Results for "P. Wójcik"

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Orbital effect on the in-plane critical field in free-standing superconducting nanofilmsMay 21 2015The superconductor to normal metal phase transition induced by the in-plane magnetic field is studied in free-standing Pb(111) nanofilms. In the considered structures the energy quantization induced by the confinement leads to the thickness-dependent ... More
Fulde-Ferrell state in superconducting core/shell nanowires: role of the orbital effectJul 27 2017The orbital effect on the Fulde-Ferrell (FF) phase is investigated in superconducting core/shell nanowires subjected to the axial magnetic field. The confinement in the radial direction results in the quantization of the electron motion with energies ... More
Durability of the superconducting gap in Majorana nanowires under orbital effects of a magnetic fieldApr 17 2018Jun 23 2018We analyze the superconducting gap in semiconductor/superconductor nanowires under orbital effects of a magnetic field in the weak- and strong-hybridization regimes using an universal procedure that guarantees the stationarity of the system -- vanishing ... More
Probing Andreev reflection reach in semiconductor-superconductor hybrids by Aharonov-Bohm effectSep 28 2018Jan 21 2019Recent development in fabrication of hybrid nanostructures allows for creation of quantum interferometers that combine semiconductor and superconductor materials. We show that in those nanostructures the joint phenomena of Aharonov-Bohm effect and Andreev ... More
Renormalization of the Majorana bound state decay length in a perpendicular magnetic fieldNov 17 2017Jan 12 2018Orbital effects of a magnetic field in a proximitized semiconductor nanowire are studied in the context of the spatial extent of Majorana bound states. We develop analytical model that explains the impact of concurring effects of paramagnetic coupling ... More
Strong spin Seebeck effect in Kondo T-shaped double quantum dotsJun 20 2016We theoretically investigate the thermoelectric and spin thermoelectric properties of a T-shaped double quantum dot strongly coupled to two ferromagnetic leads, focusing on transport regime where the system exhibits the two-stage Kondo effect. We study ... More
Nonlocal Andreev Reflections as a Source of Spin Exchange and Kondo ScreeningSep 17 2018Jan 17 2019We report on a novel exchange mechanism, mediating the Kondo screening, in a correlated double quantum dot structure in the proximity of superconductor, stemming from nonlocal Andreev reflection processes. We estimate its strength perturbatively and corroborate ... More
Interplay of the Kondo effect with the induced pairing in electronic and caloric properties of T-shaped double quantum dotsApr 23 2018Jun 29 2018We examine the influence of the superconducting proximity effect on the transport properties of a T-shaped double quantum dot strongly coupled to two normal, nonmagnetic or ferromagnetic leads. We show that the two-stage Kondo screening may be suppressed ... More
Intersubband pairing induced Fulde-Ferrell phase in metallic nanofilmsApr 12 2019We consider a free-standing metallic nanofilm with a predominant intersubband paring which emerges as a result of the confinement in the growth direction. We show that the Fermi wave vector mismatch between the subbands, detrimental to the intersubband ... More
Superconducting dome in doped 2D superconductors with broken inversion symmetryJul 11 2019We analyze an unconventional inter-subband paired phase in a 2D doped superconductor considering both systems with the inversion symmetry and with the inversion symmetry broken. We find that for a centro-symmetric system the inter-subband pairing can ... More
Tunneling conductance in half-metal/conical magnet/superconductor junctions in the adiabatic and non-adiabatic regime: self-consistent calculationsJul 20 2015The tunneling conductance in the half-metal/conical magnet/superconductor (HM/CM/SC) is investigated by the use of the combined Blonder-Tinkham-Klapwijk (BTK) formalism and the Bogoliubov-de Gennes (BdG) equations. We show that the conductance calculated ... More
Giant superconducting proximity effect on spintronic anisotropyNov 30 2018We investigate theoretically the interplay of proximity effects due to the presence of a superconductor and normal ferromagnetic leads on the formation of the spintronic quadrupolar exchange field in a large-spin molecule. We show that the spintronic ... More
