Results for "Vincenzo F. Cardone"

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Averaging procedure in variable-G cosmologiesMay 08 2008Oct 20 2008Previous work in the literature had built a formalism for spatially averaged equations for the scale factor, giving rise to an averaged Raychaudhuri equation and averaged Hamiltonian constraint, which involve a backreaction source term. The present paper ... More
Spiral galaxies rotation curves in the Horava - Lifshitz gravity theoryFeb 10 2012We focus on a modified version of Horava - Lifschitz theory and, in particular, we consider the impact of its weak - field static spherically symmetric limit on the galaxy dynamics. In a previous paper, we used the modified gravitational potential obtained ... More
Minkowski Functionals of Convergence Maps and the Lensing Figure of MeritMay 01 2019Minkowski functionals (MFs) quantify the topological properties of a given field probing its departure from Gaussianity. We investigate their use on lensing convergence maps in order to see whether they can provide further insights on the underlying cosmology ... More
Accelerating cosmology in Rastall's theoryJun 22 2009Oct 08 2010In an attempt to look for a viable mechanism leading to a present-day accelerated expansion, we investigate the possibility that the observed cosmic speed up may be recovered in the framework of the Rastall's theory, relying on the non-conservativity ... More
The shadow of light: Lorentz invariance and complementarity principle in anomalous photon behaviourApr 17 2005Apr 21 2005We review the results of two double-slit-like experiments in the infrared range, which evidence an anomalous behaviour of photon systems under particular (energy and space) constraints. These outcomes (independently confirmed by crossing photon beam experiments ... More
Effects of Rayleigh waves on the essential spectrum in perturbed doubly periodic elliptic problemsApr 11 2016Jul 29 2017We give an example of a scalar second order differential operator in the plane with double periodic coefficients and describe its modification, which causes an additional spectral band in the essential spectrum. The modified operator is obtained by applying ... More
A thermodynamic point of view on dark energy modelsDec 06 2016We present a conjugate analysis of two different dark energy models investigating both their agreement with recent data and their thermodynamical properties. The successful match with the data allows to both constrain the model parameters and characterize ... More
Accelerating f(T) gravity models constrained by recent cosmological dataApr 24 2012Generalised Teleparallel gravity, also referred to as f(T) gravity, has been recently proposed as an extended theory of gravitation able to give rise to an accelerated expansion in a matter only universe. The cosmic speed up is driven by an effective ... More
An updated analysis of two classes of f(R) theories of gravityJan 16 2012The observed accelerated cosmic expansion can be a signature of fourth\,-\,order gravity theories, where the acceleration of the Universe is a consequence of departures from Einstein General Relativity, rather than the sign of the existence of a fluid ... More
Cosmological parameters from lenses distance ratioSep 22 2015Strong lensing provides popular techniques to investigate the mass distribution of intermediate redshift galaxies, testing galaxy evolution and formation scenarios. It especially probes the background cosmic expansion, hence constraining cosmological ... More
Constraining f(R) theories with Type Ia Supernovae and Gamma Ray BurstsJul 27 2009Fourth - order gravity theories have received much interest in recent years thanks to their ability to provide an accelerated cosmic expansion in a matter only universe. In these theories, the Lagrangian density of the gravitational field has the form ... More
Testing a Phenomenologically Extended DGP Model with Upcoming Weak Lensing SurveysJan 13 2011A phenomenological extension of the well-known brane-world cosmology of Dvali, Gabadadze and Porrati (eDGP) has recently been proposed. In this model, a cosmological-constant-like term is explicitly present as a non-vanishing tension sigma on the brane, ... More
