Results for "Angelos Tsiaras"

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High-precision stellar limb-darkening in exoplanetary transitsApr 26 2017Aug 31 2017Characterization of the atmospheres of transiting exoplanets relies on accurate measurements of the extent of the optically thick area of the planet at multiple wavelengths with a precision $\lesssim$100 parts per million (ppm). Next-generation instruments ... More
Integrating light-curve and atmospheric modelling of transiting exoplanetsNov 12 2018Spectral retrieval techniques are currently our best tool to interpret the observed exoplanet atmospheric data. Said techniques retrieve the optimal atmospheric components and parameters by identifying the best fit to an observed transmission/emission ... More
Evidence for Atmospheric Cold-trap Processes in the Noninverted Emission Spectrum of Kepler-13Ab Using HST/WFC3Dec 19 2016Sep 13 2017We observed two eclipses of the Kepler-13A planetary system, on UT 2014 April 28 and UT 2014 October 13, in the near-infrared using Wide Field Camera 3 on the Hubble Space Telescope. By using the nearby binary stars Kepler-13BC as a reference, we were ... More
Some observations on compact indestructible spacesNov 15 2012Inspired by a recent work of Dias and Tall, we show that a compact indestructible space is sequentially compact. We also prove that a Lindelof Hausdorff indestructible space has the finite derived set property and a compact Hausdorff indestructible space ... More
On the emergence of the Lorentz signature in an expanding universeJul 03 2012A mechanism producing the transition from an Euclidean to a Loretzian manifold is described. A global Robertson-Walker symmetry is assumed from the large scale data of the visible universe. Allowing for the strain of the manifold as an additional field ... More
Stochastic Schroedinger Equations with General Complex Gaussian NoisesSep 30 2002Apr 11 2003Within the framework of stochastic Schroedinger equations, we show that the correspondence between statevector equations and ensemble equations is infinitely many to one, and we discuss the consequences. We also generalize the results of [Phys. Lett. ... More
Lengths on rotating platformsAug 03 1998Sep 10 1998The paper treats the issue of the length of a rotating circumference as seen from on board the moving disk and from an inertial reference frame. It is shown that, properly defining a measuring process, the result is in both cases 2piR thus dissolving ... More
The deformation theory of local complete intersectionsMar 06 1997Apr 12 1999This is an expository paper on the subject of the title. It assumes basic scheme theory, commutative and homological algebra.
Science and the Future: IntroductionNov 30 2013The contradiction between physical and economical sciences concerning the growth of the production/consumption mechanism is analyzed. It is then shown that if one wishes to keep the security level stable or to enhance it in a growing economy the cost ... More
Experimental determination of gravitomagnetic effects by means of ring lasersDec 12 2012A new experiment aimed to the detection of the gravito-magnetic Lense-Thirring effect at the surface of the Earth will be presented; the name of the experiment is GINGER. The proposed technique is based on the behavior of light beams in ring lasers, also ... More
Speaker-independent raw waveform model for glottal excitationApr 25 2018Recent speech technology research has seen a growing interest in using WaveNets as statistical vocoders, i.e., generating speech waveforms from acoustic features. These models have been shown to improve the generated speech quality over classical vocoders ... More
Can rotation curves reveal the opacity of spiral galaxies ?Jan 18 2005Long-slit optical spectra along the major axis of spiral galaxies constitute a main source of information concerning the kinematics of galaxies. In highly inclined spiral galaxies the long-slit spectrum is distorted by dust, which obscures the innermost ... More
Semiclassical description of D-branes in SL(2)/U(1) gauged WZW modelApr 02 2003May 22 2003In this note we examine some semiclassical features of D-branes in the SL(2)/U(1) gauged WZW model and determine the small fluctuation spectra for one class of branes. We compare our results with expectations from the CFT side.
