Results for "Pietro Liò"

total 1695took 0.11s
Modelling trait dependent speciation with Approximate Bayesian ComputationDec 10 2018Phylogeny is the field of modelling the temporal discrete dynamics of speciation. Complex models can nowadays be studied using the Approximate Bayesian Computation approach which avoids likelihood calculations. The field's progression is hampered by the ... More
Automatic Inference of Cross-modal Connection Topologies for X-CNNsMay 02 2018This paper introduces a way to learn cross-modal convolutional neural network (X-CNN) architectures from a base convolutional network (CNN) and the training data to reduce the design cost and enable applying cross-modal networks in sparse data environments. ... More
Introducing Curvature to the Label SpaceOct 22 2018One-hot encoding is a labelling system that embeds classes as standard basis vectors in a label space. Despite seeing near-universal use in supervised categorical classification tasks, the scheme is problematic in its geometric implication that, as all ... More
On Graph Classification Networks, Datasets and BaselinesMay 12 2019Graph classification receives a great deal of attention from the non-Euclidean machine learning community. Recent advances in graph coarsening have enabled the training of deeper networks and produced new state-of-the-art results in many benchmark tasks. ... More
XFlow: 1D-2D Cross-modal Deep Neural Networks for Audiovisual ClassificationSep 02 2017We propose two multimodal deep learning architectures that allow for cross-modal dataflow (XFlow) between the feature extractors, thereby extracting more interpretable features and obtaining a better representation than through unimodal learning, for ... More
Disease processes as hybrid dynamical systemsAug 19 2012We investigate the use of hybrid techniques in complex processes of infectious diseases. Since predictive disease models in biomedicine require a multiscale approach for understanding the molecule-cell-tissue-organ-body interactions, heterogeneous methodologies ... More
Multiple verification in computational modeling of bone pathologiesSep 07 2011We introduce a model checking approach to diagnose the emerging of bone pathologies. The implementation of a new model of bone remodeling in PRISM has led to an interesting characterization of osteoporosis as a defective bone remodeling dynamics with ... More
Quantifying the Effects of Enforcing Disentanglement on Variational AutoencodersNov 24 2017The notion of disentangled autoencoders was proposed as an extension to the variational autoencoder by introducing a disentanglement parameter $\beta$, controlling the learning pressure put on the possible underlying latent representations. For certain ... More
XFlow: Cross-modal Deep Neural Networks for Audiovisual ClassificationSep 02 2017Apr 12 2019In recent years, there have been numerous developments towards solving multimodal tasks, aiming to learn a stronger representation than through a single modality. Certain aspects of the data can be particularly useful in this case - for example, correlations ... More
Applications of molecular communications to medicine: a surveyAug 13 2018In recent years, progresses in nanotechnology have established the foundations for implementing nanomachines capable of carrying out simple but significant tasks. Under this stimulus, researchers have been proposing various solutions for realizing nanoscale ... More
ChronoMID - Cross-Modal Neural Networks for 3-D Temporal Medical Imaging DataJan 12 2019ChronoMID builds on the success of cross-modal convolutional neural networks (X-CNNs), making the novel application of the technique to medical imaging data. Specifically, this paper presents and compares alternative approaches - timestamps and difference ... More
ncRNA Classification with Graph Convolutional NetworksMay 16 2019Non-coding RNA (ncRNA) are RNA sequences which don't code for a gene but instead carry important biological functions. The task of ncRNA classification consists in classifying a given ncRNA sequence into its family. While it has been shown that the graph ... More
StochKit-FF: Efficient Systems Biology on Multicore ArchitecturesJul 11 2010The stochastic modelling of biological systems is an informative, and in some cases, very adequate technique, which may however result in being more expensive than other modelling approaches, such as differential equations. We present StochKit-FF, a parallel ... More
Towards Sparse Hierarchical Graph ClassifiersNov 03 2018Recent advances in representation learning on graphs, mainly leveraging graph convolutional networks, have brought a substantial improvement on many graph-based benchmark tasks. While novel approaches to learning node embeddings are highly suitable for ... More
X-CNN: Cross-modal Convolutional Neural Networks for Sparse DatasetsOct 01 2016In this paper we propose cross-modal convolutional neural networks (X-CNNs), a novel biologically inspired type of CNN architectures, treating gradient descent-specialised CNNs as individual units of processing in a larger-scale network topology, while ... More
X-CNN: Cross-modal Convolutional Neural Networks for Sparse DatasetsOct 01 2016Oct 17 2016In this paper we propose cross-modal convolutional neural networks (X-CNNs), a novel biologically inspired type of CNN architectures, treating gradient descent-specialised CNNs as individual units of processing in a larger-scale network topology, while ... More
