Results for "M. E. Biagini"

total 259224took 0.15s
DAFNE Experience with Negative Momentum CompactionJul 05 2006There are several potential advantages for a collider operation with a lattice with negative momentum compaction factor (alfa). Since the lattice of the Frascati e+e- Phi-factory DAFNE is flexible enough to provide collider operation even with alfa < ... More
Magnetic-field-induced Luttinger liquidJun 26 2000Jul 05 2000It is shown that a strong magnetic field applied to a bulk metal induces a Luttinger-liquid phase. This phase is characterized by the zero-bias anomaly in tunneling: the tunneling conductance scales as a power-law of voltage or temperature. The tunneling ... More
Reduced-form framework under model uncertaintyJul 14 2017Mar 19 2018In this paper we introduce a sublinear conditional expectation with respect to a family of possibly nondominated probability measures on a progressively enlarged filtration. In this way, we extend the classic reduced-form setting for credit and insurance ... More
The Robust Merton Problem of an Ambiguity Averse InvestorFeb 10 2015We derive a closed form portfolio optimization rule for an investor who is diffident about mean return and volatility estimates, and has a CRRA utility. The novelty is that confidence is here represented using ellipsoidal uncertainty sets for the drift, ... More
Extended Reduced-Form Framework for Non-Life InsuranceFeb 21 2018Nov 14 2018In this paper we propose a general framework for modeling an insurance claims' information flow in continuous time, by generalizing the reduced-form framework for credit risk and life insurance. In particular, we assume a nontrivial dependence structure ... More
Convex duality and Orlicz spaces in expected utility maximizationNov 24 2017Mar 07 2019In this paper we report further progress towards a complete theory of state-independent expected utility maximization with semimartingale price processes for arbitrary utility function. Without any technical assumptions we establish a surprising Fenchel ... More
Anomalous mesoscopic fluctuations of transport coefficients above the critical temperatureJul 23 1998We show that above the critical temperature of superconductor - metal phase transitions, both the longitudinal and Hall conductivity exhibit strong temperature dependent mesoscopic fluctuations, with amplitudes much larger than the mesoscopic fluctuations ... More
Polynomial Diffusion Models for Life Insurance LiabilitiesFeb 25 2016Sep 23 2016In this paper we study the pricing and hedging problem of a portfolio of life insurance products under the benchmark approach, where the reference market is modelled as driven by a state variable following a polynomial diffusion on a compact state space. ... More
Admissible Strategies in Semimartingale Portfolio SelectionOct 20 2009Dec 11 2010The choice of admissible trading strategies in mathematical modelling of financial markets is a delicate issue, going back to Harrison and Kreps (1979). In the context of optimal portfolio selection with expected utility preferences this question has ... More
The best gain-loss ratio is a poor performance measureSep 28 2012Dec 17 2012The gain-loss ratio is known to enjoy very good properties from a normative point of view. As a confirmation, we show that the best market gain-loss ratio in the presence of a random endowment is an acceptability index and we provide its dual representation ... More
On the super replication price of unbounded claimsMar 24 2005In an incomplete market the price of a claim f in general cannot be uniquely identified by no arbitrage arguments. However, the ``classical'' super replication price is a sensible indicator of the (maximum selling) value of the claim. When f satisfies ... More
A unified framework for utility maximization problems: An Orlicz space approachJun 16 2008We consider a stochastic financial incomplete market where the price processes are described by a vector-valued semimartingale that is possibly nonlocally bounded. We face the classical problem of utility maximization from terminal wealth, with utility ... More
Nucleation of superconducting pairing states at mesoscopic scales at zero temperatureJul 24 1998We find the spin polarized disordered Fermi liquids are unstable to the nucleation of superconducting pairing states at mesoscopic scales even when magnetic fields which polarize the spins are substantially higher than the critical one. We study the probability ... More
Robust Financial BubblesFeb 17 2016We study the concept of financial bubble in a market model endowed with a set of probability measures, typically mutually singular to each other. In this setting we introduce the notions of robust bubble and robust fundamental value in a consistent way ... More
DAFNEMar 01 2004May 25 2004The results of 2002 DAFNE operation for the two experiments KLOE and DEAR are described. During 2003 a long shutdown has been dedicated to the installation of new Interaction Regions (IR) and to hardware modifications and upgrades. In the last section ... More
Parameters for a Super-Flavor-FactoryJun 04 2006A Super Flavor Factory, an asymmetric energy e+e- collider with a luminosity of order 10^36 cm-2s-1, can provide a sensitive probe of new physics in the flavor sector of the Standard Model. The success of the PEP-II and KEKB asymmetric colliders in producing ... More