Testing General RelativityMar 03 2015This lecture will present a review of the past and present tests of the General Relativity theory. The essentials of the theory will be recalled and the measurable effects will be listed and analyzed. The main historical confirmations of General Relativity ... More
Relativistic space-time positioning: principles and strategiesDec 03 2012Starting from the description of space-time as a curved four-dimensional manifold, null Gaussian coordinates systems as appropriate for relativistic positioning will be discussed. Different approaches and strategies will be reviewed, implementing the ... More
Measuring the angle $γ$ from penguin decays at LHCbFeb 04 2011In this paper we present first LHCb results on charmless charged two- and three-body $B$ meson decays. In particular, using the first picobarn of integrated luminosity, LHCb observed the $B^{0}\rightarrow K^{+}\pi^{-}$ and $B^{+}\rightarrow K^{+}\pi^{+}\pi^{-}$ ... More
Space Time Defects as a Source of Curvature and TorsionOct 28 2004Space time is described as a continuum four-dimensional medium similar to ordinary elastic continua. Exploiting the analogy internal stress states are considered. The internal ''stress'' is originated by the presence of defects. The defects are described ... More
A conditional likelihood is required to estimate the selection coefficient in ancient DNAJun 20 2016Jul 11 2016Time-series of allele frequencies are a useful and unique set of data to determine the strength of natural selection on the background of genetic drift. Technically, the selection coefficient is estimated by means of a likelihood function built under ... More
Compact Tetraquark Interpretation of the XYZ StatesDec 14 2015The past decade witnessed the observation of several exotic charmonium-like resonances, some of which are manifestly non-qqbar mesons. We review one of the most popular interpretations of such states: the compact tetraquark in the constituent diquark-antidiquark ... More
New signatures and limits on R-parity violation from resonant squark productionJan 14 2016May 06 2016We discuss resonant squark production at the LHC via baryonic $R$-parity violating interactions. The cross section easily exceeds pair-production and a new set of signatures can be used to probe squarks, particularly stops. These include dijet resonances, ... More
On the cohomology and the Chow ring of the classifying space of PGL_pMay 03 2005Jul 03 2005We investigate the integral cohomology ring and the Chow ring of the classifying space of the complex projective linear group PGL_p, when p is an odd prime. In particular, we determine its additive structure completely, and we reduce the problem of determing ... More
An application of the modular method and the symplectic argument to a Lebesgue-Nagell equationNov 25 2018In this paper, we study the generalized Lebesgue-Nagell equation \[ x^2+7^{2k+1}=y^n. \] This is the last case of equations of the form $x^2+q^{2k+1}=y^n$ with $k\geq0$ and $q>0$ where $\mathbb{Q}(\sqrt{-q})$ has class number one. Our proof is based on ... More
Weak and strong mean-field limits for stochastic Cucker-Smale particle systemsMay 07 2019We consider a particle system with a mean-field-type interaction perturbed by some common and individual noises. When the interacting kernels are sublinear and only locally Lipschitz-continuous, relying on arguments regarding the tightness of random measures ... More
Local picture and level-set percolation of the Gaussian free field on a large discrete torusJul 19 2017Nov 29 2018For $d \geq 3$ we obtain an approximation of the zero-average Gaussian free field on the discrete $d$-dimensional torus of large side length $N$ by the Gaussian free field on $\mathbb Z^d$, valid in boxes of roughly side length $N - N^\delta$ with $\delta ... More
Stability and area law for rapidly mixing quantum dissipative systemsMar 24 2017In this thesis we study properties of open quantum dissipative evolutions of spin systems on lattices described by Lindblad generators, in a particular regime that we denote rapid mixing. We consider dissipative evolutions with a unique fixed point, and ... More
Low-energy R-parity violating SUSY with horizontal flavor symmetriesSep 29 2013In this talk, I will present the general structure of RPV couplings when a Froggatt-Nielsen horizontal symmetry is responsible for the flavor structure of both the SM and the MSSM. For sub-TeV ({\it natural}) SUSY, lepton number must be an accidental ... More
A search for time-integrated CP violation in $D^{0} \rightarrow h^{-}h^{+}$ decaysOct 31 2012Nov 05 2012The LHCb Collaboration has recently observed evidence of CP violation in neutral D meson decays. CP violation in the charm sector is generically expected to be very small in the Standard Model, but can be enhanced in many models of new physics. In this ... More
Einstein, Levi-Civita, and Bianchi relationsFeb 27 2007About an essential suggestion to Einstein by Levi-Civita in 1915. Unicuique suum.