Constraining massive gravity with recent cosmological dataMay 08 2012A covariant formulation of a theory with a massive graviton and no negative energy state has been recently proposed as an alternative to the usual General Relativity framework. For a spatially flat homogenous and isotropic universe, the theory introduces ... More
Gamma-ray bursts as cosmological probes: LambdaCDM vs. conformal gravityMar 28 2011Oct 11 2011LambdaCDM, for the currently preferred cosmological density Omega_0 and cosmological constant Omega_Lambda, predicts that the Universe expansion decelerates from early times to redshift z~0.9 and accelerates at later times. On the contrary, the cosmological ... More
Hints for families of GRBs improving the Hubble diagramJun 23 2013As soon as their extragalactic origins were established, the hope to make Gamma - Ray Bursts (GRBs) standardizeable candles to probe the very high - z universe has opened the search for scaling relations between redshift independent observable quantities ... More
Tomography from the Next Generation of Cosmic Shear Experiments for Viable f(R) ModelsApr 14 2011Jul 15 2011We present the cosmic shear signal predicted by two viable cosmological models in the framework of modified-action f(R) theories. We use f(R) models where the current accelerated expansion of the Universe is a direct consequence of the modified gravitational ... More
Detectability of Torsion Gravity via Galaxy Clustering and Cosmic Shear MeasurementsNov 05 2013Apr 10 2014Alterations of the gravity Lagrangian introduced in modified torsion gravity theories---also referred to as $f(T)$ gravity---allows for an accelerated expansion in a matter dominated Universe. In this framework, the cosmic speed up is driven by an effective ... More
Color and stellar population gradients in galaxies. Correlation with massApr 27 2010We analyze the color gradients (CGs) of ~50000 nearby SDSS galaxies. From synthetic spectral models based on a simplified star formation recipe, we derive the mean spectral properties, and explain the observed radial trends of the color as gradients of ... More
Halting eternal acceleration with an effective negative cosmological constantMay 09 2008In order to solve the problem of eternal acceleration, a model has been recently proposed including both a negative cosmological constant $\Lambda$ and a scalar field evolving under the action of an exponential potential. We further explore this model ... More
Measurement of the halo bias from stacked shear profiles of galaxy clustersFeb 19 2014We present the observational evidence of the 2-halo term in the stacked shear profile of a sample of about 1200 optically selected galaxy clusters based on imaging data and the public shear catalog from the CFHTLenS. We find that the halo bias, a measure ... More
From 'bathtub' galaxy evolution models to metallicity gradientsMar 12 2019Apr 26 2019We model gas phase metallicity radial profiles of galaxies in the local Universe by building on the `bathtub' chemical evolution formalism - where a galaxy's gas content is determined by the interplay between inflow, star formation and outflows. In particular, ... More
Testing the distance duality relation with present and future dataMay 09 2012The assumptions that "light propagates along null geodesics of the spacetime metric" and "the number of photons is conserved along the light path" lead to the distance duality relation (DDR), $\eta = D_L(z) (1 + z)^{-2}/D_A(z) = 1$, with $D_L(z)$ and ... More
Cosmography of f(R) - brane cosmologyOct 07 2010Cosmography is a useful tool to constrain cosmological models, in particular dark energy models. In the case of modified theories of gravity, where the equations of motion are generally quite complicated, cosmography can contribute to select realistic ... More
Spectrum of a singularly perturbed periodic thin waveguideAug 01 2016We consider a family $\{\Omega^\varepsilon\}_{\varepsilon>0}$ of periodic domains in $\mathbb{R}^2$ with waveguide geometry and analyse spectral properties of the Neumann Laplacian $-\Delta_{\Omega^\varepsilon}$ on $\Omega^\varepsilon$. The waveguide ... More