Positron driven muon source for a muon colliderMay 14 2019The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance ... More
Tau/Charm Factory Accelerator ReportOct 25 2013The present Report concerns the current status of the Italian Tau/Charm accelerator project and in particular discusses the issues related to the lattice design, to the accelerators systems and to the associated conventional facilities. The project aims ... More
Dynamic quasi-concave performance measuresDec 17 2012We define Conditional quasi concave Performance Measures (CPMs), on random variables bounded from below, to accommodate for additional information. Our notion encompasses a wide variety of cases, from conditional expected utility and certainty equivalent ... More
Design considerations for future DAFNE upgradeNov 17 2004The Frascati F-Factory DAFNE has been delivering luminosity to the KLOE, DEAR and FINUDA experiments since year 2000. Since April 2004 the KLOE run has been resumed and recently peak luminosity of 1.0x1032 cm-2s-1 and integrated luminosity of 6.2 pb-1/day ... More
DAFNE operation with the FINUDA experimentAug 16 2004DAFNE operation restarted in September 2003, after a six month shut-down for the installation of FINUDA, a magnetic detector dedicated to the study of hypernuclear physics. FINUDA is the third experiment running on DAFNE and operates while keeping on ... More
Status of the Super-B factory DesignOct 09 2011The SuperB international team continues to optimize the design of an electron-positron collider, which will allow the enhanced study of the origins of flavor physics. The project combines the best features of a linear collider (high single-collision luminosity) ... More
Da$Φ$ne developments for the KLOE-2 experimental runJun 08 2010Recently the peak luminosity achieved on the DA{\Phi}NE collider has been improved by almost a factor three by implementing a novel collision scheme based on large Piwinski angle and Crab-Waist. This encouraging result opened new perspectives for physics ... More
Indifference price with general semimartingalesMay 28 2009For utility functions $u$ finite valued on $\mathbb{R}$, we prove a duality formula for utility maximization with random endowment in general semimartingale incomplete markets. The main novelty of the paper is that possibly non locally bounded semimartingale ... More
Duality and optimality conditions in stochastic optimization and mathematical financeApr 25 2015This article studies convex duality in stochastic optimization over finite discrete-time. The first part of the paper gives general conditions that yield explicit expressions for the dual objective in many applications in operations research and mathematical ... More
Liquidity induced asset bubbles via flows of ELMMsNov 04 2016Nov 24 2016We consider a constructive model for asset price bubbles, where the market price $W$ is endogenously determined by the trading activity on the market and the fundamental price $W^F$ is exogenously given, as in the work of Jarrow, Protter and Roch (2012). ... More
The Long-Term Swap Rate and a General Analysis of Long-Term Interest RatesJul 01 2015Sep 24 2015We introduce here for the first time the long-term swap rate, characterised as the fair rate of an overnight indexed swap with infinitely many exchanges. Furthermore we analyse the relationship between the long-term swap rate, the long-term yield, see ... More
Liquidity induced asset bubbles via flows of ELMMsNov 04 2016We consider a constructive model for asset price bubbles, where the market price $W$ is endogenously determined by the trading activity on the market and the fundamental price $W^F$ is exogenously given, as in the work of Jarrow, Protter and Roch (2012). ... More
Financial asset bubbles in banking networksJun 05 2018We consider a banking network represented by a system of stochastic differential equations coupled by their drift. We assume a core-periphery structure, and that the banks in the core hold a bubbly asset. The banks in the periphery have not direct access ... More
Local Risk-Minimization under the Benchmark ApproachOct 08 2012We study the pricing and hedging of derivatives in incomplete financial markets by considering the local risk-minimization method in the context of the benchmark approach, which will be called benchmarked local risk-minimization. We show that the proposed ... More
The Long-Term Swap Rate and a General Analysis of Long-Term Interest RatesJul 01 2015Oct 16 2016We introduce here for the first time the long-term swap rate, characterised as the fair rate of an overnight indexed swap with infinitely many exchanges. Furthermore we analyse the relationship between the long-term swap rate, the long-term yield, see ... More
Robust Mean-Variance Hedging via G-ExpectationFeb 17 2016Aug 25 2016In this paper we study mean-variance hedging under the G-expectation framework. Our analysis is carried out by exploiting the G-martingale representation theorem and the related probabilistic tools, in a contin- uous financial market with two assets, ... More
Affine HJM Framework on $S_{d}^{+}$ and Long-Term YieldNov 04 2013Aug 21 2015We develop the HJM framework for forward rates driven by affine processes on the state space of symmetric positive matrices. In this setting we find a representation for the long-term yield and investigate the yield's asymptotic behaviour.