GW's towards fundamental principles of GRSep 04 2007The physical non-existence of gravitational waves (GW's) as a consequence of the non-existence in general relativity (GR) of physically privileged reference frames, and of the ``plasticity'' of relativistic notion of a coordinate system.
Computing all elliptic curves over an arbitrary number field with prescribed primes of bad reductionNov 16 2015In this paper we study the problem of how to determine all elliptic curves defined over an arbitrary number field $K$ with good reduction outside a given finite set of primes $S$ of $K$ by solving $S$-unit equations. We give examples of elliptic curves ... More
The strained state cosmologyOct 03 2015Starting from some relevant facts concerning the behaviour of the universe over large scale and time span, the analogy between the geometric approach of General Relativ- ity and the classical description of an elastic strained material continuum is discussed. ... More
The use of low temperature detectors for direct measurements of the mass of the electron neutrinoNov 03 2015Recent years have witnessed many exciting breakthroughs in neutrino physics. The detection of neutrino oscillations has proved that neutrinos are massive particles but the assessment of their absolute mass scale is still an outstanding challenge in today ... More
Where telescopes cannot (yet) see - the Moon as seen by Scriven Bolton, Etienne Trouvelot, Lucien Rudaux, Chesley BonestellMar 15 2017Scientific illustrations, thanks to the vision of great artists fascinated by astronomical research and astronautics, have provided us with an accurate depiction of the possible views which mankind will one day observed from locations other than our planet. ... More
Natural, R-parity violating supersymmetry and horizontal flavor symmetriesMay 13 2013Aug 06 2013The absence so far of any supersymmetric signals at the LHC pushes towards a rethinking of the assumptions underlying the MSSM. Because the large missing $E_T$ searches are inadequate to detect a LSP decaying within the detector, R-parity violating supersymmetry ... More
Einsteinian Manifolds and Gravitational WavesNov 24 2007The full relativity of the concepts of motion and rest, which is characteristic of the Einsteinian general relativity (GR), does not allow the generation of physical gravitational waves (GW's). -- The undulatory nature of a metric tensor is not an invariant ... More
Coherent quantum transport in a star graphSep 04 2011A multi-branch quantum circuit is considered from the viewpoint of coherent electron or wave transport. Starting with the closed system, we give analytical conditions for the appearance of two isolated localized states out of the energy band. In the open ... More
Precise Propagation of Upper and Lower Probability Bounds in System PMar 07 2000In this paper we consider the inference rules of System P in the framework of coherent imprecise probabilistic assessments. Exploiting our algorithms, we propagate the lower and upper probability bounds associated with the conditional assertions of a ... More
On the minimal compactification of a polynomial in two variablesApr 08 1999Aug 02 1999Consider a primitive polynomial $f$ in two variables, thought of as a map from the affine plane to the affine line. We study the minimimal compactification of $f$; from our result one deduces in particular that if one of the fibers of $f$ has only one ... More
Study of the ultrametric structure of Finite Dimensional Spin Glasses throught a constrained Monte Carlo dynamicsApr 07 1997We report a very detailed relation about the study, by a constrained Monte Carlo dynamic, of a 4D EA spin glass model (J=+/- 1). In particular we concentrate our attention on the behaviour of the system under different bounds imposed in order to optimize ... More
A Cameron and Erdös conjecture on counting primitive setsNov 22 2017Let $f(n)$ count the number of subsets of $\{1,...,n\}$ without an element dividing another. In this paper I show that $f(n)$ grows like the $n$-th power of some real number, in the sense that $\lim_{n\rightarrow \infty}f(n)^{1/n}$ exists. This confirms ... More
Is time enough in order to know where you are?Dec 25 2012This talk discusses various aspects of the structure of space-time presenting mechanisms leading to the explanation of the "rigidity" of the manifold and to the emergence of time, i.e. of the Lorentzian signature. The proposed ingredient is the analog, ... More
The Strained State CosmologySep 13 2011The chapter expounds a theory based on the interpretation of the dark energy as a strain energy of a physical continuum. The theory is based on the analogy that exists between the properties of space-time and the properties of elastic materials, when ... More
On Gravitational MotionsApr 24 2008A new proof of the geodesic character of all motions of bodies that interact only gravitationally - and a detailed illustration of the real meaning of the linearized approximation of general relativity.