LOSSGRAD: automatic learning rate in gradient descentFeb 20 2019In this paper, we propose a simple, fast and easy to implement algorithm LOSSGRAD (locally optimal step-size in gradient descent), which automatically modifies the step-size in gradient descent during neural networks training. Given a function $f$, a ... More
Spin filter effect at room temperature in GaN/GaMnN ferromagnetic resonant tunneling diodeJan 28 2013We have investigated the spin current polarization without the external magnetic field in the resonant tunneling diode with the emitter and quantum well layers made from the ferromagnetic GaMnN. For this purpose we have applied the self-consistent Wigner-Poisson ... More
All-electrical manipulation of electron spin by the spin-orbit interaction in a semiconductor nanotube: analytical resultsMay 29 2013Dec 05 2013A possibility of controlled manipulation of electron spin states has been investigated for a cylindrical two-dimensional electron gas confined in a semiconductor nanotube/cylindrical nanowire with the Rashba spin-orbit interaction. We present analytical ... More
Spin transistor operation driven by the Rashba spin-orbit coupling in the gated nanowireNov 27 2013The theoretical description has been proposed for the operation of the spin transistor in the gate-controlled InAs nanowire. The calculated current-voltage characteristics show that the current flowing from the source (spin injector) to the drain (spin ... More
Extended Hubbard model with renormalized Wannier wave functions in the correlated state III: Statistically consistent Gutzwiller approximation and the metallization of atomic solid hydrogenFeb 14 2013Jul 03 2014We extend our previous approach (Eur. Phys. J. B, \textbf{74}, 63(2010)) to modeling correlated electronic states and the metal-insulator transition by applying the so-called \emph{statistically consistent Gutzwiller approximation} (SGA) to carry out ... More
Quantifying ContextualitySep 17 2012Apr 11 2013Contextuality is central to both the foundations of quantum theory and to the novel information processing tasks. Although it was recognized before Bell's nonlocality, despite some recent proposals, it still faces a fundamental problem: how to quantify ... More
Antiferromagnetism of almost localized fermions: Evolution from Slater-type to Mott-Hubbard gapJan 21 2003Oct 28 2003We supplement (and critically overview) the existing extensive analysis of antiferromagnetic solution for the Hubbard model with a detailed discussion of two specific features, namely (i) the evolution of the magnetic (Slater) gap (here renormalized by ... More
Exact solution of equations for proton localization in neutron star matterJun 29 2015The rigorous treatment of proton localization phenomenon in asymmetric nuclear matter is presented. The solution of proton wave function and neutron background distribution is found by the use of the extended Thomas-Fermi approach. The minimum of energy ... More
A simple model of spontaneous emissionJan 23 2012Mar 31 2012We present a very simple model of a spontaneous emission from a two-level atom, interacting with a field of a finite number of states. Such a process is often said to occur because of the large number of equally-probable states of environment. We show ... More
Which connected spaces have a quotient homeomorphic to an arcOct 24 2014We announce and examine the conjecture that each infinite connected normal Hausdorff space has a quotient homeomorphic to the unit interval, shown to be true with the additional assumption of compactness or local connectedness. Some connected subsets ... More
Application of a numerical renormalization group procedure to an elementary anharmonic oscillatorOct 05 2012The canonical quantum Hamiltonian eigenvalue problem for an anharmonic oscillator with a Lagrangian L = \dot{\phi}^2/2 - m^2 \phi^2/2 - g m^3 \phi^4 is numerically solved in two ways. One of the ways uses a plain cutoff on the number of basis states and ... More
Notes on scale-invariance and base-invariance for Benford's LawJul 13 2013It is known that if X is uniformly distributed modulo 1 and Y is an arbitrary random variable independent of X then Y+X is also uniformly distributed modulo 1. We prove a converse for any continuous random variable Y (or a reasonable approximation to ... More
