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See detailThe DAMPE excess and gamma-ray constraints
Laletin, Maxim ULiege; Belotsky, Konstantin; Solovyov, Maxim et al

E-print/Working paper (2019)

The direct measurements of the cosmic electron-positron spectrum around 1 TeV made by DAMPE have induced many theoretical speculations about possible excesses in the data above the standard astrophysical ... [more ▼]

The direct measurements of the cosmic electron-positron spectrum around 1 TeV made by DAMPE have induced many theoretical speculations about possible excesses in the data above the standard astrophysical predictions that might have the dark matter (DM) origin. These attempts mainly fall into two categories: i) DM annihilation (or decay) in the Galactic halo producing the broad spectrum excess; ii) DM annihilation in the nearby compact subhalo producing the sharp peak at 1.4 TeV. We investigate the gamma-ray emission accompanying e+e− production in DM annihilation, as well as various theoretical means to suppress the prompt radiation, such as specific interaction vertices or multi-cascade modes, and conclude that these attempts are in tension with various gamma-ray observations. We show that the DM explanations of the broad spectrum excess tend to contradict the diffuse isotropic gamma-ray background (IGRB), measured by Fermi-LAT, while the nearby subhalo scenario is constrained by nonobservation in the surveys, performed by Fermi-LAT, MAGIC and HESS. We also briefly review other types of gamma-ray constraints, which seem to rule out the DM interpretations of the DAMPE broad spectrum excess as well. [less ▲]

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See detailStrongly interacting dark matter and the DAMA signal
Laletin, Maxim ULiege; Cudell, Jean-René ULiege

E-print/Working paper (2019)

We show that models of strongly interacting (SIMP) dark matter built to reproduce the DAMA signal actually cannot account for its time dependence. We discuss the constraints on this type of models coming ... [more ▼]

We show that models of strongly interacting (SIMP) dark matter built to reproduce the DAMA signal actually cannot account for its time dependence. We discuss the constraints on this type of models coming from direct detection experiments and study the propagation of thermalised dark matter particles in the ground for the allowed values of the parameters. We consider a simple 1D diffusion and a more detailed 3D diffusion. In both cases the predicted signal has either the wrong phase of the annual modulation or a much larger amplitude of the diurnal modulation. [less ▲]

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See detailDark matter from CP symmetry of order 4: evolution in the asymmetric regime
Laletin, Maxim ULiege; Ivanov, Igor ULiege

in Journal of Cosmology and Astroparticle Physics (2019)

Multi-Higgs models equipped with global symmetries produce scalar dark matter (DM) candidates stabilized by the unbroken symmetry. It is remarkable that a conserved CP symmetry can also stabilize DM ... [more ▼]

Multi-Higgs models equipped with global symmetries produce scalar dark matter (DM) candidates stabilized by the unbroken symmetry. It is remarkable that a conserved CP symmetry can also stabilize DM candidates, provided it is a CP symmetry of order higher than two. CP4 3HDM, the three-Higgs-doublet model with CP symmetry of order 4, is the simplest example of this kind. It contains two mass-degenerate scalar DM candidates φ and φ¯, each of them being a CP4 eigenstate and, therefore, its own antiparticle. A novel phenomenological feature of this model is the presence of φφ↔φ¯φ¯ conversion process, which conserves CP. It offers a rare example of DM models in which self-interaction in the dark sector can significantly affect cosmological and astrophysical observables. Here, we explore the thermal evolution of these DM species in the asymmetric regime. We assume that a mechanism external to CP4 3HDM produces an initial imbalance of the densities of φ and φ¯. As the Universe cools down, we track the evolution of the asymmetry through different stages, and determine how the final asymmetry depends on the interplay between the conversion and annihilation φφ¯→ SM and on the initial conditions. We begin with the analytic treatment of Boltzmann equations, present a detailed qualitative description of the process, and then corroborate it with numerical results obtained using a dedicated computer code. Finally, we check if the model can produce an observable indirect detection signal. [less ▲]

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See detailMulti-Higgs models with CP-symmetries of increasingly high order
Laletin, Maxim ULiege; Ivanov, Igor ULiege

in Physical Review. D. (2018), 98

When building CP-symmetric models beyond the Standard Model, one can impose CP-symmetry of higher order. This means that one needs to apply the CP-transformation more than two times to get the identity ... [more ▼]

When building CP-symmetric models beyond the Standard Model, one can impose CP-symmetry of higher order. This means that one needs to apply the CP-transformation more than two times to get the identity transformation, but still the model is perfectly CP-conserving. A multi-Higgs-doublet model based on CP-symmetry of order 4, dubbed CP4, was recently proposed and its phenomenology is being explored. Here, we show that the construction does not stop at CP4. We build examples of renormalizable multi-Higgs-doublet potentials which are symmetric under CP8 or CP16, without leading to any accidental symmetry. If the vacuum conserves CP-symmetry of order 2k, then the neutral scalars become CP-eigenstates, which are characterized not by CP-parities but by CP-charges defined modulo 2k. One or more lightest states can be the dark matter candidates, which are protected against decay not by the internal symmetry but by the exotic CP. We briefly discuss their mass spectra and interaction patterns for CP8 and CP16. [less ▲]

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See detailStrongly interacting dark matter doesn't explain the DAMA signal
Laletin, Maxim ULiege