Bingham flow in porous media with obstacles of different sizeJan 11 2017Mar 05 2017By using the unfolding operators for periodic homogenization, we give a general compactness result for a class of functions defined on bounded domains presenting perforations of two different size. Then we apply this result to the homogenization of the ... More
Example of periodic Neumann waveguide with gap in spectrumMay 25 2016In this note we investigate spectral properties of a periodic waveguide $\Omega^\varepsilon$ ($\varepsilon$ is a small parameter) obtained from a straight strip by attaching an array of $\varepsilon$-periodically distributed identical protuberances having ... More
No need for dark matter in galaxy clusters within Galileon theoryJul 09 2016Modified gravity theories with a screening mechanism have acquired much interest recently in the quest for a viable alternative to General Relativity on cosmological scales, given their intrinsic property of being able to pass Solar System scale tests ... More
Sequential nonideal measurements of quantum oscillators: Statistical characterization with and without environmental couplingNov 12 2015A one-dimensional quantum oscillator is monitored by taking repeated position measurements. As a first con- tribution, it is shown that, under a quantum nondemolition measurement scheme applied to a system initially at the ground state, (i) the observed ... More
Increasing the Lensing Figure of Merit through Higher Order Convergence MomentsFeb 08 2018The unprecedented quality, the increased dataset, and the wide area of ongoing and near future weak lensing surveys allows to move beyond the standard two points statistics thus making worthwhile to investigate higher order probes. As an interesting step ... More
Improving lensing cluster mass estimate with flexionJul 20 2016Gravitational lensing has long been considered as a valuable tool to determine the total mass of galaxy clusters. The shear profile as inferred from the statistics of ellipticity of background galaxies allows to probe the cluster intermediate and outer ... More
Radiative Corrections in K, D, and B decaysJun 01 2006In this talk I review recent developments in the calculation of radiative corrections to $K, D, B$ meson decays and discuss their impact on precision phenomenology.
Non perturbative renormalization group potentials and quintessenceFeb 01 2000Feb 02 2000New solutions to the non perturbative renormalization group equation for the effective action of a scalar field theory in the Local Potential Approximation having the exponential form $e^{\pm\phi}$ are found. This result could be relevant for those quintessence ... More
RG generated fermion massJan 15 2001Chiral symmetry breaking in a purely fermionic theory is investigated by the help of the renormalization group method. The RG equation for the running mass $m_k$ admits a solution with vanishing bare mass and finite physical mass. The running Fermi coupling ... More
Calibration of colour gradient bias in shear measurement using HST/CANDELS dataAug 21 2017Apr 19 2018Accurate shape measurements are essential to infer cosmological parameters from large area weak gravitational lensing studies. The compact diffraction-limited point-spread function (PSF) in space-based observations is greatly beneficial, but its chromaticity ... More
On the linear equation method for the subduction problem in symmetric groupsDec 06 2005Sep 21 2006We focus on the tranformation matrices between the standard Young-Yamanouchi basis of an irreducible representation for the symmetric group S_n and the split basis adapted to the direct product subgroups S_{n_1} \times S_{n-n_1} . We introduce the concept ... More
On the $E$-polynomial of parabolic $\mathrm{Sp}_{2n}$-character varietiesAug 01 2017Dec 29 2017We find the $E$-polynomials of a family of parabolic $\mathrm{Sp}_{2n}$-character varieties $\mathcal{M}^{\xi}_{n}$ of Riemann surfaces by constructing a stratification, proving that each stratum has polynomial count, applying a result of Katz regarding ... More
