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A. A. Belyanin V. V. Kocharovsky VI. V. Kocharovsky 《Radiophysics and Quantum Electronics》1996,41(1):22-27
It is believed that the detection of gamma-ray bursts from evaporating primordial black holes is highly improbable in the
near future since the expected photon flux, consisting mainly of photons with energies ≳ GeV, is too low. Contrary to this
point of view, we show that a large fraction of the black hole power at the final stage of evaporation (the last 103 s) can be liberated as a burst of soft γ-ray emission of duration 10−1–103 s and luminosity 1028–1031 erg/s in the energy range 0.1–1 MeV. According to our calculations of the black hole evaporation rate (within the Standard
Model of elementary particles), when the black hole temperature exceeds approximately 10 GeV, the charged particle outflow
from a black hole forms a well-defined plasma and can be described in the hydrodynamic approximation. In this case more than
half of the rest energy of a black hole can be converted into soft gamma-rays due to the presence of the magnetic field with
energy density comparable to that of charged particles. We consider various mechanisms leading to such transformation and
estimate their efficiency. It is shown that, at least, some of the gamma-ray bursts detected by BATSE can be associated with
evaporating black holes.
Institute of Applied Physics, Russian Academy of Sciences, Nizhny Novgorod, Russia. Translated from Izvestiya Vysshikh Uchebnykh
Zavedenii, Radiofizika, Vol. 41, No. 1, pp. 36–45, January, 1998. 相似文献
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Vitaly Kocharovsky Vladimir Kocharovsky Vladimir Martyanov Sergey Tarasov 《Entropy (Basel, Switzerland)》2021,23(11)
We present a finite-order system of recurrence relations for the permanent of circulant matrices containing a band of k any-value diagonals on top of a uniform matrix (for and 3) and the method for deriving such recurrence relations, which is based on the permanents of the matrices with defects. The proposed system of linear recurrence equations with variable coefficients provides a powerful tool for the analysis of the circulant permanents, their fast, linear-time computing; and finding their asymptotics in a large-matrix-size limit. The latter problem is an open fundamental problem. Its solution would be tremendously important for a unified analysis of a wide range of the nature’s -hard problems, including problems in the physics of many-body systems, critical phenomena, quantum computing, quantum field theory, theory of chaos, fractals, theory of graphs, number theory, combinatorics, cryptography, etc. 相似文献
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Tarasov S. V. Kocharovsky Vl. V. Kocharovsky V. V. 《Radiophysics and Quantum Electronics》2019,62(4):293-310
Radiophysics and Quantum Electronics - A change-over of the quasiparticle wave functions and spectrum under a variation in an interparticle interaction in a Bose-Einstein condensed gas of bosons... 相似文献
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Petr A. Kalinin Vitaly V. Kocharovsky Vladimir V. Kocharovsky 《Solid State Communications》2012,152(12):1008-1011
We consider exciton recombination lasing in heterostructure traps for Bose–Einstein condensation of dipolar excitons. We show that such structures suit well for class D lasers where cavity decay strongly exceeds polarization decay. We evaluate lasing threshold taking into account specific inhomogeneous broadening of the exciton spectral line owing to Bose–Einstein condensation phenomenon under quasi-equilibrium conditions.It is found that narrowing of the exciton momentum distribution just before the condensation onset considerably lowers lasing threshold. At the same time, it is pointed out that a subsequent formation of condensate itself does not help lasing much. We conclude that it is possible to achieve lasing on polariton modes in nowadays experiments aimed on Bose–Einstein condensation of excitons. 相似文献
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Tarasov S. V. Kocharovsky Vl. V. Kocharovsky V. V. 《Radiophysics and Quantum Electronics》2020,63(4):288-297
Radiophysics and Quantum Electronics - We consider the Bose-condensate population statistics for a gas of interacting particles confined into a three-dimensional cubic trap with different boundary... 相似文献
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V. A. Kukushkin V. Ya. Aleshkin A. A. Belyanin A. A. Dubinov V. V. Kocharovsky Vl. V. Kocharovsky M. O. Scully 《Laser Physics》2007,17(5):688-694
It is shown that mid-to far-infrared (IR) and terahertz (THz) pulse generation via difference-frequency mixing in quantum
well (QW) dual-wavelength heterolasers can be rather efficient under the modelocking regime for one or both lasing fields
even at room temperature. In such a device, the long-wavelength field is produced in the process of intracavity difference-frequency
mixing of two optical fields: continuous wave (CW) and pulsed (or both pulsed), due to the resonant intersubband quantum coherence
in QWs, as well as due to the nonresonant second-order semiconductor bulk nonlinearity. The mode-locking regime of the optical
generation allows one to significantly enhance the pulsed driving fields in comparison with those under CW operation and,
therefore, substantially increase the output difference-frequency power. Within a simple model, an explicit formula for the
intensity and shape of the generated IR or THz pulse is derived. It is shown that this method is capable of producing picosecond
pulses at a ∼ 1-GHz repetition rate with a peak power of the order of 1 W and ≲0.2 mW at 10 and 50 μm wavelengths, respectively.
Original Text ? Astro, Ltd., 2007. 相似文献