Applications of amenable semigroups in operator theoryMay 24 2017The paper deals with continuous homomorphisms $S \ni s \mapsto T_s \in L(E)$ of amenable semigroups $S$ into the algebra $L(E)$ of all bounded linear operators on a Banach space $E$. For a closed linear subspace $F$ of $E$, sufficient conditions are given ... More
How fast increasing powers of a continuous random variable converge to Benford's lawJul 22 2013It is known that increasing powers of a continuous random variable converge in distribution to Benford's law as the exponent approaches infinity. The rate of convergence has been estimated using Fourier analysis, but we present an elementary method, which ... More
Random Projection in Deep Neural NetworksDec 22 2018This work investigates the ways in which deep learning methods can benefit from random projection (RP), a classic linear dimensionality reduction method. We focus on two areas where, as we have found, employing RP techniques can improve deep models: training ... More
Spatiotemporal chaos: the microscopic perspectiveJan 10 2012Extended nonequilibrium systems can be studied in the framework of field theory or from dynamical systems perspective. Here we report numerical evidence that the sum of a well-defined number of instantaneous Lyapunov exponents for the complex Ginzburg-Landau ... More
Influence of the interactions of scalar mesons on the behavior of the symmetry energySep 10 2018Mar 22 2019Symmetry energy behavior of scalar mesons interactions is analyzed within the framework of the standard relativistic mean field model. Whereas the presence of the $\delta$ meson itself makes the symmetry energy stiffer, the crossing term $\delta\textrm{-}\sigma$ ... More
Connected economically metrizable spacesJan 02 2009Nov 07 2009A topological space is nonseparably connected if it is connected but all of its connected separable subspaces are singletons. We show that each connected sequential topological space X is the image of a nonseparably connected complete metric space Eco(X) ... More
Heating of a Quiet Region of the Solar Chromosphere by Ion and Neutral Acoustic WavesJun 04 2019Using high-resolution numerical simulations we investigate the plasma heating driven by periodic two-fluid acoustic waves that originate at the bottom of the photosphere and propagate into the gravitationally stratified and partially ionized solar atmosphere. ... More
Lieb-Wu Solution, Gutzwiller-Wave-Function, and Gutzwiller-Ansatz Approximation, with Adjustable Single-Particle Wave Function for the Hubbard ChainJun 09 2007The optimized single-particle wave functions contained in the parameters of the Hubbard model (t and U) were determined for an infinite atomic chain. In effect, the electronic properties of the chain as a function of interatomic distance R were obtained ... More
Fulde-Ferrell state induced purely by the orbital effect in a superconducting nanowireFeb 17 2015May 11 2015We demonstrate that the Fulde-Ferrell (FF) phase can be induced uniquely by the orbital effect in a cylindrical metallic nanowire. In the external magnetic field the two-fold degeneracy with respect to the orbital quantum number $m$ is lifted what leads ... More
Nonseparably connected complete metric spacesMar 27 2009Nov 05 2009A topological space is nonseparably connected if it is connected but all of its connected separable subspaces are singletons. We show that each connected first countable space is the image of a nonseparably connected complete metric space under a continuous ... More
Approximately angle preserving mappingsNov 10 2017Oct 31 2018In this paper, we present some characterizations of linear mappings, which preserve vectors at a specific angle. We introduce the concept of $(\varepsilon, c)$-angle preserving mappings for $|c|<1$ and $0\leq \varepsilon < 1 + |c|$. In addition, we define ... More
Interactions of benzene, naphthalene, and azulene with alkali-metal and alkaline-earth-metal atoms for ultracold studiesMar 04 2019Jun 26 2019We consider collisional properties of polyatomic aromatic hydrocarbon molecules immersed into ultracold atomic gases and investigate intermolecular interactions of exemplary benzene, naphthalene, and azulene with alkali-metal (Li, Na, K, Rb, Cs) and alkaline-earth-metal ... More
Scalar mesons interactions effects on the symmetry energy behaviorSep 10 2018The symmetry energy behavior is analyzed within the framework of standard Relativistic Mean Field model including the scalar mesons interactions. It is shown that this type of coupling allows the symmetry energy slope to be in agreement with the recent ... More