W_k structure of generalized Frenkel-Kac construction for SU(2)-level k Kac-Moody algebraFeb 19 1997W_k structure underlying the tensverse realization of SU(2) at level k is analyzed. Extension of the equivalence existing between covariant and light-cone gauge realization of affine Kac-Moody algebra to W_k algebras is given. Higher spin generators related ... More
Combinatorics of transformations from standard to non-standard bases in Brauer algebrasOct 26 2006Transformation coefficients between standard bases for irreducible representations of the Brauer centralizer algebra $\mathfrak{B}_f(x)$ and split bases adapted to the $\mathfrak{B}_{f_1} (x) \times \mathfrak{B}_{f_2} (x) \subset \mathfrak{B}_f (x)$ subalgebra ... More
Characterization of Ulrich bundles on Hirzebruch surfacesJun 27 2018In this work we characterize Ulrich bundles of any rank on polarized rational ruled surfaces over $\mathbb{P}^1$. We show that every Ulrich bundle admits a resolution in terms of line bundles. Conversely, given an injective map between suitable totally ... More
On Secure Capacity of Multiple Unicast Traffic over Two-Layer NetworksJan 10 2019This paper studies the problem of secure communication over two-layer networks, where a source is connected to a set of relays via direct edges. These relays are then connected to $m$ destinations, such that each destination has direct connections to ... More
Laser from a Manybody Correlated MediumDec 07 2015Mar 11 2016We consider a non-equilibrium system of interacting emitters described by the XXZ model, whose excitonic transitions are spatially and spectrally coupled to a single mode cavity. We demonstrate that the output radiation field is sensitive to an interplay ... More
A revised model of fluid transport optimization in Physarum polycephalumJun 14 2016Optimization of fluid transport in the slime mold Physarum polycephalum has been the subject of several modeling efforts in recent literature. Existing models assume that the tube adaptation mechanism in P. polycephalum's tubular network is controlled ... More
The spectrum, radiation conditions and the Fredholm property for the Dirichlet Laplacian in a perforated plane with semi-infinite inclusionsApr 19 2017We consider the spectral Dirichlet problem for the Laplace operator in the plane $\Omega^{\circ}$ with double-periodic perforation but also in the domain $\Omega^{\bullet}$ with a semi-infinite foreign inclusion so that the Floquet-Bloch technique and ... More
Quantum CavitationJun 05 2010We consider the theoretical setting of a superfluid like 3He in a rotating container, which is set between the two layers of a type-II superconductor. We describe the superfluid vortices as a 2-dimensional Ising-like model on a triangular lattice in presence ... More
Spectra of open waveguides in periodic mediaSep 04 2015We study the essential spectra of formally self-adjoint elliptic systems on doubly periodic planar domains perturbed by a semi-infinite periodic row of foreign inclusions. We show that the essential spectrum of the problem consists of the essential spectrum ... More
Embedded eigenvalues of the Neumann problem in a strip with a box-shaped perturbationDec 21 2015We consider the spectral Neumann problem for the Laplace operator in an acoustic waveguide $\Pi_{l}^{\varepsilon}$ obtained from a straight unit strip by a low box-shaped perturbation of size $2l\times\varepsilon,$ where $\varepsilon>0$ is a small parameter. ... More
A gap in the continuous spectrum of a cylindrical waveguide with a periodic perturbation of the surfaceOct 29 2009It is proved that small periodic singular perturbation of a cylindrical waveguide surface may open a gap in the continuous spectrum of the Dirichlet problem for the Laplace operator. If the perturbation period is long and the caverns in the cylinder are ... More
Slope evolution of GRB correlations and cosmologyAug 08 2013Gamma -ray bursts (GRBs) observed up to redshifts $z>9.4$ can be used as possible probes to test cosmological models. Here we show how changes of the slope of the {\it luminosity $L^*_X$ -break time $T^*_a$} correlation in GRB afterglows, hereafter the ... More
