Results for "Lorenzo Maggi"

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Lower Bounds for the Fair Resource Allocation ProblemFeb 08 2018The $\alpha$-fair resource allocation problem has received remarkable attention and has been studied in numerous application fields. Several algorithms have been proposed in the context of $\alpha$-fair resource sharing to distributively compute its value. ... More
PuppetDroid: A User-Centric UI Exerciser for Automatic Dynamic Analysis of Similar Android ApplicationsFeb 19 2014Popularity and complexity of malicious mobile applications are rising, making their analysis difficult and labor intensive. Mobile application analysis is indeed inherently different from desktop application analysis: In the latter, the interaction of ... More
Tracking and Characterizing Botnets Using Automatically Generated DomainsNov 21 2013Modern botnets rely on domain-generation algorithms (DGAs) to build resilient command-and-control infrastructures. Recent works focus on recognizing automatically generated domains (AGDs) from DNS traffic, which potentially allows to identify previously ... More
Adapting Caching to Audience Retention Rate: Which Video Chunk to Store?Dec 10 2015Rarely do users watch online contents entirely. We study how to take this into account to improve the performance of cache systems for video-on-demand and video-sharing platforms in terms of traffic reduction on the core network. We exploit the notion ... More
A Goal Programming Model with Satisfaction Function for Risk Management and Optimal Portfolio DiversificationJan 09 2012Sep 19 2012We extend the classical risk minimization model with scalar risk measures to the general case of set-valued risk measures. The problem we obtain is a set-valued optimization model and we propose a goal programming-based approach with satisfaction function ... More
Online and Global Network Optimization: Towards the Next-Generation of Routing PlatformsFeb 04 2016The computation power of SDN controllers fosters the development of a new generation of control plane that uses compute-intensive operations to automate and optimize the network configuration across layers. From now on, cutting-edge optimization and machine ... More
Post-Newtonian direct and mixed orbital effects due to the oblateness of the central bodyFeb 22 2014Jun 15 2015The orbital dynamics of a test particle moving in the non-spherically symmetric field of a rotating oblate primary is impacted also by certain indirect, mixed effects arising from the interplay of the different Newtonian and post-Newtonian accelerations ... More
On the effects of the Dvali-Gabadadze-Porrati braneworld gravity on the orbital motion of a test particleApr 12 2005Aug 20 2005In this paper we explicitly work out the secular perturbations induced on all the Keplerian orbital elements of a test body to order O(e^2) in the eccentricity e by the weak-field long-range modifications of the usual Newton-Einstein gravity due to the ... More
Planet X revamped after the discovery of the Sedna-like object 2012 VP$_{113}$?Mar 31 2014Jul 17 2014The recent discovery of the Sedna-like dwarf planet 2012 VP$_{\rm 113}$ by Trujillo and Sheppard has revamped the old-fashioned hypothesis that a still unseen trans-Plutonian object of planetary size, variously dubbed over the years as Planet X, Tyche, ... More
Electromagnetism and multiple-valued loop-dependent wave functionalsOct 14 2009We quantize the Maxwell theory in the presence of a electric charge in a "dual" Loop Representation, i.e. a geometric representation of magnetic Faraday's lines. It is found that the theory can be seen as a theory without sources, except by the fact that ... More
Maxwell Chern Simons Theory in a Geometric RepresentationAug 04 2000We quantize the Maxwell Chern Simons theory in a geometric representation that generalizes the Abelian Loop Representation of Maxwell theory. We find that in the physical sector, the model can be seen as the theory of a massles scalar field with a topological ... More