Upgrade of the PEP-II Low Beta OpticsJun 29 2000The successful commissioning and operation of the PEP-II asymmetric e+e- collider motivated further studies to increase luminosity. In this paper, we discuss a modification of the PEP-II lattice to reduce the vertical beta function at the Interaction ... More
Positron driven muon source for a muon colliderMay 14 2019May 19 2019The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance ... More
Weak localization effects in granular metalsApr 07 2005Jun 20 2005The weak localization correction to the conductivity of a granular metal is calculated using the diagrammatic technique in the reciprocal grain lattice representation. The properties of this correction are very similar to that one in disordered metal, ... More
SuperB Progress Reports -- AcceleratorSep 30 2010Aug 25 2011This report details the present status of the Accelerator design for the SuperB Project. It is one of four separate progress reports that, taken collectively, describe progress made on the SuperB Project since the publication of the SuperB Conceptual ... More
On Fairness of Systemic Risk MeasuresMar 27 2018Jul 04 2018In our previous paper "A Unified Approach to Systemic Risk Measures via Acceptance Set", we have introduced a general class of systemic risk measures that allow random allocations to individual banks before aggregation of their risks. In the present paper, ... More
On Fairness of Systemic Risk MeasuresMar 27 2018Apr 24 2019In our previous paper, "A Unified Approach to Systemic Risk Measures via Acceptance Set" (\textit{Mathematical Finance, 2018}), we have introduced a general class of systemic risk measures that allow for random allocations to individual banks before aggregation ... More
Robust Fundamental Theorem for Continuous ProcessesOct 18 2014Jul 18 2015We study a continuous-time financial market with continuous price processes under model uncertainty, modeled via a family $\mathcal{P}$ of possible physical measures. A robust notion ${\rm NA}_{1}(\mathcal{P})$ of no-arbitrage of the first kind is introduced; ... More
Unambiguous determination of the g-factor for holes in bismuth at high B/TJun 14 2000Magnetotransport has been investigated in high purity bismuth crystals in static magnetic fields as high as 20 T and temperatures as low as 25 mK. This high B/T ratio permits observation of pronounced Shubnikov-de Haas oscillations over a wide field range ... More
Optimal control with delayed information flow of systems driven by $G$-Brownian motionFeb 13 2014Apr 11 2014In this paper we study strongly robust optimal control problems under volatility uncertainty. In the $G$-framework we adapt the stochastic maximum principle to find necessary and sufficient conditions for the existence of a strongly robust optimal control. ... More
A Unified Approach to Systemic Risk Measures via Acceptance SetsMar 21 2015Apr 24 2015The financial crisis has dramatically demonstrated that the traditional approach to apply univariate monetary risk measures to single institutions does not capture sufficiently the perilous systemic risk that is generated by the interconnectedness of ... More
Proposal for taking data with the KLOE-2 detector at the DA$Φ$NE collider upgraded in energyJul 29 2010This document reviews the physics program of the KLOE-2 detector at DA$\Phi$NE upgraded in energy and provides a simple solution to run the collider above the $\phi$-peak (up to 2, possibly 2.5 GeV). It is shown how a precise measurement of the multihadronic ... More
Superconducting Fluctuation Corrections to the Thermal Current in Granular MetalsMar 09 2005Apr 25 2006The first-order superconducting fluctuation corrections to the thermal conductivity of a granular metal are calculated. A suppression of thermal conductivity proportional to $T_c/(T-T_c)$ is observed in a region not too close to the critical temperature ... More
SuperB: a linear high-luminosity B FactoryDec 23 2005This paper is based on the outcome of the activity that has taken place during the recent workshop on "SuperB in Italy" held in Frascati on November 11-12, 2005. The workshop was opened by a theoretical introduction of Marco Ciuchini and was structured ... More
Examining Tatooine: Atmospheric Models of Neptune-Like Circumbinary PlanetsMay 27 2016Circumbinary planets experience a time varying irradiation pattern as they orbit their two host stars. In this work, we present the first detailed study of the atmospheric effects of this irradiation pattern on known and hypothetical gaseous circumbinary ... More