Pixel lensing observations towards globular clustersApr 15 2003It has been suggested that a monitoring program employing the pixel lensing method to search for microlensing events towards galactic globular clusters may increase the statistics and discriminate among different halo models. Stimulated by this proposal, ... More
Systematic biases on galaxy haloes parameters from Yukawa-like gravitational potentialsFeb 04 2011A viable alternative to the dark energy as a solution of the cosmic speed up problem is represented by Extended Theories of Gravity. Should this be indeed the case, there will be an impact not only on cosmological scales, but also at any scale, from the ... More
Uniform resolvent convergence for strip with fast oscillating boundaryJun 08 2012May 07 2013In a planar infinite strip with a fast oscillating boundary we consider an elliptic operator assuming that both the period and the amplitude of the oscillations are small. On the oscillating boundary we impose Dirichlet, Neumann or Robin boundary condition. ... More
Gaussian 1-2-1 Networks: Capacity Results for mmWave CommunicationsJan 08 2018Jun 17 2018This paper proposes a new model for wireless relay networks referred to as "1-2-1 network", where two nodes can communicate only if they point "beams" at each other, while if they do not point beams at each other, no signal can be exchanged or interference ... More
Surreal numbers with derivation, Hardy fields and transseries: a surveyAug 11 2016The present article surveys surreal numbers with an informal approach, from their very first definition to their structure of universal real closed analytic and exponential field. Then we proceed to give an overview of the recent achievements on equipping ... More
Scale and Möbius covariance in two-dimensional Haag-Kastler netJul 12 2018Given a two-dimensional Haag-Kastler net which is Poincar\'e-dilation covariant with additional properties, we prove that it can be extended to a M\"obius covariant net. Additional properties are either a certain condition on modular covariance, or a ... More
Surreal numbers with derivation, Hardy fields and transseries: a surveyAug 11 2016Oct 23 2016The present article surveys surreal numbers with an informal approach, from their very first definition to their structure of universal real closed analytic and exponential field. Then we proceed to give an overview of the recent achievements on equipping ... More
Invertible harmonic mappings, beyond KneserDec 22 2007Apr 08 2008We prove necessary and sufficient criteria of invertibility for planar harmonic mappings which generalize a classical result of H. Kneser, also known as the Rad\'{o}-Kneser-Choquet theorem.
Identifying sparse and dense sub-graphs in large graphs with a fast algorithmSep 17 2014Identifying the nodes of small sub-graphs with no a priori information is a hard problem. In this work, we want to find each node of a sparse sub-graph embedded in both dynamic and static background graphs, of larger average degree. We show that exploiting ... More
Tensor operators and Wigner-Eckart theorem for U_q->0(sl(2))Nov 24 1998Crystal tensor operators, which tranform under U_q->0(sl(2)), in analogous way as the vectors of the crystal basis, are introduced. The Wigner-Eckart theorem for the crystal tensor is defined: the selection rules depend on the initial state and on the ... More
On the mean field approximation of a stochastic model of tumor-induced angiogenesisAug 13 2017In the field of Life Sciences it it very common to deal with extremely complex systems, from both analytical and computational points of view, due to the unavoidable coupling of different interacting structures. As an example, angiogenesis has revealed ... More
Slice regular semigroupsMay 05 2016May 17 2016In this paper we introduce the notion of slice regular right linear semigroup in a quaternionic Banach space. It is an operatorial function which is slice regular (a noncommutative counterpart of analyticity) and which satisfies a noncommutative semigroup ... More
BV-norm continuity of sweeping processes driven by a set with constant shapeDec 29 2015Sep 06 2016We prove the BV-norm well posedness of sweeping processes driven by a moving convex set with constant shape, namely the BV-norm continuity of the so-called play operator of elasto-plasticity.