Structure-Based Networks for Drug ValidationNov 21 2018Classifying chemicals according to putative modes of action (MOAs) is of paramount importance in the context of risk assessment. However, current methods are only able to handle a very small proportion of the existing chemicals. We address this issue ... More
Deep Graph InfomaxSep 27 2018Dec 21 2018We present Deep Graph Infomax (DGI), a general approach for learning node representations within graph-structured data in an unsupervised manner. DGI relies on maximizing mutual information between patch representations and corresponding high-level summaries ... More
Drug-Drug Adverse Effect Prediction with Graph Co-AttentionMay 02 2019Complex or co-existing diseases are commonly treated using drug combinations, which can lead to higher risk of adverse side effects. The detection of polypharmacy side effects is usually done in Phase IV clinical trials, but there are still plenty which ... More
Graph Attention NetworksOct 30 2017Feb 04 2018We present graph attention networks (GATs), novel neural network architectures that operate on graph-structured data, leveraging masked self-attentional layers to address the shortcomings of prior methods based on graph convolutions or their approximations. ... More
Estimation and Modelling of PCBs Bioaccumulation in the Adriatic Sea EcosystemMay 25 2014Persistent Organic Pollutants represent a global ecological concern due to their ability to accumulate in organisms and to spread species-by-species via feeding connections. In this work we focus on the estimation and simulation of the bioaccumulation ... More
Spatio-Temporal Deep Graph InfomaxApr 12 2019Spatio-temporal graphs such as traffic networks or gene regulatory systems present challenges for the existing deep learning methods due to the complexity of structural changes over time. To address these issues, we introduce Spatio-Temporal Deep Graph ... More
Cross-modal Recurrent Models for Weight Objective Prediction from Multimodal Time-series DataSep 23 2017Nov 29 2017We analyse multimodal time-series data corresponding to weight, sleep and steps measurements. We focus on predicting whether a user will successfully achieve his/her weight objective. For this, we design several deep long short-term memory (LSTM) architectures, ... More
GenHap: A Novel Computational Method Based on Genetic Algorithms for Haplotype AssemblyDec 18 2018The computational problem of inferring the full haplotype of a cell starting from read sequencing data is known as haplotype assembly, and consists in assigning all heterozygous Single Nucleotide Polymorphisms (SNPs) to exactly one of the two chromosomes. ... More
Constraints on R-Parity violating stop couplings from flavor physicsAug 25 2000Nov 22 2000We perform a critical reassessment of the constraints on the R-parity and baryon number violating (s)top couplings coming from flavor physics. In particular, we study K0-K0bar mixing, including QCD corrections and a class of diagrams that were neglected ... More
Spectrally Perron Polynomials and the Cauchy-Ostrovsky TheoremAug 26 2016Oct 23 2016In this note, proofs of theorems attributed to Cauchy and Ostrovsky via combinatorial matrix theory and nonnegative matrix theory are given. We show that the sufficient conditions in each theorem are also necessary. In addition, we introduce the notion ... More
Supersymmetry and First Order Equations for Extremal States: Monopoles, Hyperinstantons, Black-Holes and p-BranesJan 13 1997Jan 16 1997In this lecture I review recent results on the first order equations describing BPS extremal states, in particular N=2 extremal black-holes. The role of special geometry is emphasized also in the rigid theory and a comparison is drawn with the supersymmetric ... More
CKM matrix: the `over-consistent' picture of the unitarity triangleNov 21 2000Dec 21 2000In presenting an up-to-date account of the experimental knowledge of the CKM matrix, special emphasis is placed on the exceptional degree of consistency shown by the current Standard Model determination of the unitarity triangle; some implications in ... More
Wall-Crossing Invariants from Spectral NetworksNov 01 2016A new construction of BPS monodromies for 4d ${\mathcal N}=2$ theories of class S is introduced. A novel feature of this construction is its manifest invariance under Kontsevich-Soibelman wall crossing, in the sense that no information on the 4d BPS spectrum ... More
Parameter free calculation of hadronic masses from instantonsNov 25 2001We propose a non-perturbative calculation scheme which is based on the semi-classical approximation of QCD and can be used to evaluate quantities of interest in hadronic physics. As a first application, we evaluate the mass of the pion and of the nucleon. ... More
Comparing the automorphism group of the measure algebra with some groups related to the infinite permutation group of the natural numbersDec 27 2003We prove, by a straight construction, that the automorphism group of the measure algebra and the subgroup of the measure preserving ones cannot be isomorphic to the trivial automorphisms of P(N)/fin.