Monolayer Solid Helium-4 Clusters on GraphiteNov 16 1998In order to resolve the controversy about the low density region of the phase diagram of the 4He monolayer on graphite, we have undertaken a path integral Monte Carlo study of the system. We provide direct evidence that the low density monolayer possesses ... More
A Silver Anniversary Observation of the X-ray Emitting SN1978K in NGC 1313Jul 18 2007We describe the results of a 2003 Chandra ACIS-I observation of SN1978K. The spectrum shows little flux below 0.6 keV, in contrast to the 2002 ACIS-S observation that showed flux to 0.4 keV. Fitting the ACIS-I spectrum alone leads to two solutions depending ... More
QED Electrical Conductivity using the 2PI Effective ActionMay 01 2007In this article we calculate the electrical conductivity in QED using the 2PI effective action. We use a modified version of the usual 2PI effective action which is defined with respect to self-consistent solutions of the 2-point functions. We show that ... More
Leading Order QCD Shear Viscosity from the 3PI Effective ActionJun 05 2009In this article we calculate the leading order shear viscosity in QCD using the resummed 3PI effective action. We work to 3-loop order in the effective action. We show that the integral equations that resum the pinching and collinear contributions are ... More
Leading Order QED Electrical Conductivity from the 3PI Effective ActionSep 05 2007In this article we study the electrical conductivity in QED using the resummed 3PI effective action. We work to 3-loop order in the effective action. We show that the resulting expression for the conductivity is explicitly gauge invariant, and that the ... More
Decoupling of superfluid and normal modes in pulsating neutron starsJul 16 2010Jan 18 2012We show that equations governing pulsations of superfluid neutron stars can be splitted into two sets of weakly coupled equations, one describing the superfluid modes and another one -- the normal modes. The coupling parameter s is small, |s| ~ 0.01-0.05, ... More
The neutrino emission due to plasmon decay and neutrino luminosity of white dwarfsAug 15 2007One of the effective mechanisms of neutrino energy losses in red giants, presupernovae and in the cores of white dwarfs is the emission of neutrino-antineutrino pairs in the process of plasmon decay. In this paper, we numerically calculate the emissivity ... More
On meson resonances and chiral symmetryJul 09 2003Nov 21 2003We study meson resonances with quantum numbers J^P=1^+ in terms of the chiral SU(3) Lagrangian. At leading order a parameter-free prediction is obtained for the scattering of Goldstone bosons off vector mesons with J^P=1^- once we insist on approximate ... More
Baryon resonances from chiral coupled-channel dynamicsJan 25 2005We discuss the formation of s- and d-wave baryon resonances as predicted by the chiral SU(3) symmetry of QCD. Based on the leading order term of the chiral Lagrangian a rich spectrum of molecules is generated, owing to final-state interactions. The spectrum ... More
On charm baryon resonances and chiral symmetryJul 18 2003Sep 16 2003We study heavy-light baryon resonances with quantum numbers J^P=1/2^- in terms of the non-linear chiral SU(3) Lagrangian. Within the chi-BS(3) approach a parameter-free leading order prediction is obtained for the scattering of Goldstone bosons off heavy-light ... More
On heavy-light meson resonances and chiral symmetryJul 09 2003Aug 13 2003We study heavy-light meson resonances with quantum numbers J^P=0^+ and J^P=1^+ in terms of the non-linear chiral SU(3) Lagrangian. At leading order a parameter-free prediction is obtained for the scattering of Goldstone bosons off heavy-light pseudo-scalar ... More
Temperature effects in pulsating superfluid neutron starsMay 20 2011We study the effects of finite stellar temperatures on the oscillations of superfluid neutron stars. The importance of these effects is illustrated with a simple example of a radially pulsating general relativistic star. Two main effects are taken into ... More
Bulk viscosity of superfluid hyperon starsJun 30 2008We calculated bulk viscosity due to non-equilibrium weak processes in superfluid nucleon-hyperon matter of neutron stars. For that, the dissipative relativistic hydrodynamics, formulated in paper [1] for superfluid mixtures, was extended to the case when ... More