A remark on the genus of curves in $\mathbf P^4$May 02 2019Let $C$ be an irreducible, reduced, non-degenerate curve, of arithmetic genus $g$ and degree $d$, in the projective space $\mathbf P^4$ over the complex field. Assume that $C$ satisfies the following {\it flag condition of type $(s,t)$}: {$C$ does not ... More
Paired quantum Hall states on noncommutative two-toriMar 25 2010By exploiting the notion of Morita equivalence for field theories on noncommutative tori and choosing rational values of the noncommutativity parameter theta (in appropriate units), a one-to-one correspondence between an abelian noncommutative field theory ... More
Multifractal structure of Ly$α$ clouds: An example with the spectrum of QSO 0055--26Mar 15 1996Ly$\alpha$ forests are usually associated with intergalactic gas clouds intercepting the quasar sight--line. Using as an example the Ly$\alpha$ forest of QSO 0055--26 ($z_{em} = 3.66$), we show that the probability of observing a line at the velocity ... More
Two isomorphism criteria for directed colimitsDec 02 2013Using the general notions of finitely presentable and finitely generated object introduced by Gabriel and Ulmer in 1971, we prove that, in any (locally small) category, two sequences of finitely presentable objects and morphisms (or two sequences of finitely ... More
The spectrum of the cubic oscillatorJan 13 2012We prove the simplicity and analyticity of the eigenvalues of the cubic oscillator Hamiltonian,$H(\beta)=-d^2/dx^2+x^2+i\sqrt{\beta}x^3$,for $\beta$ in the cut plane $\C_c:=\C\backslash (-\infty, 0)$. Moreover, we prove that the spectrum consists of the ... More
Elliptic systems and material interpenetrationMay 31 2008We classify the second order, linear, two by two systems for which the two fundamental theorems for planar harmonic mappings, the Rado'-Kneser-Choquet Theorem and the H. Lewy Theorem, hold. They are those which, up to a linear change of variable, can ... More
On the Betti numbers of some semigroup ringsNov 06 2011For any numerical semigroup $S$, there are infinitely many numerical symmetric semigroups $T$ such that $S=\frac{T}{2}$ is their half. We are studying the Betti numbers of the numerical semigroup ring $K[T]$ when $S$ is a 3-generated numerical semigroup ... More
Polynomial-time Capacity Calculation and Scheduling for Half-Duplex 1-2-1 NetworksJan 09 2019This paper studies the 1-2-1 half-duplex network model, where two half-duplex nodes can communicate only if they point `beams' at each other; otherwise, no signal can be exchanged or interference can be generated. The main result of this paper is the ... More
Dynamical systems on graphs through the signless Laplacian matrixMar 10 2017There is a deep and interesting connection between the topological properties of a graph and the behaviour of the dynamical system defined on it. We analyse various kind of graphs, with different contrasting connectivity or degree characteristics, using ... More
Semigroups over real alternative *-algebras: generation theorems and spherical sectorial operatorsFeb 26 2014Jul 29 2014The aim of this paper is twofold. On one hand, generalizing some recent results obtained in the quaternionic setting, but using simpler techniques, we prove the generation theorems for semigroups in Banach spaces whose set of scalars belongs to the class ... More
Experimental and phenomenological comparison between Piezonuclear reactions and Condensed Matter Nuclear Science phenomenologyMar 06 2011The purpose of this paper is to place side by side the experimental results of Piezonu- clear reactions, which have been recently unveiled, and those collected during the last twenty years of experiments on low energy nuclear reactions (LENR). We will ... More
Systematics in the Gamma Ray Bursts Hubble diagramMay 05 2011Thanks to their enormous energy release which allows to detect them up to very high redshift, Gamma Rays Bursts (GRBs) have recently attracted a lot of interest to probe the Hubble diagram (HD) deep into the matter dominated era and hence complement Type ... More
Dark energy and dark matter as curvature effectsFeb 15 2006Mar 20 2006Astrophysical observations are pointing out huge amounts of dark matter and dark energy needed to explain the observed large scale structures and cosmic accelerating expansion. Up to now, no experimental evidence has been found, at fundamental level, ... More