Using Stereoscopic 3D Technologies for the Diagnosis and Treatment of Amblyopia in ChildrenSep 28 2011The 3D4Amb project aims at developing a system based on the stereoscopic 3D techonlogy, like the NVIDIA 3D Vision, for the diagnosis and treatment of amblyopia in young children. It exploits the active shutter technology to provide binocular vision, i.e. ... More
Notes on Grothendieck topologies, fibered categories and descent theoryDec 28 2004May 24 2007This is an introduction to Grothendieck's descent theory, with some stress on the general machinery of fibered categories and stacks.
Primordial Gravitational Waves with LISADec 20 2016Primordial Gravitational Waves are the next target of modern cosmology. They represent a window on the early Universe and the only probe of the physics and microphysics of the inflationary period. When the production of GWs happens in scenarios richer ... More
The unsustainable legacy of the Nuclear AgeOct 23 2018It is seldom acknowledged the tremendous burden that the Nuclear Age leaves on future generations, and the environment, for an extremely long time. Nuclear processes, and products, are activated at energies millions of times higher than the energies of ... More
Dark angular momentum of the galaxySep 21 2018This paper proposes a strategy for detecting the presence of a gravito-magnetic field due to the rotation of the galactic dark halo. Visible matter in galaxies rotates and dark matter, supposed to form a halo incorporating barionic matter, rotates also, ... More
The revolution in physics of the early Nineteenth century revisited in the context of science-and-society interactionFeb 07 2018The radical changes in the concepts and approach in Physics at the turn of the Nineteenth century were so deep, that is acknowledged as a revolution. However, in 1970 Thomas Kuhn's careful reconstruction of the researches on the black body problem, the ... More
Pushing the Limits of Exoplanet Discovery via Direct Imaging with Deep LearningApr 12 2019Further advances in exoplanet detection and characterisation require sampling a diverse population of extrasolar planets. One technique to detect these distant worlds is through the direct detection of their thermal emission. The so-called direct imaging ... More
Pomerons and BCFW recursion relations for strings on D-branesSep 20 2010Dec 26 2010We derive pomeron vertex operators for bosonic strings and superstrings in the presence of D-branes. We demonstrate how they can be used in order to compute the Regge behavior of string amplitudes on D-branes and the amplitude of ultrarelativistic D-brane ... More
Network Coding-Based Cooperative ARQ SchemeJan 23 2012In this paper we introduce a novel Automatic Repeat reQuest (ARQ) scheme for cooperative wireless networks. Our scheme adopts network coding techniques in order to enhance the total bandwidth of the network by minimizing the total number of transmissions. ... More
Deflation and Certified Isolation of Singular Zeros of Polynomial SystemsJan 17 2011We develop a new symbolic-numeric algorithm for the certification of singular isolated points, using their associated local ring structure and certified numerical computations. An improvement of an existing method to compute inverse systems is presented, ... More
Bounds on Collapse Models from Matter-Wave Interferometry: Calculational detailsJan 12 2016We present a simple derivation of the interference pattern in matter-wave interferometry as predicted by a class of master equations, by using the density matrix formalism. We apply the obtained formulae to the most relevant collapse models, namely the ... More
Parallel and Distributed Simulation: Five W's (and One H)May 02 2011May 03 2011A well known golden rule of journalism (and many other fields too) is that if you want to know the full story about something you have to answer all the five W's (Who, What, When, Where, Why) and the H (How). This extended abstract is about what is missing ... More
An Economic Bubble Model and Its First Passage TimeMar 21 2018We introduce a new diffusion process Xt to describe asset prices within an economic bubble cycle. The main feature of the process, which differs from existing models, is the drift term where a mean-reversion is taken based on an exponential decay of the ... More
Finite-dimensional representations of hyper multicurrent and multiloop algebrasMay 12 2019We investigate the categories of finite-dimensional representations of multicurrent and multiloop hyperalgebras in positive characteristic, i.e., the hyperalgebras associated to the multicurrent algebras $\mathfrak g\otimes\mathbb{C}[t_1,\ldots,t_n]$ ... More
