A New Target Object for Constraining Annihilating Dark Matter

Chan, Man Ho

doi:10.3847/1538-4357/aa767e

Cited by 12 publications

(11 citation statements)

References 31 publications

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“…If such physical processes really take place, then a large number of positrons and gamma ray photons are produced, thus giving some clear observational signatures for the presence of dark matter. This possibility may be supported by the detection of excess positron emission in our galaxy [41][42][43][44][45][46][47][48]. Hence the excess gamma-ray and positron emissions in our galaxy could be interpreted as coming from the annihilation of dark matter with mass in the range of m ∼ 10 − 100 GeV [41][42][43].…”

Section: Introductionmentioning

confidence: 75%

“…Hence the excess gamma-ray and positron emissions in our galaxy could be interpreted as coming from the annihilation of dark matter with mass in the range of m ∼ 10 − 100 GeV [41][42][43]. For an in depth discussion of this problem, as well as of the alternative possibilities for the interpretation of the observational data see [44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

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Jeans instability and turbulent gravitational collapse of Bose–Einstein condensate dark matter halos

Harkó

2019

Eur. Phys. J. C

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We consider the Jeans instability and the gravitational collapse of the rotating Bose-Einstein Condensate dark matter halos, described by the zero temperature non-relativistic Gross-Pitaevskii equation, with repulsive inter-particle interactions. In the Madelung representation of the wave function, the dynamical evolution of the galactic halos is described by the continuity and the hydrodynamic Euler equations, with the condensed dark matter satisfying a polytropic equation of state with index n = 1. By considering small perturbations of the quantum hydrodynamical equations we obtain the dispersion relation and the Jeans wave number, which includes the effects of the vortices (turbulence), of the quantum pressure and of the quantum potential, respectively. The critical scales above which condensate dark matter collapses (the Jeans radius and mass) are discussed in detail. We also investigate the collapse/expansion of rotating condensed dark matter halos, and we find a family of exact semi-analytical solutions of the hydrodynamic evolution equations, derived by using the method of separation of variables. An approximate first order solution of the fluid flow equations is also obtained. The radial coordinate dependent mass, density and velocity profiles of the collapsing/expanding condensate dark matter halos are obtained by using numerical methods.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Jeans instability and turbulent gravitational collapse of Bose–Einstein condensate dark matter halos

Harkó

2019

Eur. Phys. J. C

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“…For example, earlier studies have examined the radio signals of our galaxy and its satellite galaxies to constrain dark matter [14][15][16][17][18][19][20][21][22][23][24][25][26]. Later, radio signals from other nearby galaxies such as the M31 [27][28][29], M33 [30,31], NGC 1569 [32], and NGC 2976 [33] galaxies were also investigated in constraining dark matter. Besides galactic radio signals, radio signals from galaxy clusters have been investigated [34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Radio Constraints of Dark Matter: A Review and Some Future Perspectives

Chan

2021

Galaxies

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In the past few decades, many studies have analyzed the data of gamma-rays, X-rays, radio waves, electrons, positrons, anti-protons, and neutrinos to search for the signal of dark matter annihilation. In particular, analyzing radio data has been one of the most important and effective ways to constrain dark matter. In this article, we review the physics and the theoretical framework of using radio data to constrain annihilating dark matter. We also review some important radio constraints of annihilating dark matter and discuss the future perspectives of using radio detection to reveal the nature of dark matter.

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“…If such a physical process does indeed occur, then a large number of gamma-ray photons and positrons could be produced. Observationally, some excess positron emission in our galaxy has been detected [32][33][34][35][36][37][38][39]. Therefore, it may be possible that the excess positron and gamma-ray emissions could be explained by the annihilation of dark matter with mass m ∼ 10-100 GeV [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, it may be possible that the excess positron and gamma-ray emissions could be explained by the annihilation of dark matter with mass m ∼ 10-100 GeV [32][33][34]. For a detailed discussion of this problem, as well as of the possibility of alternative interpretations of the observational data see [35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Slowly rotating Bose Einstein condensate galactic dark matter halos, and their rotation curves

et al. 2018

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If dark matter is composed of massive bosons, a Bose-Einstein condensation process must have occurred during the cosmological evolution. Therefore galactic dark matter may be in a form of a condensate, characterized by a strong self-interaction. We consider the effects of rotation on the Bose-Einstein condensate dark matter halos, and we investigate how rotation might influence their astrophysical properties. In order to describe the condensate we use the Gross-Pitaevskii equation, and the Thomas-Fermi approximation, which predicts a polytropic equation of state with polytropic index n = 1. By assuming a rigid body rotation for the halo, with the use of the hydrodynamic representation of the Gross-Pitaevskii equation we obtain the basic equation describing the density distribution of the rotating condensate. We obtain the general solutions for the condensed dark matter density, and we derive the general representations for the mass distribution, boundary (radius), potential energy, velocity dispersion, tangential velocity and for the logarithmic density and velocity slopes, respectively. Explicit expressions for the radius, mass, and tangential velocity are obtained in the first order of approximation, under the assumption of slow rotation. In order to compare our results with the observations we fit the theoretical expressions of the tangential velocity of massive test particles moving in rotata

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A New Target Object for Constraining Annihilating Dark Matter

Cited by 12 publications

References 31 publications

Jeans instability and turbulent gravitational collapse of Bose–Einstein condensate dark matter halos

Jeans instability and turbulent gravitational collapse of Bose–Einstein condensate dark matter halos

Radio Constraints of Dark Matter: A Review and Some Future Perspectives

Slowly rotating Bose Einstein condensate galactic dark matter halos, and their rotation curves

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