Extended Hubbard model with renormalized Wannier wave functions in the correlated state: beyond the parametrized modelsJul 15 2008The method used earlier for analysis of correlated nanoscopic systems is extended to infinite (periodic) s-band like systems described by the Hubbard model and its extensions. The optimized single-particle wave functions contained in the parameters of ... More
Interactions of benzene, naphthalene, and azulene with alkali-metal and alkaline-earth-metal atoms for ultracold studiesMar 04 2019We consider collisional studies of polyatomic aromatic hydrocarbon molecules immersed into ultracold atomic gases and investigate intermolecular interactions of exemplary benzene, naphthalene, and azulene with alkali-metal (Li, Na, K, Rb, Cs) and alkaline-earth-metal ... More
Connected, not separably connected complete metric spacesMar 27 2009In a separably connected space any two points are contained in a separable connected subset. We show a mechanism that takes a connected bounded metric space and produces a complete connected metric space whose separablewise components form a quotient ... More
Dimension of interaction dynamicsFeb 17 2000May 22 2000A method allowing to distinguish interacting from non-interacting systems based on available time series is proposed and investigated. Some facts concerning generalized Renyi dimensions that form the basis of our method are proved. We show that one can ... More
Symmetry of Birkhoff-James orthogonality of operators defined between infinite dimensional Banach spacesJul 30 2018We study left symmetric bounded linear operators in the sense of Birkhoff-James orthogonality defined between infinite dimensional Banach spaces. We prove that a bounded linear operator defined between two strictly convex Banach spaces is left symmetric ... More
ZnO, ZnMnO and ZnCoO films grown by atomic layer depositionAug 09 2013Despite many efforts the origin of a ferromagnetic (FM) response in ZnMnO and ZnCoO is still not clear. Magnetic investigations of our samples, not discussed here, show that the room temperature FM response is observed only in alloys with a non-uniform ... More
Critical scaling of the renormalized single-particle wave function near the Mott-Hubbard transitionFeb 25 2009We present a quantum critical behavior of the renormalized single-particle Wannier function, calculated in the Gutzwiller correlated state near the insulator-metal transition (IMT) for cubic lattices. The wave function size and its maximum, as well as ... More
Nonsignaling quantum random access code boxesMar 05 2014Nov 11 2015A well known cryptographic primitive is so called random access code. Namely, Alice is to send to Bob one of two bits, so that Bob has the choice which bit he wants to learn about. However at any time Alice should not learn Bob's choice, and Bob should ... More
One-element Batch Training by Moving WindowMay 30 2019Several deep models, esp. the generative, compare the samples from two distributions (e.g. WAE like AutoEncoder models, set-processing deep networks, etc) in their cost functions. Using all these methods one cannot train the model directly taking small ... More
Creation of superposition of unknown quantum statesMay 19 2015Feb 18 2016The superposition principle is one of the landmarks of quantum mechanics. The importance of quantum superpositions provokes questions about the limitations that quantum mechanics itself imposes on the possibility of their generation. In this work we systematically ... More
Two-fluid numerical simulations of the origin of the fast solar windJun 05 2019Jun 06 2019With the use of our JOANNA code, which solves radiative equations for ion + electron and neutral fluids, we perform realistic 2.5D numerical simulations of plasma outflows associated with the solar granulation. These outflows exhibit physical quantities ... More
Extended Hubbard model with renormalized Wannier wave functions in the correlated state II: Quantum critical scaling of the wave function near the Mott-Hubbard transitionDec 04 2009Dec 09 2009We present a model example of a quantum critical behavior of renormalized single-particle Wannier function composed of Slater s-orbitals and represented in an adjustable Gaussian STO-7G basis, which is calculated for cubic lattices in the Gutzwiller correlated ... More