All-order results for soft and collinear gluonsJun 20 2008I briefly review some general features and some recent developments concerning the resummation of long-distance singularities in QCD and in more general non-abelian gauge theories. I emphasize the field-theoretical tools of the trade, and focus mostly ... More
On power corrections to event shapesNov 01 2002Recent work on the theme of power corrections in perturbative QCD is briefly reviewed, with an emphasis on event shapes in e+ e- annihilation. The factorization of soft gluon effects is the main tool: it leads to resummation, and thus highlights the limitations ... More
Analytic resummation and power corrections for DIS and Drell--YanSep 19 2001Dimensional continuation is applied to resummed expressions for the DIS and Drell-Yan partonic cross sections, to regularize the Landau pole. Simple analytic expression are obtained, encoding information about nonperturbative power--suppressed effects. ... More
Springer correspondence via p-adic analytic methodsOct 08 2002We show that the standard proof of the Springer correspondence in positive characteristic (via Deligne-Fourier transform) works verbatim in characteristic zero, up to replacing Deligne-Fourier transform by another etale Fourier transform introduced by ... More
Local monodromy in non-archimedean analytic geometry -- fifth releaseOct 27 2003Jun 18 2004We study the topology of the punctured disc defined over a non-archimedean field of characteristic zero. Chapter two includes a new proof of the so-called p-adic Riemann existence theorem. This release completes the study of breaks and break decompositions ... More
The Ep,i - Eiso correlation in GRBs: updated observational status, re-analysis and main implicationsJan 24 2006Jul 20 2006The correlation between the cosmological rest-frame nuFnu spectrum peak energy, Ep,i, and the isotropic equivalent radiated energy, Eiso, discovered by Amati et al. in 2002 and confirmed/extended by subsequent osbervations, is one of the most intriguing ... More
The transition matroid of a 4-regular graph: an introductionJul 30 2013Mar 11 2015Given a 4-regular graph $F$, we introduce a binary matroid $M_{\tau}(F)$ on the set of transitions of $F$. Parametrized versions of the Tutte polynomial of $M_{\tau}(F)$ yield several well-known graph and knot polynomials, including the Martin polynomial, ... More
Minimal Z' models and the 125 GeV Higgs bosonMar 05 2013Jan 29 2014The 1-loop renormalization group equations for the minimal Z' models encompassing a type-I seesaw mechanism are studied in the light of the 125 GeV Higgs boson discovery. This model is taken as a benchmark for the general case of singlet extensions of ... More
Fluctuations for a conservative interface model on a wallNov 05 2007We consider an effective interface model on a hard wall in (1+1) dimensions, with conservation of the area between the interface and the wall. We prove that the equilibrium fluctuations of the height variable converge in law to the solution of a SPDE ... More
A conservative evolution of the Brownian excursionNov 07 2007We consider the problem of conditioning the Brownian excursion to have a fixed time average over the interval [0,1] and we study an associated stochastic partial differential equation with reflection at 0 and with the constraint of conservation of the ... More
Chemical abundances of RGB-Tip stars in the Sagittarius dwarf Spheroidal galaxyOct 29 2004We present preliminary iron abundances and $\alpha$ element (Ca, Mg) abundance ratios for a sample of 22 Red Giant Branch (RGB) Stars in the Sagittarius dwarf spheroidal galaxy (Sgr), selected near the RGB-Tip. The sample is representative of the Sgr ... More
Subspace Least Square Approach for Drift Removal with Application to Herschel DataJan 07 2013We present a method to estimate and remove the baseline drift affecting the data produced by the two infrared imaging photometers onboard the ESA Herschel satellite, namely PACS and SPIRE. The method exploits a Least Square approach which is performed ... More