A Tenth Hilbert Problem-like Result: The Decidability of MLS with Unordered Cartesian ProductFeb 27 2019Using the technique of formative processes, I solve the decidability problem of MLS with unordered cartesian product in the positive. Moreover I give a pure combinatorial description of the satisfiable MLS with unordered cartesian product-formulas for ... More
Representations of Atiyah algebroids and logarithmic connectionsMay 18 2015In this paper, we investigate representations of $\operatorname{At}(N)$, the Atiyah algebroids of a holomorphic line bundles $N$ over a complex manifold $Y$. In particular, we relate $\operatorname{At}(N)$-modules with logarithmic connections through ... More
Classification of deformation quantization algebroids on complex symplectic manifoldsMar 19 2005Dec 21 2005Deformation quantization algebroids over a complex symplectic manifold X are locally given by rings of WKB operators, that is, microdifferential operators with an extra central parameter \tau. In this paper, we will show that such algebroids are classified ... More
Spectrally Perron Polynomials and the Cauchy-Ostrovsky TheoremAug 26 2016Oct 06 2016In this note, proofs of theorems attributed to Cauchy and Ostrovsky via combinatorial matrix theory and nonnegative matrix theory are given. We show that the sufficient conditions in each theorem are also necessary. In addition, we introduce the notion ... More
Rare $B$-Decays and Heavy to Light Semileptonic Transitions in the Isgur and Wise LimitNov 10 1993From the experimental branching ratios for $B^- --> \rho^0 l^-\bar\nu_l$ and $D^+ --> {\overl K}^{*0}({\overl K}^0) e^+ \nu_e$ one finds, in the Heavy Quark Limit of $HQET$, $ |V_{bu}|=(8.1\pm 1.7) x 10^{-3}$, larger but consistent with the actual quoted ... More
Gaugings and other supergravity tools of p-brane physicsFeb 19 2001Apr 01 2001In this series of lectures I present a review of the geometric structures of supergravity in diverse dimensions mostly relevant to p-brane physics and to pinpoint the correspondence between the macroscopic and microscopic description of branes. In particular ... More
The role of diffeomorphisms in the integration over a finite dimensional space of geometriesSep 24 1997Starting from the De Witt supermetric and limiting ourselves to a family of geometries characterized by a finite number of geometric invariants we extract the unique integration measure. Such a measure turns out to be a geometric invariant, i.e. independent ... More
The INTEGRAL - HESS/MAGIC connection: a new class of cosmic high energy accelerators from keV to TeVMay 09 2006The recent completion and operation of the High Energy Stereoscopic System, an array of ground based imaging Cherenkov telescopes, has provided a survey with unprecedented sensitivity of the inner part of the Galaxy and revealed a new population of very ... More
Long distance contributions to the eta_b => Jpsi Jpsi decayMar 21 2007Apr 08 2008It was argued long ago that eta_b could be observed through the eta_b => Jpsi(=> mu+ mu-) Jpsi(=> mu+ mu-) decay chain. Recent calculations indicate that the width of eta_b into two Jpsi is almost 3 orders of magnitude smaller than the one into the D ... More
Critical behavior of frustrated spin systems with nonplanar orderingsMay 13 2003Sep 26 2003The critical behavior of frustrated spin systems with nonplanar orderings is analyzed by a six-loop study in fixed dimension of an effective O$(N) \times $O$(M)$ Landau-Ginzburg-Wilson Hamiltonian. For this purpose the large-order behavior of the field ... More
Two-loop corrections to the Higgs boson masses in the MSSMMay 15 2002We present a computation of the O(at*as + at^2) two--loop corrections to the MSSM Higgs masses. An appropriate use of the effective potential approach allows us to obtain simple analytical formulae, valid for arbitrary values of mA and of the mass parameters ... More
Hyperbolic deformation of the strip-equation and the accessory parameters for the torusJul 01 2013Jul 09 2013By applying an hyperbolic deformation to the uniformization problem for the infinite strip, we give a method for computing the accessory parameter for the torus with one source as an expansion in the modular parameter q. At O(q^0) we obtain the same equation ... More
Complete Residue Systems: A Primer and an ApplicationJun 03 2012Aug 17 2012Complete residue systems play an integral role in abstract algebra and number theory, and a description is typically found in any number theory textbook. This note provides a concise overview of complete residue systems, including a robust definition, ... More
