Browsing Artykuły naukowe  Articles by Title
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Absorption effects in the blazar’s γray spectra due to luminous stars crossing the jet
(Royal Astronomical Society, 2021)γray emission in active galaxies is likely produced within the inner jet, or in the close vicinity of the supermassive black hole (SMBH) at subparsec distances. γrays have to pass through the surrounding massive stellar ... 
An analysis method for data taken by Imaging Air Cherenkov Telescopes at very high energies under the presence of clouds
(Elsevier, 2020)The effective observation time of Imaging Air Cherenkov Telescopes (IACTs) plays an important role in the detection of γray sources, especially when the expected flux is low. This time is strongly limited by the atmospheric ... 
An Extremum Principle for Smooth Problems
(MDPI, 2020)We derive an extremum principle. It can be treated as an intermediate result between the celebrated smoothconvex extremum principle due to Ioffe and Tikhomirov and the Dubovitskii–Milyutin theorem. The proof of this ... 
Analysis of the mass composition of highenergy cosmic ray
(IOP Publishing, 2013)This paper analyses mass composition of highenergy cosmic ray, comparing simulation and experimental results. Using the nuclear interaction models QGSJETII and Sibyll, we simulate EAS initiated by the primary nuclei ... 
Anti‑algal activity of the 12‑5‑12 gemini surfactant results from its impact on the photosynthetic apparatus
(Springer Nature, 2021)A rapid amplification of algal population has a negative impact on the environment and the global economy. Thus, control of algal proliferation is an important issue and effective procedures which reduce algal blooms and ... 
Artificial Neural Network as a FPGA Trigger for a Detection of NeutrinoInduced Air Showers
(IntechOpen, 2016)Neutrinos play a fundamental role in the understanding of the origin of ultrahighenergy cosmic rays (UHECR). They interact through charged and neutral currents in the atmosphere generating extensive air showers. However, ... 
Chiral fermions, massless particles and Poincare covariance
(Elsevier, 20150519)The coadjoint orbit method is applied to the construction of Hamiltonian dynamics of massless particles of arbitrary helicity. The unusual transformation properties of canonical variables are interpreted in terms of nonlinear ... 
Conformal Newton–Hooke algebras, Niederer's transformation and Pais–Uhlenbeck oscillator
(Elsevier B.V., 2014)Dynamical systems invariant under the action of the lconformal Newton–Hooke algebras are constructed by the method of nonlinear realizations. The relevant first order Lagrangians together with the corresponding Hamiltonians ... 
Conformal Newton–Hooke symmetry of Pais–Uhlenbeck oscillator
(NorthHolland, 2014)It is demonstrated that the Pais–Uhlenbeck oscillator in arbitrary dimension enjoys the l conformal Newton–Hooke symmetry provided frequencies of oscillation form the arithmetic sequence ωk=(2k−1)ω1, where k=1,…,n, and ... 
Constrains for nonstandard statistical models of particle creations by identified hadron multiplicity results at LHC energies
(Springer Berlin Heidelberg, 2014)We analyzed the identified hadron multiplicity predictions of the modified thermodynamical model of the multiparticle production processes with nonextensive statistic. The replacement of the standard Boltzmann exponential ... 
Elastic scattering in geometrical model
(Elsevier B.V., 2016)The experimental data on proton–proton elastic and inelastic scattering emerging from the measurements at the Large Hadron Collider, calls for an efficient model to fit the data. We have examined the optical, geometrical ... 
Electrocaloric effect in cubic Hubbard nanoclusters
(Springer Nature, 2018)In the paper a computational study of the electrocaloric efect is presented for a cubic nanocluster consisting of 8 sites. The system of interest is described by means of an extended Hubbard model in external electric ... 
Erratum: Measurement of D^{∗±} production in deep inelastic scattering at HERA
(Springer Berlin Heidelberg, 2014)In the analysis for our paper on D* production, the beauty contribution was erroneously subtracted twice in the extraction of the reduced cross sections. This affected tables 9 and 10 as well as figures 9 and 10 that ... 
Further studies of the photoproduction of isolated photons with a jet at HERA
(Springer Science+Business Media on behalf of the Scuola Internazionale Superiore di Studi Avanzati, 2014)In this extended analysis using the ZEUS detector at HERA, the photoproduction of isolated photons together with a jet is measured for different ranges of the fractional photon energy, x_γ^{meas}, contributing to the ... 
Generalized Niederer’s transformation for quantum Pais–Uhlenbeck oscillator
(Elsevier B.V., 2015)We extend, to the quantum domain, the results obtained in [Nucl. Phys. B 885 (2014) 150] and [Phys. Lett. B 738 (2014) 405] concerning Niederer’s transformation for the Pais–Uhlenbeck oscillator. Namely, the quantum ... 
Hamiltonian formalisms and symmetries of the Pais–Uhlenbeck oscillator
(Elsevier B.V., 2014)The study of the symmetry of Pais–Uhlenbeck oscillator initiated in Andrzejewski et al. (2014) [24] is continued with special emphasis put on the Hamiltonian formalism. The symmetry generators within the original Pais and ... 
Hidden Lorentz symmetry of the Hořava–Lifshitz gravity
(NorthHolland, 2014)In this Letter it is shown that the Hořava–Lifshitz gravity theory admits Lorentz symmetry preserving preferred global time foliation of the spacetime. 
Induced gravity and gauge interactions revisited
(NorthHolland, 2009)It has been shown that the primary, oldfashioned idea of Sakharov's induced gravity and gauge interactions, in the “oneloop dominance” version, works astonishingly well yielding phenomenologically reasonable results. As ... 
“Isochronic” dynamical systems and nullification of amplitudes
(NorthHolland, 2003)We construct the set of theories which share the property that the treelevel threshold amplitudes nullify even if both initial and final states contain the same type of particles. The origin of this phenomenon lies in ... 
Lorentzcovariant, unitary evolution of a relativistic Majorana qubit
(Springer Nature, 2018)We formulate a covariant description of a relativistic qubit identified with an irreducible set of quantum spin states of a Majorana particle with a sharp momentum. We treat the particle’s fourmomentum as an external ...