Finitely Balanced Sequences and Plasticity of 1-Dimensional TilingsJan 21 2015Mar 23 2015We relate a balancing property of letters for bi-infinite sequences to the invariance of the resulting 1-dimensional tiling dynamics under changes in the lengths of the tiles. If the language of the sequence space is finitely balanced, then all length ... More
Tilings, tiling spaces and topologyJun 02 2005To understand an aperiodic tiling (or a quasicrystal modeled on an aperiodic tiling), we construct a space of similar tilings, on which the group of translations acts naturally. This space is then an (abstract) dynamical system. Dynamical properties of ... More
Simple Type is Not a Boundary PhenomenonDec 22 1997This is an expository article, explaining recent work by D. Groisser and myself [GS] on the extent to which the boundary region of moduli space contributes to the ``simple type'' condition of Donaldson theory. The presentation is intended to complement ... More
"Weak yet strong" restrictions of Hindman's Finite Sums TheoremOct 24 2016We present a natural restriction of Hindman's Finite Sums Theorem that admits a simple combinatorial proof (one that does not also prove the full Finite Sums Theorem) and low computability-theoretic and proof-theoretic upper bounds, yet implies the existence ... More
Realistic modellization for the growth of a yeast colonyNov 20 2001An evolving yeast colony is simulated by means of a cellular automaton that takes care of many important features of the system under study. A complete survey of the properties of the colony is done and a set of scaling relations is found, together with ... More
Skewness and kurtosis unbiased by Gaussian uncertaintiesApr 24 2013Mar 20 2014Noise is an unavoidable part of most measurements which can hinder a correct interpretation of the data. Uncertainties propagate in the data analysis and can lead to biased results even in basic descriptive statistics such as the central moments and cumulants. ... More
Weighted skewness and kurtosis unbiased by sample sizeApr 24 2013Apr 28 2013Central moments and cumulants are often employed to characterize the distribution of data. The skewness and kurtosis are particularly useful for the detection of outliers, the assessment of departures from normally distributed data, automated classification ... More
Electron Heating by the Ion Cyclotron Instability in Collisionless Accretion Flows. II. Electron Heating Efficiency as a Function of Flow ConditionsNov 21 2014In the innermost regions of low-luminosity accretion flows, including Sgr A* at the center of our Galaxy, the frequency of Coulomb collisions is so low that the plasma is two-temperature, with the ions substantially hotter than the electrons. This paradigm ... More
ALF gravitational instantons and collapsing Ricci-flat metrics on the K3 surfaceMar 21 2016We construct large families of new collapsing hyperk\"ahler metrics on the K3 surface. The limit space is the quotient of a flat 3-torus by an involution. Away from finitely many exceptional points the collapse occurs with bounded curvature. There are ... More
Occupation densities for SPDE's with reflectionApr 25 2002We consider the solution (u,\eta) of the white-noise driven stochastic partial differential equation with reflection on the space interval [0,1] introduced by Nualart and Pardoux. First, we prove that at any fixed time t>0, the measure \eta([0,t]\times ... More
Pricing joint claims on an asset and its realized variance under stochastic volatility modelsJun 11 2012In a stochastic volatility framework, we find a general pricing equation for the class of payoffs depending on the terminal value of a market asset and its final quadratic variation. This allows a pricing tool for European-style claims paying off at maturity ... More
Sudakov logs and power corrections for selected event shapesSep 17 2004I summarize the results of recent studies analyzing perturbative and nonperturbative effects of soft gluon radiation on the distributions of the C-parameter and of the class of angularities, by means of dressed gluon exponentiation.
