals and contribute a minor decay (MD) width. This paper proposes that nonminimal coupling between the Higgs field and gravity can lead to additional gravity-Higgs portals for gravitational dark matter to decay and contribute additional decay (AD) width. For scalar dark matter candidates with a mass less than 5 TeV, the decay branching ratios are almost independent of whether dark matter decay through gravity portals or gravity-Higgs portals; therefore, it is almost impossible to distinguish gravity portals from gravity-Higgs portals by observing decay products. For fermionic singlet dark matter candidates, their MD products are diverse, while their AD products are monotonous, only neutrinos and Higgs bosons. As for both dark matter candidates, gravity-Higgs portals prefer to dominate the decay at around several hundred GeV. Besides, for both TeV dark matter candidates, there is still a vast parameter space alive.

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Affine gravitational scenario for dark matter decay

Cited by 13 publications

References 18 publications

Dynamical aspects of asymmetric Eddington gravity with scalar fields

Dynamical aspects of asymmetric Eddington gravity with scalar fields

Particle spectra from dark matter annihilation: physics modelling and QCD uncertainties

Gravity-Higgs portal for dark matter decay

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