On weakening tightness to weak tightnessJan 15 2019The weak tightness $wt(X)$ of a space $X$ was introduced in [11] with the property $wt(X)\leq t(X)$. We investigate several well-known results concerning $t(X)$ and consider whether they extend to the weak tightness setting. First we give an example of ... More
A note on rank 2 diagonalsNov 06 2018We solve two questions regarding spaces with a ($G_\delta$)-diagonal of rank 2. One is a question of Basile, Bella and Ridderbos regarding weakly Lindel\"of spaces with a $G_\delta$-diagonal of rank 2 and the other is a question of Arhangel'skii and Bella ... More
The Observational Signatures of Supermassive Black Hole SeedsSep 04 2018The origin and properties of the initial black hole seeds that grow to produce the observed population of accreting sources remain to be determined. It is a challenge to uniquely disentangle signatures of seeding from fueling and dynamics that shapes ... More
Anti-correlation between multiplicity and orbital properties in exoplanetary systems as a possible record of their dynamical historiesAug 31 2017Previous works focused on exoplanets discovered with the radial velocity (RV) method reported an anti-correlation between the orbital eccentricities of the exoplanets and the multiplicity M (i.e., number of planets) of their system. We further investigate ... More
Computer simulations of melts of randomly branching polymersOct 10 2016Randomly branching polymers with {\em annealed} connectivity are model systems for ring polymers and chromosomes. In this context, the branched structure represents transient folding induced by topological constraints. Here we present computer simulations ... More
Mechanism of membrane tube formation induced by adhesive nanocomponentsJun 15 2012We report numerical simulations of membrane tubulation driven by large colloidal particles. Using Monte Carlo simulations we study how the process depends on particle size, concentration and binding strength, and present accurate free energy calculations ... More
Functional Lagrange formalism for time-non-local LagrangiansDec 12 2011Dec 21 2011We develop a time-non-local (TNL) formalism based on variational calculus, which allows for the analysis of TNL Lagrangians. We derive the generalized Euler-Lagrange equations starting from the Hamilton's principle and, by defining a generalized momentum, ... More
Free Energy of Multiple Overlapping ChainsNov 16 2011How accurate is pair additivity in describing interactions between soft polymer-based nanoparticles? Using numerical simulations we compute the free energy cost required to overlap multiple chains in the same region of space, and provide a quantitative ... More
Precision Measurement of CP Violation in D0->pi+pi- at CDFNov 22 2010Dec 09 2010We report a preliminary measurement of the CP violating asymmetry in D0->pi+pi- using approximately 215,000 decays reconstructed in about 5.94/fb of CDF data. We use the strong D*+->D0pi+ decay ("D* tag") to identify the flavor of the charmed meson at ... More
Stacks of trigonal curvesMar 05 2009Apr 16 2010In this paper we give a presentation of the stack of trigonal curves as a quotient stack, and we compute its Picard group.
Searching for New Physics through Charm at CDFMay 16 2011We report a search for non-Standard Model physics through the measurement of CP-violating asymmetry in the Cabibbo suppressed D0->pi+pi- and D0->K+K- decays reconstructed in about 5.94/fb of CDF data. We use the strong D*+->D0pi+ decay ("D* tag") to identify ... More
From Elastic Continua to Space-timeNov 17 2009Since the early days of the theory of electromagnetism and of gravity the idea of space, then space-time, as a sort of physical continuum hovered the scientific community. Actually general relativity shows the strong similarity that exists between the ... More
On the Electromagnetic Properties of Matter in Collapse ModelsAug 24 2009Nov 04 2009We discuss the electromagnetic properties of both a charged free particle, and a charged particle bounded by an harmonic potential, within collapse models. By choosing a particularly simple, yet physically relevant, collapse model, and under only the ... More
On the irreducibility of secant cones, and an application to linear normalityNov 13 2001Let $Y \subset \P^r$ be a normal nondegenerate m-dimensional subvariety and let $\sigma(Y)$ denote the maximum dimension of a subvariety $Z \subset Y_{smooth}$ such that $Z$ contains a generic point of some divisor on $Y$ and the tangent planes $T_y Y$ ... More
Attraction and repulsion in spacetime of an electrically charged mass-pointJul 16 2009By virtue of Hilbert repulsive effect, the most external singular surface of Reissner-Weyl-Nordstroem metric represents an insuperable barrier for the arriving neutral particles and light rays.