Hasse-Arf filtrations in $p$-adic analytic geometry -- Fourth ReleaseMar 08 2007May 10 2009We the study of the monodromy of local systems with bounded ramification on a punctured disc defined over a non-archimedean valued field of characteristic zero. First, we construct the local Fourier transforms and we establish their main properties. Also, ... More
The Higgs sector of the minimal SUSY $B-L$ modelApr 21 2015Jun 25 2015I review the Higgs sector of the $U(1)_{B-L}$ extension of the minimal supersymmetric standard model (MSSM). I will show that the gauge kinetic mixing plays a crucial role in the Higgs phenomenology. Two light bosons are present, a MSSM-like one and a ... More
Lecture Notes on Differential FormsApr 26 2016This is a series of lecture notes, with embedded problems, aimed at students studying differential topology. Many revered texts, such as Spivak's "Calculus on Manifolds" and Guillemin and Pollack's "Differential Topology" introduce forms by first working ... More
Some Generalizations of the Pinwheel TilingDec 24 1997We introduce a new family of nonperiodic tilings, based on a substitution rule that generalizes the pinwheel tiling of Conway and Radin. In each tiling the tiles are similar to a single triangular prototile. In a countable number of cases, the tiles appear ... More
Convergence of approximations of monotone gradient systemsMar 20 2006We consider stochastic differential equations in a Hilbert space, perturbed by the gradient of a convex potential. We investigate the problem of convergence of a sequence of such processes. We propose applications of this method to reflecting O.U. processes ... More
Black hole microstates from branes at angleOct 19 2016We derive the leading g_s perturbation of the SUGRA fields generated by a supersymmetric configuration of respectively 1, 2 or 4 D3-branes intersecting at an arbitrary angle via the computation of the string theory disk scattering amplitude of one massless ... More
Weighted statistical parameters for irregularly sampled time seriesApr 24 2013Sep 06 2013Unevenly spaced time series are common in astronomy because of the day-night cycle, weather conditions, dependence on the source position in the sky, allocated telescope time, corrupt measurements, for example, or be inherent to the scanning law of satellites ... More
Conceptual and mathematical modeling of insect-borne plant diseases: theory and application to flavescence doree in grapevineAug 28 2014Insect-borne plant diseases recur commonly in wild plants and in agricultural crops, and are responsible for severe losses in terms of produce yield and monetary return. Mathematical models of insect-borne plant diseases are therefore an essential tool ... More
A Closer Earth and the Faint Young Sun Paradox: Modification of the Laws of Gravitation, or Sun/Earth Mass Losses?Jun 12 2013Oct 11 2013Given a solar luminosity L_Ar = 0.75 L_0 at the beginning of the Archean 3.8 Gyr ago, where L_0 is the present-day one, if the heliocentric distance r of the Earth was r_Ar = 0.956 r_0, the solar irradiance would have been as large as I_Ar = 0.82 I_0. ... More
Preliminary bounds of the gravitational Local Position Invariance from Solar System planetary precessionsJul 17 2013Nov 05 2013In the framework of the Parameterized Post-Newtonian (PPN) formalism, we calculate the long-term Preferred Location (PL) effects, proportional to the Whitehead parameter $\xi$, affecting all the Keplerian orbital elements of a localized two-body system, ... More
Modified theories of gravity with nonminimal coupling and orbital particle dynamicsJun 17 2013Feb 25 2014We consider a non-rotating, massive test particle acted upon by a "pressure"-type, non-geodesic acceleration arising from a certain general class of gravitational theories with nonminimal coupling between the matter and the metric. The resulting orbital ... More
Exact expressions for the pericenter precession caused by some Dark Matter distributions and constraints on them from orbital motions in the Solar System, in the double pulsar and in the Galactic centerApr 23 2013May 16 2013We analytically calculate the secular precession of the pericenter of a test particle orbiting a central body surrounded by a continuous distribution of Dark Matter (DM) by using some commonly adopted density profiles for it. We obtain exact expressions ... More
Juno, the angular momentum of Jupiter and the Lense-Thirring effectDec 08 2008Jan 19 2010The recently approved Juno mission will orbit Jupiter for one year in a highly eccentric (r_min=1.06R_Jup, r_max=39R_Jup) polar orbit (i=90 deg) to accurately map, among other things, the jovian magnetic and gravitational fields. Such an orbital configuration ... More
On the anomalous increase of the lunar eccentricityMay 24 2011Possible explanations of the recently reported anomalous increase of the eccentricity of the lunar orbit are sought in terms of classical Newtonian mechanics, general relativity, and long-range modifications of gravity.
A gluing construction for periodic monopolesNov 25 2014Jan 30 2015We construct periodic monopoles (with singularities), i.e. monopoles on $\mathbb{R}^{2} \times \mathbb{S}^{1}$ possibly singular at a finite collection of points, by gluing methods.
On the Brownian meander and excursion conditioned to have a fixed time averageMay 29 2006Feb 04 2007We study the density of the time average of the Brownian meander/excursion over the time interval [0,1]. Moreover we give an expression for the Brownian meander/excursion conditioned to have a fixed time average.