Characterizing downwards closed, strongly first order, relativizable dependenciesSep 01 2018Feb 22 2019In Team Semantics, a dependency notion is strongly first order if every sentence of the logic obtained by adding the corresponding atoms to First Order Logic is equivalent to some first order sentence. In this work it is shown that all nontrivial dependency ... More
Optimal investment and price dependence in a semi-static marketMar 01 2013Oct 08 2013This paper studies the problem of maximizing expected utility from terminal wealth in a semi-static market composed of derivative securities, which we assume can be traded only at time zero, and of stocks, which can be traded continuously in time and ... More
Combinatorial interpretations of particular evaluations of complete and elementary symmetric functionsNov 11 2011The Jacobi-Stirling numbers and the Legendre-Stirling numbers of the first and second kind were first introduced in [6], [7]. In this paper we note that Jacobi-Stirling numbers and Legendre-Stirling numbers are specializations of elementary and complete ... More
Human Computation and ConvergenceMar 19 2015May 06 2015Humans are the most effective integrators and producers of information, directly and through the use of information-processing inventions. As these inventions become increasingly sophisticated, the substantive role of humans in processing information ... More
Periodic solutions of forced Kirchhoff equationsJan 14 2007Jun 14 2007We consider Kirchhoff equations for vibrating bodies in any dimension in presence of a time-periodic external forcing with period 2pi/omega and amplitude epsilon, both for Dirichlet and for space-periodic boundary conditions. We prove existence, regularity ... More
Uniqueness of quantization of complex contact manifoldsDec 21 2005Using the language of algebroid stacks, we will show that Kashiwara's quantization of a complex contact manifold is unique.
An explicit bound for the log-canonical degree of curves on open surfacesJan 08 2019Let $X$, $D$ be a smooth projective surface and a simple normal crossing divisor on $X$, respectively. Suppose $\kappa (X, K_X + D)\ge 0$, let $C$ be an irreducible curve on $X$ whose support is not contained in $D$ and $\alpha$ a rational number in $ ... More
Free Differential Algebras, Rheonomy, and Pure SpinorsJan 20 2008We report on progresses on the derivation of pure spinor constraints, BRST algebra and BRST invariant sigma models a la pure spinors from the algebraic structure of the FDA underlying supergravity.
Constrained Supermanifolds for AdS M-Theory BackgroundsApr 25 2007A long standing problem is the supergauge completion of AdS_4 x (G/H)_7 or AdS_5 x (G/H)_5 backgrounds which preserve less then maximal supersymmetry. In parallel with the supersolvable realization of the AdS_4 x S^7 background based on Kappa-symmetry, ... More
Dynamic Logics of Imperfect Information: from Teams and Games to TransitionsNov 22 2011Dec 15 2011We introduce a new semantical formalism for logics of imperfect information, based on Game Logic (and, in particular, on van Benthem, Ghosh and Lu's Concurrent Dynamic Game Logic). This new kind of semantics combines aspects from game theoretic semantics ... More
Riemann-Hilbert treatment of Liouville theory on the torusOct 24 2010Dec 05 2010We apply a perturbative technique to study classical Liouville theory on the torus. After mapping the problem on the cut-plane we give the perturbative treatment for a weak source. When the torus reduces to the square the problem is exactly soluble by ... More
Recent Results in Charmonium Spectroscopy at B-factoriesSep 14 2010Charmonium spectroscopy gained renewed interest after the discovery in 2003 of the unpredicted X(3872) charmonium-like state, above the $D\overline{D}$ threshold. To date many charmonium-like states above the $D\overline{D}$ threshold have been claimed. ... More
On the semiclassical treatment of Hawking radiationNov 23 2009Sep 19 2010In the context of the semiclassical treatment of Hawking radiation we prove the universality of the reduced canonical momentum for the system of a massive shell self gravitating in a spherical gravitational field within the Painlev\'e family of gauges. ... More
Measurements of Time-Dependent CP Asymmetries in b\to s Penguin Dominated Hadronic B Decays at BaBarSep 26 2009We report measurements of Time-Dependent CP asymmetries in several $b\to s$ penguin dominated hadronic B decays, where New Physics contributions may appear. We find no significant discrepancies with respect to the Standard Model expectations.