Two-fluid numerical simulations of the origin of the fast solar windJun 05 2019With the use of our JOANNA code, which solves radiative equations for ion + electron and neutralfluids, we perform realistic 2.5D numerical simulations of plasma outflows associated with the solargranulation. These outflows exhibit physical quantities ... More
Testing Implementation of FAMTAR: Adaptive Multipath RoutingAug 09 2018Mar 02 2019Flow-Aware Multi-Topology Adaptive Routing (FAMTAR) is a new approach to multipath and adaptive routing in IP networks which enables automatic use of alternative paths when the primary one becomes congested. It provides more efficient network resource ... More
One-element Batch Training by Moving WindowMay 30 2019May 31 2019Several deep models, esp. the generative, compare the samples from two distributions (e.g. WAE like AutoEncoder models, set-processing deep networks, etc) in their cost functions. Using all these methods one cannot train the model directly taking small ... More
Transition from positive to negative magnetoresistance induced by a constriction in semiconductor nanowireJul 24 2015Mar 09 2016We have studied the magnetotransport through an indium antimonide (InSb) nanowire grown in [111] direction, with a geometric constriction and in an external magnetic field applied along the nanowire axis. We have found that the magnetoresistance is negative ... More
Symmetry-Breaking Topological Insulators in the $\mathbb{Z}_2$ Bose-Hubbard ModelNov 20 2018Dec 03 2018In this work, we study a one-dimensional model of interacting bosons coupled to a dynamical $\mathbb{Z}_2$ field, the $\mathbb{Z}_2$ Bose-Hubbard model, and analyze the interplay between spontaneous symmetry breaking and topological symmetry protection. ... More
Two-fluid numerical simulations of solar spiculesNov 04 2017We aim to study the formation and evolution of solar spicules by means of numerical simulations of the solar atmosphere. With the use of newly developed JOANNA code, we numerically solve two-fluid (for ions + electrons and neutrals) equations in 2D Cartesian ... More
SuperB Technical Design ReportJun 24 2013In this Technical Design Report (TDR) we describe the SuperB detector that was to be installed on the SuperB e+e- high luminosity collider. The SuperB asymmetric collider, which was to be constructed on the Tor Vergata campus near the INFN Frascati National ... More
A Mock Data Challenge for the Einstein Gravitational-Wave TelescopeJan 17 2012Aug 07 2012Einstein Telescope (ET) is conceived to be a third generation gravitational-wave observatory. Its amplitude sensitivity would be a factor ten better than advanced LIGO and Virgo and it could also extend the low-frequency sensitivity down to 1--3 Hz, compared ... More
Renormalized Energies of Superfluorescent Bursts from an Electron-Hole Magneto-plasma with High Gain in InGaAs Quantum WellsSep 16 2010May 28 2012We study light emission properties of a population-inverted 2D electron-hole plasma in a quantizing magnetic field. We observe a series of superfluorescent bursts, discrete both in time and energy, corresponding to the cooperative recombination of electron-hole ... More
Charge multiplets and masses for E(11)May 28 2008Oct 30 2008The particle, string and membrane charge multiplets are derived in detail from the decomposition of the l1 (charge) representation of E(11) in three, four, five, six, seven and eight spacetime dimensions. A tension formula relating weights of the l1 (charge) ... More
Vacuum energy sequestering and cosmic dynamicsOct 16 2014We explicitly compute the dynamics of closed homogeneous and isotropic universes permeated by a single perfect fluid with a constant equation of state parameter $w$ in the context of a recent reformulation of general relativity, proposed in [1], which ... More
On the cosmological evolution of alpha and mu and the dynamics of dark energyApr 22 2008We study the cosmological evolution of the fine structure constant, $\alpha$, and the proton-to-electron mass ratio, $\mu=m_p/m_e$, in the context of a generic class of models where the gauge kinetic function is a linear function of a quintessence-type ... More
Interacting dark energy: the role of microscopic feedback in the dark sectorFeb 09 2015Mar 10 2015We investigate the impact on the classical dynamics of dark matter particles and dark energy of a non-minimal coupling in the dark sector, assuming that the mass of the dark matter particles is coupled to a dark energy scalar field. We show that standard ... More