Scientific conference (2017, November 10)

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See detailDark matter
Laletin, Maxim ULiege

Scientific conference (2017, September 15)

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See detailThe dark matter disk: a viable explanation of the cosmic positron excess
Laletin, Maxim ULiege

Poster (2017, June 29)

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See detailCan dark matter annihilations explain the AMS-02 positron data?
Laletin, Maxim ULiege

Conference (2017, March)

We show that no dark matter model with the conventional isotropic density distribution can provide a satisfactory explanation of the cosmic positron excess, while being consistent with Fermi-LAT data on ... [more ▼]

We show that no dark matter model with the conventional isotropic density distribution can provide a satisfactory explanation of the cosmic positron excess, while being consistent with Fermi-LAT data on diffuse gamma-ray background. [less ▲]

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See detailFermi-LAT kills dark matter interpretations of AMS-02 data. Or not?
Belotsky, Konstantin; Budaev, Ruslan; Kirillov, Alexander et al

in Journal of Cosmology and Astroparticle Physics (2017)

A number of papers attempt to explain the positron anomaly in cosmic rays, observed by PAMELA and AMS-02, in terms of dark matter (DM) decays or annihilations. However, the recent progress in cosmic gamma ... [more ▼]

A number of papers attempt to explain the positron anomaly in cosmic rays, observed by PAMELA and AMS-02, in terms of dark matter (DM) decays or annihilations. However, the recent progress in cosmic gamma-ray studies challenges these attempts. Indeed, as we show, any rational DM model explaining the positron anomaly abundantly produces final state radiation and Inverse Compton gamma rays, which inevitably leads to a contradiction with Fermi-LAT isotropic diffuse gamma-ray background measurements. Furthermore, the Fermi-LAT observation of Milky Way dwarf satellites, supposed to be rich in DM, revealed no significant signal in gamma rays. We propose a generic approach in which the major contribution to cosmic rays comes from the dark matter disc and prove that the tension between the DM origin of the positron anomaly and the cosmic gamma-ray observations can be relieved. We consider both a simple model, in which DM decay/annihilate into charged leptons, and a model-independent minimal case of particle production, and we estimate the optimal thickness of DM disk. Possible mechanisms of formation and its properties are briefly discussed. [less ▲]

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See detailEvaluation of the Antiproton Flux from the Antineutrino Electron Scattering
Alekseev, V. V.; Belotsky, K. M.; Bogomolov, Yu V. et al

in Journal of Physics. Conference Series (2016), 675(3), 032004

Recent experiments in high enegry cosmic ray physics, PAMELA and AMS-02, excite a new interest to the mechanisms of generation of galactic antiparticles. In spite of the fact that global picture coincides ... [more ▼]

Recent experiments in high enegry cosmic ray physics, PAMELA and AMS-02, excite a new interest to the mechanisms of generation of galactic antiparticles. In spite of the fact that global picture coincides with the predictions of the standard model, there are some black spots stimulating scientists to involve into research a particularly new physics like dark matter. In the present work, we make an attempt to estimate the impact of standard neutrino processes into the total flux of secondary antiprotons detected by contemporary experiments. [less ▲]

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See detailHigh-energy cosmic antiparticle excess vs. isotropic gamma-ray background problem in decaying dark matter Universe
Alekseev, V. V.; Belotsky, K. M.; Bogomolov, Yu V. et al

in Journal of Physics. Conference Series (2016), 675(1), 012023

We are going to show that any conventional decaying dark matter model, providing an explanation of cosmic antiparticle excess observed by PAMELA and AMS-02, inevitably faces the contradiction with ... [more ▼]

We are going to show that any conventional decaying dark matter model, providing an explanation of cosmic antiparticle excess observed by PAMELA and AMS-02, inevitably faces the contradiction with isotropic diffuse gamma-ray background, measured by FERMI/LAT. [less ▲]

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See detailOn a possible solution to gamma-ray overabundance arising in dark matter explanation of cosmic antiparticle excess
Alekseev, V. V.; Belotsky, K. M.; Bogomolov, Yu V. et al

in Journal of Physics. Conference Series (2016), 675(1), 012026

As we are going to show, some self-interacting dark matter models may provide an intriguing solution to the ”cosmic antiparticle excess vs. isotropic diffuse gamma-ray background” problem (an ... [more ▼]

As we are going to show, some self-interacting dark matter models may provide an intriguing solution to the ”cosmic antiparticle excess vs. isotropic diffuse gamma-ray background” problem (an overproduction of diffuse gamma rays, arising in any reasonable decaying or annihilating dark matter model explaining high-energy charged cosmic antiparticles anomalous abundance). [less ▲]

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See detailA no-go theorem for the dark matter interpretation of the positron anomaly
Laletin, Maxim ULiege

in Frascati Physics Series (2016), LXIII

The overabundance of high-energy cosmic positrons, observed by PAMELA and AMS-02, can be considered as the consequence of dark matter decays or annihilations. We show that recent FERMI/LAT measurements of ... [more ▼]

The overabundance of high-energy cosmic positrons, observed by PAMELA and AMS-02, can be considered as the consequence of dark matter decays or annihilations. We show that recent FERMI/LAT measurements of the isotropic diffuse gamma-ray background impose severe constraints on dark matter explanations and make them practically inconsistent. [less ▲]

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