Possible Emission of Cosmic $X$-- and $\gamma$--rays by Unstable Particles at Late Times

Abstract

Not all astrophysical mechanisms of the emission of electromagnetic radiation including $X$-- and $\gamma$-- rays coming from the space are clear. We find that charged unstable particles as well as neutral unstable particles with non--zero magnetic moment which live sufficiently long may emit electromagnetic radiation. This new mechanism is connected with the properties of unstable particles at the post exponential time region. Analyzing the transition time region between exponential and non-exponential form of the survival amplitude it is found that the instantaneous energy of the unstable particle can take very large values, much larger than the energy of this state for times from the exponential time region. Basing on the results obtained for the model considered, it is shown that this purely quantum mechanical effect may be responsible for causing unstable particles to emit electromagnetic--, $X$-- or $\gamma$--rays at some time intervals from the transition time regions.

15 pages, 5 figures

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• Cosmological model with decaying vacuum energy law from principles of quantum mechanics
• Cosmological implications of the transition from the false vacuum to the true vacuum state
• Cosmology with decaying cosmological constant -- exact solutions and model testing
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• Cosmological models with running cosmological term and decaying dark matter
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• The Lee model: a tool to study decays
• Boosting unstable particles
• Transformation of intermediate times in the decays of moving unstable quantum systems via the exponential modes
• On the velocity of moving relativistic unstable quantum systems
• Cosmological "constant" in a universe born in the metastable false vacuum state