Reconciling dark energy models with f(R) theoriesJan 20 2005Higher order theories of gravity have recently attracted a lot of interest as alternative candidates to explain the observed cosmic acceleration without the need of introducing any scalar field. A critical ingredient is the choice of the function f(R) ... More
Neutrinos superluminality and Local Lorentz InvarianceSep 24 2011Mar 02 2012The recent measurement of the neutrino velocity with the OPERA detector in the CNGS beam, on whose basis it was found that (v-c)/c = (2.48 \pm 0.28 (stat.) \pm 0.30 (sys.)) 10e-5, does not contain any significant violation of Local Lorentz Invariance ... More
The Principle of Solidarity: Geometrical Description of InteractionsSep 08 2011We discuss the possibility of geometrizing interactions by exploiting the "principle of solidarity" between space-time and the physical phenomena occurring in it (formulated by the Italian matematician B. Finzi in 1955). This is accomplished by means ... More
Speeding-up Thorium decayOct 26 2007We show that cavitation of a solution of thorium-228 in water induces its transformation at a rate 10000 times faster than the natural radioactive decay would do. This result agrees with the alteration of the secular equilibrium of thorium-234 obtained ... More
Gravitational lensing in fourth order gravityApr 20 2006Gravitational lensing is investigated in the weak field limit of fourth order gravity in which the Lagrangian of the gravitational field is modified by replacing the Ricci scalar curvature R with an analytical expression $f(R)$. Considering the case of ... More
Unified dark energy models : a phenomenological approachFeb 10 2004A phenomenological approach is proposed to the problem of universe accelerated expansion and of the dark energy nature. A general class of models is introduced whose energy density depends on the redshift $z$ in such a way that a smooth transition among ... More
Possible Experimental Evidence for Violation of Standard Electrodynamics, de Broglie Pilot Wave and Spacetime DeformationJun 28 2011We report and discuss the results of double-slit-like experiments in the infrared range, which evidence an anomalous behaviour of photon systems under particular (energy and space) constraints. These outcomes apparently disagree both with standard quantum ... More
Remarks on the cavitation of Thorium-228Jan 29 2010Jan 31 2010In this short note we would like to provide some useful remarks on our previous work about the piezonuclear decay of Thorium and in general about the methods and protocols that we used in the experiments on piezonuclear reactions. The purpose of these ... More
Low surface brightness galaxies rotation curves in the low energy limit of $R^n$ gravity : no need for dark matter?Mar 20 2006Dec 13 2006We investigate the possibility that the observed flatness of the rotation curves of spiral galaxies is not an evidence for the existence of dark matter haloes, but rather a signal of the breakdown of General Relativity. To this aim, we consider power ... More
Cosmography of f(R) gravityFeb 12 2008Jul 08 2008It is nowadays accepted that the universe is undergoing a phase of accelerated expansion as tested by the Hubble diagram of Type Ia Supernovae (SNeIa) and several LSS observations. Future SNeIa surveys and other probes will make it possible to better ... More
Lens modelling and H_0 estimate in quadruply lensed systemsJul 07 2004We present a numerical method to estimate the lensing parameters and the Hubble constant H_0 from quadruply imaged gravitational lens systems. The lens galaxy is modeled using both separable deflection potentials and constant mass-to-light ratio profiles, ... More
Spherical galaxy models with power law logarithmic slopeJan 10 2005We present a new family of spherically symmetric models for the luminous components of elliptical and spiral galaxies and their dark matter haloes. Our starting point is a general expression for the logarithmic slope $\alpha(r) = d\log{\rho}/d\log{r}$ ... More
The spherical-harmonics representation for the interaction between diatomic molecules: the general case and applications to CO-CO and CO-HFJun 04 2017The spherical-harmonics expansion is a mathematically rigorous procedure and a powerful tool for the representation of potential energy surfaces of interacting molecular systems, determining their spectroscopic and dynamical properties, specifically in ... More