In medium T matrix for neutron matterApr 03 2002Jun 18 2002We calculate the equation of state of pure neutron matter, comparing the G-matrix calculation with the in-medium T-matrix result. At low densities, we obtain similar energies per nucleon, however some differences appear at higher densities. We use the ... More
Energy dependence of transverse quark flow in heavy ion collisionsJul 19 2004Energy dependence of quark transverse flow carries information about dynamical properties (equation of state, initial conditions) of deconfined matter produced in heavy ion collisions. We assume quark-antiquark matter formation in Pb+Pb collisions at ... More
D and J/psi production from deconfined matter in relativistic heavy ion collisionsAug 18 2000We study the production of the D and J/psi mesons from deconfined quark matter at CERN SPS energy. Using the MICOR microscopical coalescence model we determine the transverse momentum spectra of these charm mesons. We predict the slopes of their transverse ... More
Molecular Dipolar Crystals as High Fidelity Quantum Memory for Hybrid Quantum ComputingJun 20 2007We study collective excitations of rotational and spin states of an ensemble of polar molecules, which are prepared in a dipolar crystalline phase, as a candidate for a high fidelity quantum memory. While dipolar crystals are formed in the high density ... More
Impact of nuclear effects on the extraction of neutrino oscillation parametersJul 04 2013Dec 03 2013We study the possible impact of nuclear effects and final state interactions on the determination of the oscillation parameters due to mis-reconstruction of non-quasi-elastic events as quasi-elastic events at low energies. We analyze a $\nu_\mu$ disappearance ... More
Non-Perturbative Superpotentials in F-theory and String DualityApr 07 2005May 12 2005We use open-closed string duality between F-theory on K3xK3 and type II strings on CY manifolds without branes to study non-perturbative superpotentials in generalized flux compactifications. On the F-theory side we obtain the full flux potential including ... More
Successive Injection of Opposite Magnetic Helicity in Solar Active Region NOAA 11928Nov 02 2016Understanding the nature and evolution of the photospheric helicity flux transfer is a key to reveal the role of magnetic helicity in coronal dynamics of solar active regions. Using SDO/HMI photospheric vector magnetograms and the derived flow velocity ... More
Multiple partitions, lattice paths and a Burge-Bressoud-type correspondenceAug 31 2006Jan 15 2008A bijection is presented between (1): partitions with conditions $f_j+f_{j+1}\leq k-1$ and $ f_1\leq i-1$, where $f_j$ is the frequency of the part $j$ in the partition, and (2): sets of $k-1$ ordered partitions $(n^{(1)}, n^{(2)}, ..., n^{(k-1)})$ such ... More
Single- and Two-Component GRB Spectra in the Fermi GBM-LAT Energy RangeFeb 13 2012Jun 04 2012Most Fermi GRB spectra appear as either a broken power law extending to GeV energies or as a broken power with a separate GeV power law component. Here we show that such spectra can be understood in terms of magnetically dominated relativistic jets where ... More
The limiting behavior of the Liu-Yau quasi-local energyJun 07 2007The small- and large-sphere limits of the quasi-local energy recently proposed by Liu and Yau are carefully examined. It is shown that in the small-sphere limit, the non-vacuum limit of the Liu-Yau quasi-local energy approaches the expected value \frac{4\pi}{3} ... More
Constraining the physics of the early UniverseMar 26 2019The established cosmological theory which describes the history of the Universe since shortly after the "Big Bang" until today is remarkably successful. Thanks to the increasing precision of available observational data, we are now able to considerably ... More
Investigating a Fluctuating-accretion Model for the Spectral-timing Properties of Accreting Black Hole SystemsDec 15 2005The fluctuating accretion model of Lyubarskii (1997) and its extension by Kotov et al. (2001), seeks to explain the spectral-timing properties of the X-ray variability of accreting black holes in terms of inward-propagating mass accretion fluctuations ... More
Point interaction in dimension two and three as models of small scatterersJul 03 1996In addition to the conventional renormalized--coupling--constant picture, point interactions in dimension two and three are shown to model within a suitable energy range scattering on localized potentials, both attractive and repulsive.
