A scheme of an intense coherent gamma-ray source based on the spontaneous radiation of positronium atoms in a Bose-Einstein condensate (BEC) due to two-photon collective annihilation decay is ...investigated analytically arising from the second quantized formalism. It is shown that because of the intrinsic instability of annihilation decay of BEC, the spontaneously emitted entangled photon pairs are amplified, leading to an exponential buildup of a macroscopic population into end-fire modes at a certain shape of the elongated condensate. The considered scheme may also be applied to a BEC of atoms or quasiparticles as a laser mechanism with double coherence to create entangled photonic beams with a macroscopic number of photons.
The previous theoretical studies concerning the Russian programs OLIMPIA and "Synthesis of heavy elements" are developing based on original cosmological phenomenon of "gravitons' entanglement", ...revealed in scope of Non-Inflationary Cosmology theory, created by author. The broad review of this theoretical concept together with prediction of "initial cosmic quasiparticles" - mixture of correlated carriers of the fundamental physical fields in their vacuum states - were able to initiate another phenomenon, so called "large-scale entanglement of the prototypes of astroparticles". These phenomena could generate within earliest Universe and be continued even during the formation of galaxies, when the trapped inside the SMBH initial Bose-condensate could become a large-scale coherent state through the induced gravitational collapse, turning further into an effective model of a galactic source of high energies. Such a model is able to verify the theoretical mechanism of the galactic jet.
Nonlinear dynamics of the establishment of electron-hole coherent superposition states in graphene by multiphoton resonant excitation of interband transitions in laser fields is considered. The ...single-particle time-dependent density matrix for such a quantized system is calculated in the multiphoton resonant approximation. The dependence of Rabi oscillations of the Fermi-Dirac sea in graphene on the time, momentum, and photon number at multiphoton laser excitation is analyzed.
We suggest cosmological new scales in the Matter Era which reveal the cosmological mission of the Higgs boson. We argue that a fundamental measure of mass in the Matter Era is connected with the ...Higgs boson mass, which in turn determines fundamental measures of length and time. This new ansatz is able to develop an alternative theory of galaxies, black holes and stars in a broad range of masses, to explain the energetic activities of galaxies, and to illustrate their morphological varieties, to describe the observational data on the correlation between masses of the galactic components, and to demonstrate the prerequisites of the galactic rotation phenomenon.
The high-order wave mixing by two-color multiphoton excitation in nonlinear regime along with the harmonics generation in two-dimensional (2D) nanostructures such as graphene, silicene, germanene, ...and stanene is investigated. We consider the coherent part of the spectra corresponding to high harmonic generation by two-color intense laser pulses. The developed theory of interaction of free carriers with the driving effective field of two-color waves covers the full Brillouin zone of 2D hexagonal nanostructures. We also consider the case when one of the driving waves is in one-photon resonance with the van Hove singularity at the M point of the Brillouin zone. Obtained results show that novel 2D nanostructures can serve as an effective medium for high-order wave mixing and harmonic generation at the two-color multiphoton excitation with strong laser pulses.
Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The ...dependence of the cross section on the azimuthal angles of the target polarization (ϕS) and the produced hadron (ϕ) is found to have a substantial sin(ϕ+ϕS) modulation for the production of π+, π− and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For π0 and K− production the amplitude of this Fourier component is consistent with zero.
The momentum and helicity density distributions of the strange quark sea in the nucleon are obtained in leading order from charged-kaon production in deep-inelastic scattering on the deuteron. The ...distributions are extracted from spin-averaged K± multiplicities, and from K± and inclusive double-spin asymmetries for scattering of polarized positrons by a polarized deuterium target. The shape of the momentum distribution is softer than that of the average of the u¯ and d¯ quarks. In the region of measurement 0.02<x<0.6 and Q2>1.0 GeV2, the helicity distribution is zero within experimental uncertainties.
The objective of the paper is to analyse the effects of flow turbulence and inlet moisture on the process of spontaneous condensation of supercooled steam. Calculations of steady and unsteady ...spontaneously condensing transonic turbulent flows in Laval nozzles are presented. Comparisons of model predictions with experimental data are discussed.
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