Interactions of Hydrogen Molecules with Halogen-Containing Diatomics from Ab Initio Calculations: Spherical-Harmonics Representation and Characterization of the Intermolecular PotentialsMay 07 2017For the prototypical diatomic-molecule - diatomic molecule interactions H2-HX and H2-X2, where X = F, Cl, Br, quantum-chemical ab initio calculations are carried out on grids of the configuration space, which permit a spherical-harmonics representation ... More
Dynamical and gravitational lensing properties of a new phenomenological model of elliptical galaxiesNov 21 2006Recent observations of the line of sight velocity profile of elliptical galaxies have furnished controversial results with some works favouring the presence of a large amount of dark matter in the outer regions and others arguing in favour of no dark ... More
Some astrophysical implications of dark matter and gas profiles in a new galaxy clusters modelAug 09 2004The structure of the dark matter and the thermodynamical status of the hot gas in galaxy clusters is an interesting and widely discussed topic in modern astrophysics. Recently, Rasia et al. (2004) have proposed a new dynamical model for the mass density ... More
Inflessence: a phenomenological model for inflationary quintessenceJun 16 2005We present a phenomenologically motivated model which is able to give rise both to an inflationary epoch and to the present day cosmic acceleration. We introduce an approach where the energy density depends on the scale factor $a$ in such a way that a ... More
Piezonuclear neutrons from fracturing of inert solidsMar 18 2009Neutron emission measurements by means of helium-3 neutron detectors were performed on solid test specimens during crushing failure. The materials used were marble and granite, selected in that they present a different behaviour in compression failure ... More
f(R) theories of gravity in Palatini approach matched with observationsOct 06 2004We investigate the viability of f(R) theories in the framework of the Palatini approach as solutions to the problem of the observed accelerated expansion of the universe. Two physically motivated popular choices for f(R) are considered: power law, f(R) ... More
Reply to the "Comment on 'Piezonuclear decay of thorium' [Phys. Lett. A 373 (2009) 1956]" [Phys. Lett. A 373 (2009) 3795] by G. Ericsson et alOct 13 2009In a paper appearing in this issue of Physics Letters A, Ericsson et al. raise some critical comments on the experiment [F. Cardone, R. Mignani, A. Petrucci, Phys. Lett. A 373 (2009) 1956] we carried out by cavitating a solution of thorium-228, which ... More
Reply to "Comment on 'Piezonuclear decay of thorium' [Phys. Lett. A 373 (2009) 1956]" by L. KowalskiNov 19 2009In a paper appearing in this issue of Physics Letters A, Kowalski raises some critical comments on the experiment [F. Cardone, R. Mignani, A. Petrucci, Phys. Lett. A 373 (2009) 1956] that we carried out by cavitating a solution of thorium-228. The experiment ... More
Geometrical Lorentz Violation and Quantum Mechanical PhysicsMay 23 2013Jun 11 2013On the basis of the results of some experiments dealing with the violation of Local Lorentz Invariance (LLI) and on the formalism of the Deformed Special Relativity (DSR), we examine the connections between the local geometrical structure of space-time ... More
Metric Gauge Fields in Deformed Special RelativityMay 29 2013We show that, in the framework of Deformed Special Relativity (DSR), namely a (four-dimensional) generalization of the (local) space-time struc- ture based on an energy-dependent "deformation" of the usual Minkowski geometry, two kinds of gauge symmetries ... More
Nonlinear fractional magnetic Schrödinger equation: existence and multiplicitySep 24 2017In this paper we focus our attention on the following nonlinear fractional Schr\"odinger equation with magnetic field \begin{equation*} \varepsilon^{2s}(-\Delta)_{A/\varepsilon}^{s}u+V(x)u=f(|u|^{2})u \quad \mbox{ in } \mathbb{R}^{N}, \end{equation*} ... More
Néron-Severi group of a general hypersurfaceJun 24 2015Jan 11 2016In this paper we extend the well known theorem of Angelo Lopez concerning the Picard group of the general space projective surface containing a given smooth projective curve, to the intermediate N\'eron-Severi group of a general hypersurface in any smooth ... More
Feasibility Analysis of Sporadic Real-Time Multiprocessor Task SystemsApr 12 2010We give the first algorithm for testing the feasibility of a system of sporadic real-time tasks on a set of identical processors, solving one major open problem in the area of multiprocessor real-time scheduling [S.K. Baruah and K. Pruhs, Journal of Scheduling, ... More