Compactness of matrix operators on some sequence spaces derived by Fibonacci numbersAug 31 2013In this paper, we apply the Hausdorff measure of noncompactness to obtain the necessary and sufficient conditions for certain matrix operators on the Fibonacci difference sequence spaces l_{p}(F) and l_{infinite}(F) to be compact, where 1<=p<infinite. ... More
Next-to-Leading Order Transport Coefficients from the Four-Particle Irreducible Effective ActionDec 16 2009Mar 07 2010Transport coefficients can be obtained from 2-point correlators using the Kubo formulae. It has been shown that the full leading order result for electrical conductivity and (QCD) shear viscosity is contained in the re-summed 2-point function that is ... More
Chiral dynamics for exotic open-charm resonancesJun 01 2004We review the open-charm spectrum of chiral excitations in QCD. At leading order in a chiral expansion a parameter-free prediction is obtained for the coupled-channel scattering of Goldstone bosons off open-charm mesons and baryons with 0^-,1^- and {1/2}^+ ... More
Chiral symmetry and resonances in QCDFeb 25 2004We study the formation of resonances in terms of the chiral SU(3) Lagrangian. At leading order parameter-free predictions are obtained for the scattering of Goldstone bosons off any hadron once we insist on approximate crossing symmetry of the unitarized ... More
The $χ$-BS(3) approachOct 18 2001We present the results of the $\chi$-BS(3) approach demonstrating that a combined chiral and 1/N_c expansion of the Bethe-Salpeter interaction kernel leads to a good description of the kaon-nucleon, antikaon-nucleon and pion-nucleon scattering data typically ... More
Velocity-dependent energy gaps and dynamics of superfluid neutron starsJun 28 2012Nov 05 2012We show that suppression of the baryon energy gaps, caused by the relative motion of superfluid and normal liquid components, can substantially influence dynamical properties and evolution of neutron stars. This effect has been previously ignored in the ... 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
New class of g-modes and unexpected convection in neutron starsNov 19 2012We suggest a specific new class of low-frequency g-modes in superfluid neutron stars. We determine the Brunt-Vaisala frequency for these modes and demonstrate that they can be unstable with respect to convection. The criterion for the instability onset ... More
On baryon resonances and chiral symmetryMay 30 2003Jul 23 2003We study J^P=(3/2)^- baryon resonances as generated by chiral coupled-channel dynamics. Parameter free results are obtained in terms of the Weinberg-Tomozawa term predicting the leading s-wave interaction strength of Goldstone bosons with baryon-decuplet ... More
Relativistic chiral SU(3) symmetry, large N_c sum rules and meson-baryon scatteringMay 18 2001The relativistic chiral SU(3) Lagrangian is used to describe kaon-nucleon scattering imposing constraints from the pion-nucleon sector and the axial-vector coupling constants of the baryon octet states. We solve the covariant coupled-channel Bethe-Salpeter ... More
Quantum Spectra of Triangular Billiards on the SphereNov 13 2000We study the quantal energy spectrum of triangular billiards on a spherical surface. Group theory yields analytical results for tiling billiards while the generic case is treated numerically. We find that the statistical properties of the spectra do not ... More
Linear hydrodynamics and viscoelasticity of nematic elastomersJan 04 2001We develop a continuum theory of linear viscoelastic response in oriented monodomain nematic elastomers. The expression for dissipation function is analogous to the Leslie-Ericksen version of anisotropic nematic viscosity; we propose the relations between ... More
The Hypercentral Constituent Quark Model and its symmetryJul 10 2015The hypercentral CQM, which is inspired by Lattice QCD calculations for quark-antiquark potentials, is presented, stressing its underlying symmetry. Its results for the spectrum, the helicity amplitudes and the elastic form factors are briefly reported. ... More
A systematic study of longitudinal and transverse helicity amplidutes in the hypercentral Constituent Quark ModelJun 03 2015We report in a systematic way the predictions of the non-relativistic hypercentral Constituent Quark model for the electromagnetic excitations of baryon resonances. The longitudinal and transverse helicity amplitudes are calculated with no free parameters ... More