Semiclassical and quantum Liouville theoryDec 22 2005We develop a functional integral approach to quantum Liouville field theory completely independent of the hamiltonian approach. To this end on the sphere topology we solve the Riemann-Hilbert problem for three singularities of finite strength and a fourth ... More
BPS D3-branes on smooth ALE manifoldsOct 30 2001In this talk I review the recent construction of a new family of classical BPS solutions of type IIB supergravity describing 3-branes transverse to a 6-dimensional space with topology $\mathbb{R}^{2}\times$ALE. They are characterized by a non-trivial ... More
Solvable Lie Algebras, BPS Black Holes and Supergravity GaugingsFeb 07 1998In this talk I review both accomplished results and work in progress on the use of solvable Lie algebras as an intrinsic algebraic characterization of the scalar field sector of M--theory low energy effective lagrangians. In particular I review the application ... More
Non-Leptonic Two-Body Weak Decays of Charmed Mesons and CP-Violating AsymmetriesAug 06 1996The non-leptonic two body decays of D mesons are studied in the framework of an improved factorization approximation. The final state interaction effects are taken into account assuming them dominated by nearby resonances. The agreement with experimental ... More
Hamiltonian structure of 2+1 dimensional gravityFeb 14 2001A summary is given of some results and perspectives of the hamiltonian ADM approach to 2+1 dimensional gravity. After recalling the classical results for closed universes in absence of matter we go over the the case in which matter is present in the form ... More
Kazhdan-Lusztig polynomials of boolean elementsNov 12 2011We give closed combinatorial product formulas for Kazhdan-Lusztig poynomials and their parabolic analogue of type q in the case of boolean elements, introduced in [M. Marietti, Boolean elements in Kazhdan-Lusztig theory, J. Algebra 295 (2006)], in Coxeter ... More
Investigating Biological Matter with Theoretical Nuclear Physics MethodsAug 25 2011The internal dynamics of strongly interacting systems and that of biomolecules such as proteins display several important analogies, despite the huge difference in their characteristic energy and length scales. For example, in all such systems, collective ... More
Characterizing Strongly First Order Dependencies: The Non-Jumping Relativizable CaseFeb 20 2019Team Semantics generalizes Tarski's Semantics for First Order Logic by allowing formulas to be satisfied or not satisfied by sets of assignments rather than by single assignments. Because of this, in Team Semantics it is possible to extend the language ... More
Computation of Framed Deformation FunctorsNov 16 2012Jan 22 2013In this work we compute the universal framed deformation functor for a reducible Galois representation $\rho$ given by direct sum of 2-dimensional representations $\rho_i$ coming from p-divisible groups. We impose the local conditions of flatness in the ... More
On the $h \to V \ell^+ \ell^-$ decaysOct 05 2016Dec 13 2016A set of exclusive decays of the Higgs boson into a vector meson and a dilepton pair ($h\to V \ell^+ \ell^-$, with $V=\Upsilon, J/\psi,\phi$, and $\ell=\mu, \tau$) are studied in the framework of the Standard Model. We have evaluated the decay rates, ... More
Periodic solutions of fully nonlinear autonomous equations of Benjamin-Ono typeFeb 15 2012Feb 20 2012We prove the existence of time-periodic, small amplitude solutions of autonomous quasilinear or fully nonlinear completely resonant pseudo-PDEs of Benjamin-Ono type in Sobolev class. The result holds for frequencies in a Cantor set that has asymptotically ... More
Transition Semantics - The Dynamics of Dependence LogicMar 05 2012May 21 2013We examine the relationship between Dependence Logic and game logics. A variant of Dynamic Game Logic, called Transition Logic, is developed, and we show that its relationship with Dependence Logic is comparable to the one between First-Order Logic and ... More
$Λ$-modules and holomorphic Lie algebroid connectionsAug 16 2011Mar 21 2012Let $X$ be a complex smooth projective variety, and $\mathcal{G}$ a locally free sheaf on $X$. We show that there is a 1-to-1 correspondence between pairs $(\Lambda,\Xi)$, where $\Lambda$ is a sheaf of almost polynomial filtered algebras over $X$ satisfying ... More
Rational fixed points for linear group actionsOct 23 2006Aug 16 2007Let $k$ be a finitely generated field, let $X$ be an algebraic variety and $G$ a linear algebraic group, both defined over $k$. Suppose $G$ acts on $X$ and every element of a Zariski-dense semigroup $\Gamma \subset G(k)$ has a rational fixed point in ... More
On quantizations of complex contact manifoldsNov 20 2012Dec 31 2014A (holomorphic) quantization of a complex contact manifold is a filtered algebroid stack which is locally equivalent to the ring E of microdifferential operators and which has trivial graded. The existence of a canonical quantization has been proved by ... More
The arithmetical rank of a special class of monomial idealsMay 14 2010Jun 08 2010We give an affirmative answer to a question due to J. He and A. Van Tuyl, proving that the arithmetical rank of a special monomial ideal equals to the projective dimension of corresponding quotient module.