Exact Regularity and the Cohomology of Tiling SpacesApr 13 2010The Exact Regularity Property was introduced recently as a property of homological Pisot substitutions in one dimension. In this paper, we consider exact regularity for arbitrary tiling spaces. Let $\bT$ be a $d$ dimensional repetitive tiling, and let ... More
Solutions of the Bohr hamiltonian, a compendiumNov 22 2004The Bohr hamiltonian, also called collective hamiltonian, is one of the cornerstone of nuclear physics and a wealth of solutions (analytic or approximated) of the associated eigenvalue equation have been proposed over more than half a century (confining ... More
Break-up and electromagnetic response of light weakly-bound dicluster systemsSep 04 2002Sep 05 2002This study is focused on the break-up and electromagnetic response of light weakly-bound dicluster nuclei. The cluster picture in the case of $ ^7$Li is shown to be a very good approximation and in this framework we calculate nuclear structure observables. ... More
Soft triaxial roto-vibrational motion in the vicinity of $γ=π/6$Jun 15 2004A solution of the Bohr collective hamiltonian for the $\beta-$soft, $\gamma-$soft triaxial rotor with $\gamma \sim \pi/6$ is presented making use of a harmonic potential in $\gamma$ and Coulomb-like and Kratzer-like potentials in $\beta$. It is shown ... More
Study of Giant Pairing Vibrations with neutron-rich nucleiJun 04 2002We investigate the possible signature of the presence of giant pairing states at excitation energy of about 10 MeV via two-particle transfer reactions induced by neutron-rich weakly-bound projectiles. Performing particle-particle RPA calculations on $^{208}$Pb ... More
Concentration-diffusion effects in viscous incompressible flowsApr 02 2008Given a finite sequence of times $0<t_1<...<t_N$, we construct an example of a smooth solution of the free nonstationnary Navier--Stokes equations in $\R^d$, $d=2,3$, such that: (i) The velocity field $u(x,t)$ is spatially poorly localized at the beginning ... More
Fine properties of self-similar solutions of the Navier-Stokes equationsMar 03 2008We study the solutions of the nonstationary incompressible Navier--Stokes equations in $\R^d$, $d\ge2$, of self-similar form $u(x,t)=\frac{1}{\sqrt t}U\bigl(\frac{x}{\sqrt t}\bigr)$, obtained from small and homogeneous initial data $a(x)$. We construct ... More
Commentary to "LARES successfully launched in orbit: Satellite and mission description" by A. Paolozzi and I. CiufoliniNov 27 2013We comment on some statements in a recent paper by Paolozzi and Ciufolini concerning certain remarks raised by us on the realistic accuracy obtainable in testing the general relativistic Lense-Thirring effect in the gravitational field of the Earth with ... More
The lingering anomalous secular increase of the eccentricity of the orbit of the Moon: further attempts of explanation of cosmological originApr 26 2014A new analysis of extended data records collected with the Lunar Laser Ranging (LLR) technique performed with improved tidal models was not able to resolve the issue of the anomalous rate $\dot e$ of the eccentricity $e$ of the orbit of the Moon, which ... More
A flyby anomaly for Juno? Not from standard physicsNov 17 2013Jun 19 2014An empirical formula recently appeared in the literature to explain the observed anomalies of about $\Delta\dot\rho\approx 1-10$ mm s$^{-1}$ in the geocentric range-rates $\dot\rho$ of the Galileo, NEAR and Rosetta spacecraft at some of their past perigee ... More
Integration by parts on the law of the reflecting Brownian motionApr 27 2004We prove an integration by parts formula on the law of the reflecting Brownian motion $X:=|B|$ in the positive half line, where $B$ is a standard Brownian motion. In other terms, we consider a perturbation of $X$ of the form $X^\epsilon = X+\epsilon h$ ... More
Testing a recently proposed scenario for a transplutonian planetoid with the EPM2013 planetary ephemeridesJul 19 2014Aug 19 2014By means of the orbital dynamics of the known Sun's outer planets, we use the just released EPM2013 planetary ephemerides to put on the test the recently proposed hypothesis that one (or more) still unseen super-Earth(s) may lurk at about $200-250$ astronomical ... More