Enhancement of Tc by Sr substitution for Ba in Hg-2212 superconductorApr 16 2003Sep 23 2003The Ba substitution by Sr has been studied in two Hg-2212 series: Hg2(Ba(1-y)Sr(y))2YCu2O8-d and Hg2(Ba(1-y)Sr(y))2(Y0.80Ca0.20)Cu2O8-d. In both series a Tc enhancement of about 40 K is observed when Sr substitutes Ba from y = 0 to y = 1.0. The y = 0 ... More
Characteristic Relations for Quantum MatricesFeb 20 1995Feb 24 1995General algebraic properties of the algebras of vector fields over quantum linear groups $GL_q(N)$ and $SL_q(N)$ are studied. These quantum algebras appears to be quite similar to the classical matrix algebra. In particular, quantum analogues of the characteristic ... More
A new approach to the connection problem for local solutions to the general Heun equationJun 28 2016Jul 03 2016We present new solution of the the connection problem for local solutions to the general Heun equation. Our approach is based on the symmetric form of the Heun's differential equation \cite{Fiziev14,Fiziev16} with four different regular singular points ... More
Inner Structure of Black Holes in Eddington-inspired Born-Infeld gravity: the role of mass inflationNov 10 2015We investigate the interior dynamics of accreting black holes in Eddington-inspired Born-Infeld gravity using the homogeneous approximation and taking charge as a surrogate for angular momentum, showing that accretion can have an enormous impact on their ... More
Primordial black hole constraints on non-gaussian inflation modelsOct 03 2005We determine the abundance of primordial black holes (PBHs) formed in the context of non-gaussian models with primordial density perturbations. We consider models with a renormalized $\chi^2$ probability distribution function parametrized by the number, ... More
Eddington-inspired Born-Infeld gravity: nuclear physics constraints and the validity of the continuous fluid approximationJul 19 2012In this paper we investigate the classical non-relativistic limit of the Eddington-inspired Born-Infeld theory of gravity. We show that strong bounds on the value of the only additional parameter of the theory \kappa, with respect to general relativity, ... More
Thermodynamic consistency for nuclear matter calculationsFeb 10 2001We investigate the relation between the binding energy and the Fermi energy and between different expressions for the pressure in cold nuclear matter. For a self-consistent calculation based on a $\Phi$ derivable $T-$matrix approximation with off-shell ... More
Laser probing of atomic Cooper pairsJan 24 2000We consider a gas of attractively interacting cold Fermionic atoms which are manipulated by laser light. The laser induces a transition from an internal state with large negative scattering length to one with almost no interactions. The process can be ... More
On the electron-energy loss spectra and plasmon resonance in cupratesMar 18 1999The consequences of the non-Drude charge response in the normal state of cuprates and the effect of the layered structure on electron-energy loss spectra are investigated, both for experiments in the transmission and the reflection mode. It is shown that ... More
Phase boundary and finite temperature crossovers of the quantum Ising model in two dimensionsJun 07 2009We revisit the two-dimensional quantum Ising model by computing renormalization group flows close to its quantum critical point. The low but finite temperature regime in the vicinity of the quantum critical point is squashed between two distinct non-Gaussian ... More
The contraction of $SU_μ(2)$ and its differential structures to $E_κ(2)$Jul 02 1998The deformed double covering of E(2) group, denoted by $\tilde{E}_\kappa(2)$, is obtained by contraction from the $SU_\mu(2)$. The contraction procedure is then used for producing a new examples of differential calculi: 3D-left covariant calculus on both ... More
Depurification by Lorentz boostsOct 23 2003We consider a particle of half-integer spin which is nonrelativistic in the rest frame. Assuming the particle is completely polarized along third axis we calculate the Bloch vector as seen by a moving observer. The result for its length is expressed in ... More