Applications of pathwise Burkholder-Davis-Gundy inequalitiesJul 05 2015We present several applications of the pathwise Burkholder-Davis-Gundy (BDG) inequalities. Most importantly we prove them for cadlag semimartingales and a general function $\Phi$, and use this to derive BDG inequalities (non-pathwise ones) for the Bessel ... More
Accessory parameters for Liouville theory on the torusJul 30 2012Sep 04 2012We give an implicit equation for the accessory parameter on the torus which is the necessary and sufficient condition to obtain the monodromy of the conformal factor. It is shown that the perturbative series for the accessory parameter in the coupling ... More
Eisenstein's criterion, Fermat's last theorem, and a conjecture on powerful numbersApr 05 2017Feb 13 2018Given integers $\ell > m >0$, we define monic polynomials $X_n$, $Y_n$, and $Z_n$ with the property that $\mu$ is a zero of $X_n$ if and only if the triple $(\mu,\mu+m,\mu+\ell)$ satisfies $x^n + y^n = z^n$. It is shown that the irreducibility of these ... More
A note on duality theorems in mass transportationJul 16 2019The duality theory of the Monge-Kantorovich transport problem is investigated in an abstract measure theoretic framework. Let $(\mathcal{X},\mathcal{F},\mu)$ and $(\mathcal{Y},\mathcal{G},\nu)$ be any probability spaces and $c:\mathcal{X}\times\mathcal{Y}\rightarrow\mathbb{R}$ ... More
Pure Spinors, Free Differential Algebras, and the SupermembraneJun 19 2006The lagrangian formalism for the supermembrane in any 11d supergravity background is constructed in the pure spinor framework. Our gauge-fixed action is manifestly BRST, supersymmetric, and 3d Lorentz invariant. The relation between the Free Differential ... More
Group theoretical derivation of Liouville action for Regge surfacesJul 10 1997We show that the structure of the Liouville action on a two dimensional Regge surface of the topology of the sphere and of the torus is determined by the invariance under the transformations induced by the conformal Killing vector fields and under modular ... More
U Duality, Solvable Lie Algebras and Extremal Black-HolesFeb 24 1997In this lecture I review recent results on the use of Solvable Lie Algebras as an efficient description of the scalar field sector of supergravities in relation with their non perturbative structure encoded in the U-duality group. I also review recent ... More
The BPS Spectrum Generator In 2d-4d SystemsMay 11 2012Oct 28 2012We apply the techniques provided by the recent works Gaiotto, Moore and Neitzke, to derive the most general spectrum generating functions for coupled 2d-4d $A_1$ theories of class ${\cal S}$, in presence of surface and line defects. As an application ... More
Period Matrices of Real Riemann Surfaces and Fundamental DomainsFeb 16 2012Oct 22 2013For some positive integers $g$ and $n$ we consider a subgroup $\mathbb{G}_{g,n}$ of the $2g$-dimensional modular group keeping invariant a certain locus $\mathcal{W}_{g,n}$ in the Siegel upper half plane of degree $g$. We address the problem of describing ... More
Late-time expansion in the semiclassical theory of the Hawking radiationJul 17 2011Sep 07 2011We give a detailed treatment of the back-reaction effects on the Hawking spectrum in the late-time expansion within the semiclassical approach to the Hawking radiation. We find that the boundary value problem defining the action of the modes which are ... More
Do arbitrage-free prices come from utility maximization?Jul 19 2012Oct 22 2013In this paper we ask whether, given a stock market and an illiquid derivative, there exists arbitrage-free prices at which an utility-maximizing agent would always want to buy the derivative, irrespectively of his own initial endowment of derivatives ... More
A general proof system for logics of imperfect informationJan 27 2012We develop a semantics for logics of imperfect information with respect to general models. Then we build a proof system and prove its soundness and completeness with respect to this semantics.