Non-Markovian quantum trajectories: an exact resultJul 09 2009Jul 30 2009We analyze the non-Markovian stochastic Schroedinger equation describing a particle subject to spontaneous collapses in space (in the language of collapse models), or subject to a continuous measurement of its position (in the language of continuous quantum ... More
On Hilbert's gravitational repulsion (A historical Note)Apr 09 2009In the literature on general relativity no mention is made of a remarkable result contained in Hilbert's memoir "Die Grundlagen der Physik", according to which in particular instances and in particular regions the Einsteinian gravity exerts a repulsive ... More
Low-resolution measurements induced classicalitySep 26 2008The classical limit of quantum mechanics is discussed for closed quantum systems in terms of observational aspects. Initially, the failure of the limit h->0 is explicitly demonstrated in a model of two quantum mechanically interacting oscillators by showing ... More
Gravitational collapses to bodies of a finite volumeDec 16 2006We prove with an exact relativistic computation that the spherosymmetric gravitational collapses with a time-dependent pressure end in bodies with a small, but finite volume. Against a diffuse, wrong conviction.
Higher algebraic K-theory for actions of diagonalizable groupsJul 24 2001Sep 17 2004We study the K-theory of actions of diagonalizable group schemes on noetherian regular separated algebraic spaces: our main result shows how to reconstruct the K-theory ring of such an action from the K-theory rings of the loci where the stabilizers have ... More
About the Notion of Truth in the Decoherent Histories Approach: a reply to GriffithsDec 13 1999Griffiths claims that the ``single family rule'', a basic postulate of the decoherent histories approach, rules out our requirement that any decoherent history has a unique truth value, independently from the decoherent family to which it may belong. ... More
Cardinal Invariants for the $G_δ$ topologyJul 16 2017We prove upper bounds for the spread, the Lindel\"of number and the weak Lindel\"of number of the $G_\delta$-topology on a topological space and apply a few of our bounds to give a short proof to a recent result of Juh\'asz and van Mill regarding the ... More
Bounds on Collapse Models from Matter-Wave Interferometry: Calculational detailsJan 12 2016May 31 2017We present a simple derivation of the interference pattern in matter-wave interferometry as predicted by a class of master equations, by using the density matrix formalism. We apply the obtained formulae to the most relevant collapse models, namely the ... More
Ride Sharing with a Vehicle of Unlimited CapacityJul 09 2015Jun 09 2016A ride sharing problem is considered where we are given a graph, whose edges are equipped with a travel cost, plus a set of objects, each associated with a transportation request given by a pair of origin and destination nodes. A vehicle travels through ... More
The motivic class of the classifying stack of the special orthogonal groupSep 26 2016Jul 05 2017We compute the class of the classifying stack of the special orthogonal group in the Grothendieck ring of stacks, and check that it is equal to the multiplicative inverse of the class of the group.
Frictionally decaying frontal warm-core eddiesJul 06 2016The dynamics of nonstationary, nonlinear, axisymmetric, warm-core geophysical surface frontal vortices affected by Rayleigh friction is investigated semi-analytically using the nonlinear, nonstationary reduced-gravity shallow-water equations. In this ... More
The Chow Ring of the Stack of Smooth Plane CubicsJun 20 2016Jan 14 2018We give an explicit presentation of the integral Chow ring of a stack of smooth plane cubics. We also determine some relations in the general case of hypersurfaces of any dimension and degree.