Deformed Galilei symmetryNov 24 1998A particular deformation of central extended Galilei group is considered. It is shown that the deformation influences the rules of constructing the composed systems while one particle states remain basically unaffected. In particular the mass appeared ... More
Three-Dimensional Two-Pion Emission Source at SPS: Extraction of Source Breakup Time and Emission DurationJul 30 2008A model-independent, three-dimensional source function for pion pairs has been extracted from Pb+Pb collisions at $\sqrt s_{NN}=17.3$ AGeV. The extracted sourc e exhibits long-range non-Gaussian tails in the directions of the pion-pair net transverse-momentum ... More
Jagged partitions and lattice pathsMay 19 2006A lattice-path description of $K$-restricted jagged partitions is presented. The corresponding lattice paths can have peaks only at even $x$ coordinate and the maximal value of the height cannot be larger than $K-1$. Its weight is twice that of the corresponding ... More
Parafermionic derivation of Andrews-type multiple sumsMay 11 2005A multi-parafermion basis of states for the Z_k parafermionic models is derived. Its generating function is constructed by elementary steps. It corresponds to the Andrews multiple-sum which enumerates partitions whose parts separated by the distance k-1 ... More
Parafermionic character formulaeJun 29 2000We study various aspects of parafermionic theories such as the precise field content, a description of a basis of states (that is, the counting of independent states in a freely generated highest-weight module) and the explicit expression of the parafermionic ... More
New path description for the M(k+1,2k+3) models and the dual Z_k graded parafermionsSep 11 2007May 28 2008We present a new path description for the states of the non-unitary M(k+1,2k+3) models. This description differs from the one induced by the Forrester-Baxter solution, in terms of configuration sums, of their restricted-solid-on-solid model. The proposed ... More
A quasi-particle description of the M(3,p) modelsJun 09 2005Oct 07 2005The M(3,p) minimal models are reconsidered from the point of view of the extended algebra whose generators are the energy-momentum tensor and the primary field \phi_{2,1} of dimension $(p-2)/4$. Within this framework, we provide a quasi-particle description ... More
Pascal's triangle and word bases for blob algebra idealsJun 12 2007We give an elementary proof of isomorphism of the blob (diagram) algebra and the corresponding extended Temperley-Lieb algebra (defined by presentation).
Computing higher rank primitive root densitiesMar 20 2012Dec 29 2013We extend the character sum method for the computation of densities in Artin primitive root problems developed by H. W. Lenstra and the authors to the situation of radical extensions of arbitrary rank. Our algebraic set-up identifies the key parameters ... More
Eddington-inspired Born-Infeld gravity: astrophysical and cosmological constraintsJan 12 2012In this letter we compute stringent astrophysical and cosmological constraints on a recently proposed Eddington-inspired Born-Infeld theory of gravity. We find, using a generalized version of the Zel'dovich approximation, that in this theory a pressureless ... More
Unified approach to growth and aging in biological, technical and biotechnical systemsJul 16 2012Complex systems, in many different scientific sectors, show coarse-grain properties with simple growth laws with respect to fundamental microscopic algorithms. We propose a classification scheme of growth laws which includes human aging, tumor (and/or ... More
Lorentz-Invariant Interpretation of Noncommutative Space-Time - global versionAug 12 2004Aug 24 2004The global version of the quantum symmetry defined by Chaichian et al (hep-th/0408069) is constructed.
Stability of vector bundles from F-theoryApr 15 1999We use a recently proposed formulation of stable holomorphic vector bundles $V$ on elliptically fibered Calabi--Yau n-fold $Z_n$ in terms of toric geometry to describe stability conditions on $V$. Using the toric map $f: W_{n+1} \to (V,Z_n)$ that identifies ... More