Radiation from matter-antimatter annihilation in the quark nugget model of dark matter

Abstract

We revisit the properties of positron cloud in quark nugget (QN) model of dark matter (DM). In this model, dark matter particles are represented by compact composite objects composed of a large number of quarks or antiquarks with total baryon number $B\sim 10^{24}$. These particles have a very small number density in our galaxy which makes them "dark" to all DM detection experiments and cosmological observations. In this scenario, anti-quark nuggets play special role because they may manifest themselves in annihilation with visible matter. We study electron-positron annihilation in collisions of free electrons, hydrogen and helium gases with the positron cloud of anti-quark nuggets. We show that a strong electric field of anti-quark nuggets destroys positronium, hydrogen and helium atoms and prevents electrons from penetrating deeply in positron cloud, thus reducing the probability of the electron-positron annihilation by nearly five orders of magnitude. Therefore, electron annihilation in the positron cloud of QNs cannot explain the observed by SPI/INTEGRAL detector photons with energy 511 keV in the center of our galaxy. These photons may be explained by a different mechanism in which QN captures protons which annihilate with anti-quarks in the quark core or transform to neutrons thus reducing the QN core charge and increasing QN temperature. As a result QN loses positrons to space which annihilate with electrons there. Even more positrons are produced from charged pions resulting from the proton annihilation. Another manifestation may be emission of photons from ${\pi }^0$ decays.

17 pages, 5 figures; v2: minor corrections, references added

References in corpus (10)

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• Two lectures on color superconductivity
• Cold Dark Matter as Compact Composite Objects
• The Axion Quark Nugget Dark Matter Model: Size Distribution and Survival Pattern
• Physics at CERN's Antiproton Decelerator
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• Axion Quark Nuggets. Dark Matter and Matter-Antimatter asymmetry: theory, observations and future experiments
• Width of the 511 KeV Line from the Bulge of the Galaxy
• Antiproton physics
• AGILE results on relativistic outflows above 100 MeV

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• Radiation from cold molecular clouds and Sun chromosphere produced by anti-quark nugget dark matter
• The Glow of Axion Quark Nugget Dark Matter: (II) Galaxy Clusters
• Possibility of antiquark nuggets detection using meteor searching radars
• Exploring the detection of AQNs in large liquid detectors
• Limits on scalar dark matter interactions with particles other than the photon via loop corrections to the scalar-photon coupling
• A multishell solution in the Skyrme model
• Microscopic composite systems bound by strong gravity in extra dimensions as candidates for dark matter
• A new possible way to detect Axion Anti-quark Nuggets
• B-Spline basis Hartree-Fock method for arbitrary central potentials: atoms, clusters and electron gas
• Many-body theory predictions of positron binding energies in five-membered heterocycles involving N, O, S and NH substituents