Dissipative Continuous Spontaneous Localization (CSL) modelAug 27 2014Aug 06 2015Collapse models explain the absence of quantum superpositions at the macroscopic scale, while giving practically the same predictions as quantum mechanics for microscopic systems. The Continuous Spontaneous Localization (CSL) model is the most refined ... More
Quasi Conjunction, Quasi Disjunction, T-norms and T-conorms: Probabilistic AspectsMar 20 2013We make a probabilistic analysis related to some inference rules which play an important role in nonmonotonic reasoning. In a coherence-based setting, we study the extensions of a probability assessment defined on $n$ conditional events to their quasi ... More
DBKGrad: An R Package for Mortality Rates Graduation by Fixed and Adaptive Discrete Beta Kernel TechniquesNov 06 2012Kernel smoothing represents a useful approach in the graduation of mortality rates. Though there exist several options for performing kernel smoothing in statistical software packages, there have been very few contributions to date that have focused on ... More
Fundamental gerbesOct 24 2016Jun 20 2017For a class of affine algebraic groups $\mathcal C$ over a field, we define the notions of $\mathcal C$-fundamental gerbe of a fibered category, generalizing what we had done in arXiv:1204.1260 for finite group schemes. We give sufficient conditions on ... More
The Nori fundamental gerbe of a fibered categoryApr 05 2012Dec 23 2012We give a condition that ensures that a fibered category over a field admits a universal morphism to a profinite gerbe. This fundamental gerbe generalizes both Nori's fundamental group scheme and Deligne's relative fundamental groupoid. Using a simplified ... More
Wayne - A Simulator for HST WFC3 IR Grism SpectroscopyNov 29 2015Aug 22 2017Wayne is an algorithm that simulates Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) grism spectroscopic frames including sources of noise and systematics. It can simulate both staring and spatial scan modes, and observations such as the transit ... More
Spin equilibrium in strongly-magnetized accreting starsSep 27 2016The spin rate of a strongly-magnetized accreting star is regulated by the interaction between the star's magnetic field and the accreting gas. These systems are often hypothesized to be in `spin equilibrium' with their surrounding accretion flows such ... More
Ecological Modelling with the Calculus of Wrapped CompartmentsMay 08 2015The Calculus of Wrapped Compartments is a framework based on stochastic multiset rewriting in a compartmentalised setting originally developed for the modelling and analysis of biological interactions. In this paper, we propose to use this calculus for ... More
Augmented base loci and restricted volumes on normal varieties, II: The case of real divisorsMay 27 2014Let $X$ be a normal projective variety defined over an algebraically closed field and let $Z$ be a subvariety. Let $D$ be an $\mathbb R$-Cartier $\mathbb R$-divisor on $X$. Given an expression $(\ast) \ D \sim_{\mathbb R} t_1 H_1 + \ldots + t_s H_s$ with ... More
Knowledge Integration for Conditional Probability AssessmentsMar 13 2013In the probabilistic approach to uncertainty management the input knowledge is usually represented by means of some probability distributions. In this paper we assume that the input knowledge is given by two discrete conditional probability distributions, ... More
CP Violation in charm decays at CDFAug 13 2012Exploiting the full Run II data sample collected by the CDF trigger on displaced vertices, we present a search for CP violation in neutral D mesons decays to hadronic final states. We use the strong D^{*+}\to D^{0}\pi^{+} (and c.c.) decay to identify ... More
Finite-dimensional representations of twisted hyper loop algebrasMay 18 2012We investigate the category of finite-dimensional representations of twisted hyper loop algebras, i.e., the hyperalgebras associated to twisted loop algebras over finite-dimensional simple Lie algebras. The main results are the classification of the irreducible ... More
Conditional Random Quantities and Compounds of ConditionalsApr 17 2013In this paper we consider finite conditional random quantities and conditional previsions assessments in the setting of coherence. We use a suitable representation for conditional random quantities; in particular the indicator of a conditional event $E|H$ ... More
Some conjectures in elementary number theoryFeb 21 2013We announce a number of conjectures associated with and arising from a study of primes and irrationals in $\mathbb{R}$. All are supported by numerical verification to the extent possible.
A note on Sturm-Liouville problems whose spectrum is the set of prime numbersAug 09 2011Aug 29 2011We show that there is no classical regular Sturm-Liouville problem on a finite interval whose spectrum consists of infinitely many distinct primes numbers. In particular, this answers in the negative a question raised by Zettl in his book on Sturm-Liouville ... More
A survey of the regular weighted Sturm-Liouville problem - The non-definite caseJun 29 2011This is a survey of the non-definite Sturm-Liouville problem from its inception in the early 1900's until 1986.