A generalized small model property for languages which force the infinityNov 10 2004Dec 30 2004This paper deals with formulas of set theory which force the infinity. For such formulas, we provide a technique to infer satisfiability from a finite assignment.
Optimal Investment with Stocks and DerivativesOct 19 2012Oct 08 2013This paper studies the problem of maximizing expected utility from terminal wealth combining a static position in derivative securities, which we assume can be traded only at time zero, with a traditional dynamic trading strategy in stocks. We work in ... More
Indirect constraints on R-parity violating stop couplingsMar 31 2000Aug 04 2000It was recently claimed that single stop production at the Tevatron, occurring via R-parity (and baryon number) violating couplings, could lead to observable signals. In this talk I present some results of a work in progress, showing that rare B decays ... More
QCD Sum Rule Analysis of B \to (K,K^*) (\ell^+\ell^-,ν\barν) DecaysNov 15 1997We use three-point QCD sum rules to calculate the form factors governing the rare exclusive decays B \to (K,K^*) \ell^+ \ell^-, B \to (K,K^*) \nu \bar\nu. We predict the branching ratios, the invariant mass distributions of the lepton pair for B \to (K,K^*) ... More
The Complete Form of N=2 Supergravity and its Place in the General Framework of D=4 N--Extended SupergravitiesNov 22 1996Relying on the geometrical set up of Special K\"ahler Geometry and Quaternionic Geometry, which I discussed at length in my Lectures at the 1995 edition of this Spring School, I present here the recently obtained fully general form of N=2 supergravity ... More
Lectures on Special Kahler Geometry and Electric--Magnetic Duality RotationsDec 06 1995In these lectures I review the general structure of electric--magnetic duality rotations in every even space--time dimension. In four dimensions, which is my main concern, I discuss the general issue of symplectic covariance and how it relates to the ... More
Gravity in 2+1 dimensionsDec 06 1994A review is given of some classical and quantum aspects of 2+1 dimensional gravity.
Molecular Dynamics at Low Time ResolutionJun 25 2010The internal dynamics of macro-molecular systems is characterized by widely separated time scales, ranging from fraction of ps to ns. In ordinary molecular dynamics simulations, the elementary time step dt used to integrate the equation of motion needs ... More
Nonlinear Boltzmann equation for the homogeneous isotropic case: Minimal deterministic Matlab programApr 20 2010The homogeneous isotropic Boltzmann equation (HIBE) is a fundamental dynamic model for many applications in thermodynamics, econophysics and sociodynamics. Despite recent hardware improvements, the solution of the Boltzmann equation remains extremely ... More
CP Violation Results from B Decays at BaBarFeb 07 2011In the present paper we review recent experimental results from the BaBar experiment concerning the measurement of the CKM angles. A particular highlight is given to the novel independent determination of the angle alpha from B0 -> a_1(1260)+/- pi -/+ ... More
On the eta(b) => J/psi J/psi decayDec 21 2007It has been argued long ago that eta(b) could be observed through the eta(b) => J/psi(=> mu+ mu-) J/psi(=> mu+ mu-) decay chain. Recent calculations indicate that the width of eta(b) into two J/psi is almost three order of magnitude smaller than the one ... More
M-theory FDA, Twisted Tori and Chevalley CohomologyOct 09 2005Oct 18 2005The FDA algebras emerging from twisted tori compactifications of M-theory with fluxes are discussed within the general classification scheme provided by Sullivan's theorems and by Chevalley cohomology. It is shown that the generalized Maurer Cartan equations ... More
Instanton-Induced Correlations in HadronsNov 05 2004Dec 23 2004QCD instantons generate non-perturbative spin- and flavor- dependent forces between quarks. We review the results of a series of studies on instanton-induced correlations in hadrons. We first present some evidence for instanton-mediated interactions in ... More
Strong CP breaking and quark-antiquark repulsion in QCD, at finite thetaApr 16 2004May 05 2005This work is devoted to the study of the CP-breaking dynamics in QCD, at finite theta-angle. By working in the semi-classical limit, in which the topology of the vacuum is clustered around instantons and anti-instantons, we show that quantum fluctuations ... More