A new general relativistic clock effect for counter-rotating test particles in the gravitoelectric field of a non-rotating bodyJul 17 2014It is known that, in the weak-field and slow-motion approximation of general relativity, the stationary component of the gravitational field of a rotating body, proportional to its angular momentum, is able to discriminate between the opposite directions ... More
Relationship Between the Uncompensated Price-Elasticity and the Income-Elasticity of Demand Under Conditions of Additive PreferencesFeb 27 2016Mar 28 2016Income- and price-elasticity of demand quantify the responsiveness of markets to changes in income, and in prices, respectively. Under the assumptions of utility maximization and preference-independence (additive preferences), mathematical relationships ... More
Unusual Corrections to the Scaling of the Entanglement Entropy of the Excited states in Conformal Field TheoryJan 07 2016In this paper we study the scaling of the correction of the Renyi entropy of the excited states in systems described, in the continuum limit, by a conformal field theory (CFT). These corrections scale as $L^{-\frac{2\Delta}{n}}$, where $L$ is the system ... More
Perturbation theory for string sigma modelsApr 06 2016Apr 07 2016In this thesis we investigate quantum aspects of the Green-Schwarz superstring in various AdS backgrounds relevant for the AdS/CFT correspondence, providing several examples of perturbative computations in the corresponding integrable sigma-models. We ... More
Orbital motions as gradiometers for post-Newtonian tidal effectsJun 10 2014Jul 31 2014The direct long-term changes occurring in the orbital dynamics of a local gravitationally bound binary system $S$ due to the post-Newtonian tidal acceleration caused by an external massive source are investigated. A class of systems made of a test particle ... More
Editorial for the Special Issue 100 Years of Chronogeometrodynamics: The Status of the Einstein's Theory of Gravitation in Its Centennial YearApr 21 2015Apr 23 2015The present Editorial introduces the Special Issue dedicated by the journal Universe to the General Theory of Relativity, the beautiful theory of gravitation of Einstein, a century after its birth. It reviews some of its key features in a historical perspective, ... More
The growing toolbox of perturbative QCDJan 09 2016Advances in perturbative QCD techniques have been crucial for the successful interpretation of the data collected in Run I of LHC, and for the discovery of the Higgs boson. I will very briefly highlight some recent additions to the QCD toolbox, and note ... More
Preliminary constraints on the location of Telisto/Planet Nine from planetary orbital dynamicsDec 16 2015Oct 19 2016(Abridged) The trajectory of Saturn is nowadays known at essentially the same accuracy level of the inner planets due to the telemetry of the Cassini spacecraft. Thus, the expected perturbations $\dot\varpi,~\dot\Omega$ due to PX, for which we suggest ... More
Valuation of asset and volatility derivatives using decoupled time-changed Lévy processesOct 19 2012Jan 31 2015In this paper we propose a general derivative pricing framework which employs decoupled time-changed (DTC) L\'evy processes to model the underlying asset of contingent claims. A DTC L\'evy process is a generalized time-changed L\'evy process whose continuous ... More
What's wrong with the Platonic ideal of space and time?Sep 28 2016This is a chapter for an upcoming book, "Space, Time, and the Limits of Human Understanding", edited by Shyam Wuppuluri and Giancarlo Ghirardi. I first present the classical picture of flat space and ever-flowing time, as generally accepted until about ... More
Büchi Automata can have Smaller QuotientsFeb 16 2011Apr 26 2011We study novel simulation-like preorders for quotienting nondeterministic B\"uchi automata. We define fixed-word delayed simulation, a new preorder coarser than delayed simulation. We argue that fixed-word simulation is the coarsest forward simulation-like ... More
The free wreath product of a discrete group by a quantum automorphism groupJul 13 2014Mar 10 2016Let $\mathbb{G}$ be the quantum automorphism group of a finite dimensional C*-algebra $(B,\psi)$ and $\Gamma$ a discrete group. We want to compute the fusion rules of $\widehat{\Gamma}\wr_* \mathbb{G}$. First of all, we will revise the representation ... More