On the proton radius problemNov 01 2013The recent values of the proton charge radius obtained by means of muonic-hydrogen laser spectroscopy are about $4\%$ different from the electron scattering data. It has been suggested that the proton radius is actually measured in different frames and ... More
Primordial magnetic fields, anomalous isocurvature fluctuations and Big Bang nucleosynthesisAug 11 1997We show that the presence of primordial stochastic (hypercharge) magnetic fields before the electroweak (EW) phase transition induces isocurvature fluctuations (baryon number inhomogeneities). Depending on the details of the magnetic field spectrum and ... More
Composition temperature-dependent g-modes in superfluid neutron starsApr 27 2014We demonstrate a possibility of existence of a peculiar temperature-dependent composition $g$-modes in superfluid neutron stars. We calculate the Brunt-V$\ddot{\rm a}$is$\ddot{\rm a}$l$\ddot{\rm a}$ frequency for these modes, as well as their eigenfrequencies. ... More
Covariant meson-baryon scattering with chiral and large N_c constraintsMay 28 2001We give a review of recent progress on the application of the relativistic chiral SU(3) Lagrangian to meson-baryon scattering. It is shown that a combined chiral and 1/N_c expansion of the Bethe-Salpeter interaction kernel leads to a good description ... More
Charmed meson resonances from chiral coupled-channel dynamicsNov 17 2003Charmed meson resonances with quantum numbers J^P=0^+ and J^P=1^+ are generated in terms of chiral coupled-channel dynamics. At leading order in the chiral expansion a parameter-free prediction is obtained for the scattering of Goldstone bosons off charmed ... More
Screening in gated bilayer graphene via variational calculusMar 29 2010We analyze the response of bilayer graphene to an external transverse electric field using a variational method. A previous attempt to do so in a recent paper by Falkovsky [Phys. Rev. B 80, 113413 (2009)] is shown to be flawed. Our calculation reaffirms ... More
$Λ(1520)$ at finite densityDec 30 2005We study the decay channels of the $\Lambda(1520)$ in a nuclear medium and find a sizable change - of the order of factor five - of the width of this hyperon at normal nuclear matter density. The mass shift of the $\Lambda(1520)$ is moderate.
Modular operadsAug 17 1994Oct 31 1996Modular operads are a special type of operad: in fact, they bear the same relationship to operads that graphs do to trees (i.e. simply connected graphs). One of the basic examples of a modular operad is the collection of Deligne-Mumford-Knudsen moduli ... More
On the classical dynamics of billiards on the sphereMar 23 1999We study the classical motion in bidimensional polygonal billiards on the sphere. In particular we investigate the dynamics in tiling and generic rational and irrational equilateral triangles. Unlike the plane or the negative curvature cases we obtain ... More
The hypercentral Constituent Quark Model and its application to baryon propertiesJan 15 2015Feb 13 2015The hypercentral Constituent Quark Model (hCQM) for the baryon structure is reviewed and its applications are systematically discussed. The model is based on a simple form of the quark potential, which contains a Coulomb-like interaction and a confinement, ... More
The B_{s0} meson and the B_{s0}B K coupling from QCD sum rulesFeb 26 2010Jul 20 2010We evaluate the mass of the $B_{s0}$ scalar meson and the coupling constant in the $B_{s0} B K$ vertex in the framework of QCD sum rules. We consider the $B_{s0}$ as a tetraquark state to evaluate its mass. We get $m_{B_s0}=(6.04\pm 0.08) \GeV$, which ... More
Meixner class of non-commutative generalized stochastic processes with freely independent values II. The generating functionMar 15 2010Let $T$ be an underlying space with a non-atomic measure $\sigma$ on it. In [{\it Comm.\ Math.\ Phys.}\ {\bf 292} (2009), 99--129] the Meixner class of non-commutative generalized stochastic processes with freely independent values, $\omega=(\omega(t))_{t\in ... More
Improved Fixed Center Approximation of the Faddeev equations for the $\bar{K}NN$ system with S=0Mar 23 2012May 11 2012We extend the Fixed Center Approximation (FCA) to the Faddeev Equations for the $\bar{K} NN$ system with S=0, including the charge exchange mechanisms in the $\bar{K}$ rescattering which have been ignored in former works within the FCA. We obtain similar ... More