Absorbing-state phase transition in biased activated random walkMar 08 2014May 31 2015We consider the activated random walk (ARW) model on $\mathbb{Z}^d$, which undergoes a transition from an absorbing regime to a regime of sustained activity. In any dimension we prove that the system is in the active regime when the particle density is ... More
On the interlace polynomialsJul 31 2010Sep 20 2012The generating function that records the sizes of directed circuit partitions of a connected 2-in, 2-out digraph D can be determined from the interlacement graph of D with respect to a directed Euler circuit; the same is true of the generating functions ... More
On the linear algebra of local complementationJan 06 2011Jun 26 2011We explore the connections between the linear algebra of symmetric matrices over GF(2) and the circuit theory of 4-regular graphs. In particular, we show that the equivalence relation on simple graphs generated by local complementation can also be generated ... More
Post-Keplerian corrections to the orbital periods of a two-body system and their measurabilityJul 17 2014May 25 2016The orbital motion of a binary system is characterized by various characteristic temporal intervals which, by definition, are different from each other: the draconitic, anomalistic and sidereal periods. They all coincide in the Keplerian case. Such a ... More
Fuzzballs in general relativity: a missed opportunityNov 16 2016Nov 27 2016Recently some 4d asymptotically $AdS_2 \times S^2$ regular bubbling solutions written in terms of an arbitrary profile function has appeared in literature. We discuss the possibility of extending these solutions to asymptotically flat spaces, therefore ... More
Non-trivial translation-invariant valuations on $L^\infty$May 01 2015Translation-invariant valuations on the space $L^\infty(\mathbb{R}^n)$ are examined. We prove that such functionals vanish on functions with compact support. Moreover a rich family of non-trivial translation-invariant valuations on $L^\infty(\mathbb{R}^n)$ ... More
White dwarfs constraints on dark sector models with light particlesOct 18 2013The white dwarf luminosity function is well understood in terms of standard model physics and leaves little room for exotic cooling mechanisms related to the possible existence of new weakly interacting light particles. This puts significant constraints ... More
Effects of theta on the deuteron binding energy and the triple-alpha processNov 10 2008Aug 21 2009We study the effects that a non zero strong-CP-violating parameter theta would have on the deuteron and diproton binding energies and on the triple-alpha process. Both these systems exhibit fine tuning, so it is plausible that a small change in the nuclear ... More
Critical probabilities and convergence time of Percolation Probabilistic Cellular AutomataDec 25 2013Nov 26 2014This paper considers a class of probabilistic cellular automata undergoing a phase transition with an absorbing state. Denoting by ${\mathcal{U}}(x)$ the neighbourhood of site $x$, the transition probability is $T(\eta_x = 1 | \eta_{{\mathcal{U}}(x)}) ... More
Kinetic equations: computationNov 28 2013Kinetic equations bridge the gap between a microscopic description and a macroscopic description of the physical reality. Due to the high dimensionality the construction of numerical methods represents a challenge and requires a careful balance between ... More
Deformation theory of nearly Kähler manifoldsJan 18 2016Nearly K\"ahler manifolds are the Riemannian 6-manifolds admitting real Killing spinors. Equivalently, the Riemannian cone over a nearly K\"ahler manifold has holonomy contained in G2. In this paper we study the deformation theory of nearly K\"ahler manifolds, ... More
Generalized connected sum construction for scalar flat metricsNov 25 2006In this paper we will show that the generalized connected sum construction for constant scalar curvature metrics can be extended to the zero scalar curvature case. In particular we want to construct solutions to the Yamabe equation on the generalized ... More
Revisiting CP-violation in Minimal Flavour ViolationMar 26 2009After a brief review of the minimal flavour violation hypothesis and its implementation in the MSSM, the most general parametrisation of the soft supersymmetry-breaking terms by means of the charged lepton and neutrino spurions is constructed. Thereby ... More
Two-body orbit expansion due to time-dependent relative acceleration rate of the cosmological scale factorDec 27 2013Jan 02 2014By phenomenologically assuming a slow temporal variation of the percent acceleration rate $\ddot S S^{-1}$ of the cosmic scale factor $S(t)$, it is shown that the orbit of a local binary undergoes a secular expansion. To first order in the power expansion ... More
On a recent preliminary study for the measurement of the Lense-Thirring effect with the Galileo satellitesNov 24 2013Jan 01 2014It has been recently proposed to combine the node drifts of the future constellation of 27 Galileo spacecraft together with those of the existing LAGEOS-type satellites to improve the accuracy of the past and ongoing tests of the Lense-Thirring (LT) effect ... More
Orbital motions and the conservation-law/preferred-frame $α_3$ parameterSep 27 2013Sep 12 2014We analytically calculate some orbital effects induced by the Lorentz-invariance/momentum-conservation PPN parameter $\alpha_3$ in a gravitationally bound binary system made of a compact primary orbited by a test particle. We neither restrict ourselves ... More
Semi-analytical formulas for the Hertzsprung-Russell DiagramNov 27 2008The absolute visual magnitude as function of the observed colour (B-V), also named Hertzsprung-Russell diagram can be described through five equations; that in presence of calibrated stars means eight constants. The developed framework allows to deduce ... More
Electric-Magnetic duality and the "Loop Representation" in Abelian Gauge TheoriesMar 01 1996Abelian Gauge Theories are quantized in a geometric representation that generalizes the Loop Representation and treates electric and magnetic operators on the same footing. The usual canonical algebra is turned into a topological algebra of non local ... More
Knot Invariants from Classical Field TheoriesNov 17 1999We consider the Non-Abelian Chern-Simons term coupled to external particles, in a gauge and diffeomorphism invariant form. The classical equations of motion are perturbativelly studied, and the on-shell action is shown to produce knot-invariants associated ... More
Potential log canonical centersDec 01 2015Given an ambient variety $X$ and a fixed subvariety $Z$ we give sufficient conditions for the existence of a boundary $\Delta$ such that $Z$ is a log canonical center for the pair $(X, \Delta)$. We also show that under some additional hypotheses $\Delta$ ... More
Circuit partitions and signed interlacement in 4-regular graphsJul 14 2016Aug 07 2016Let $F$ be a 4-regular graph. Each circuit partition $P$ of $F$ has a corresponding touch-graph $Tch(P)$; the circuits in $P$ correspond to vertices of $Tch(P)$, and the vertices of $F$ correspond to edges of $Tch(P)$. We discuss the connection between ... More
Notes on a theorem of NajiJul 02 2015Jan 28 2016We present a new proof of an algebraic characterization of circle graphs due to W. Naji. For bipartite graphs, Naji's theorem is equivalent to an algebraic characterization of planar matroids due to J. Geelen and B. Gerards. Naji's theorem also yields ... More
Splitting cubic circle graphsApr 05 2015We show that every 3-regular circle graph has at least two pairs of twin vertices; consequently no such graph is prime with respect to the split decomposition. We also deduce that up to isomorphism, K_4 and K_{3,3} are the only 3-connected, 3-regular ... More
Resonant mono Higgs at the LHCDec 20 2015Jan 04 2016In recent years, the production of a SM particle with large missing transverse momentum, dubbed mono-X searches, have gained increasing attention. After the discovery of the Higgs boson in 2012, the run-II of the LHC will now scrutinise its properties, ... More
Phenomenology of the minimal B-L extension of the Standard Model at the LHCJun 22 2011A well-motivated framework to naturally introduce neutrino masses is the B-L model, a U(1) extension of the standard model related to the baryon minus lepton gauged number. Besides three right-handed neutrinos, that are included to cancel the anomalies ... More