Stability of Liquid Crystalline MacroemulsionsSep 18 1995The thermodynamic stability of emulsions of liquid crystal in water (glycerol) matrices is demonstrated for a wide range of materials and concentrations. Coalescence is prevented by an energy barrier for a topological ring defect formation in a neck between ... More
Exotic magnetic orders for high spin ultracold fermionsSep 24 2010Mar 18 2011We study Hubbard models for ultracold bosonic or fermionic atoms loaded into an optical lattice. The atoms carry a high spin $F>1/2$, and interact on site via strong repulsive Van der Waals forces. Making convenient rearrangements of the interaction terms, ... More
Decay of quasiparticles in quantum spin liquidsJan 18 2006Magnetic excitations are studied in gapped quantum spin systems, for which spontaneous two-magnon decays are allowed by symmetry. Interaction between one- and two-particle states acquires nonanalytic frequency and momentum dependence near the boundary ... More
Enhanced magnetocaloric effect in frustrated magnetsOct 13 2002The magnetothermodynamics of strongly frustrated classical Heisenberg antiferromagnets on kagome, garnet, and pyrochlore lattices is examined. The field induced adiabatic temperature change (dT/dH)_S is significantly larger for such systems compared to ... More
Replica symmetry breaking for anisotropic magnets with quenched disorderMar 21 2016Oct 25 2016We study critical behaviour of a magnet with cubic anisotropy and quenched scalar disorder which is taken into account by replica method. We derive to first order in $\epsilon$ approximation the renormalization group equations taking into account possible ... More
Algebraic approach to multiple defects on the line and application to Casimir forceMay 09 2007An algebraic framework for quantization in presence of arbitrary number of point-like defects on the line is developed. We consider a scalar field which interacts with the defects and freely propagates away of them. As an application we compute the Casimir ... More
Comment on "Trouble with the Lorentz Law of Force: Incompatibility with Special Relativity and Momentum Conservation"Jul 19 2012In a recent Letter [arXiv:1205.0096], Mansuripur considers a magnetic dipole positioned at a fixed location from a point charge. Performing a Lorentz transformation to a laboratory frame where the charge distribution moves he finds that `a net torque ... More
Kleinian singularities, derived categories and Hall algebrasDec 02 1998Mar 02 1999We describe the derived category of coherent sheaves on the minimal resolution of the Kleinian singularity associated to a finite subgroup G of SL(2). Then, we give an application to the Euler-characteristic version of the Hall algebra of the category ... More
Development of System Architecture for E-Government Cloud PlatformsMar 21 2016Requirements and criteria for selection of cloud platform and platform visualization are stated by which optimal cloud products will be chosen for the Republic of Kazakhstan e-Government considering quality-price ratio, and also the framework of information ... More
Investigation of magnetic loop structures in the corona of UX ArietisJul 01 2002Most of the emission coming from the solar corona is confined into closed magnetic structures in the form of arcs (loops). Very little is known about the structure of stellar coronae. The magnetic topology, however, can be inferred by studying the radio ... More
Particle in the Electromagnetic Wave with Cylindrical Symmetry, an Analog of the Volkov ProblemNov 30 2011Cylindrically symmetric analogue of the Volkov problem is examined. In presence of the field of a cylindrical electromagnetic wave, classical motion of a non-relativistic particle on a cylindrical surface is described exactly in terms of elliptic functions. ... More
Background field method in the Wilson formulationApr 30 2001A cutoff regularization for a pure Yang-Mills theory is implemented within the background field method keeping explicit the gauge invariance of the effective action. The method has been applied to compute the beta function at one loop order.
Quenched penguins and the Delta I=1/2 ruleFeb 16 2006Jul 05 2006The transformation properties of strong penguin operators under the action of the flavor group change when they are considered as operators in (partially) quenched QCD instead of the unquenched theory. As a result, additional operators and new low-energy ... More