Results for "Diego Matessi"

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Lagrangian pairs of pantsFeb 08 2018We construct a Lagrangian submanifold, inside the cotangent bundle of a real torus, which we call a Lagrangian pair of pants. It is given as the graph of the differential of a smooth function defined on the real blow up of a Lagrangian coamoeba. Lagrangian ... More
Some families of special Lagrangian toriNov 09 2000We give a simple proof of the local version of a result of R. Bryant, stating that any 3-dimensional Riemannian manifold can be isometrically embedded as a special Lagrangian submanifold in a Calabi-Yau manifold. We refine the theorem proving that a certain ... More
Symmetries of Lagrangian fibrationsAug 07 2009We construct fiber-preserving anti-symplectic involutions for a large class of symplectic manifolds with Lagrangian torus fibrations. In particular, we treat the K3 surface and the quintic threefold. We interpret our results as corroboration of the view ... More
Isometric embeddings of families of special Lagrangian submanifoldsMar 23 2005We prove that certain Riemannian manifolds can be isometrically embedded inside Calabi-Yau manifolds. For example we prove that given any real-analytic one parameter family of Riemannian metrics $g_t$ on a 3-dimensional manifold $Y$ with volume form independent ... More
On homological mirror symmetry of toric Calabi-Yau three-foldsMar 12 2015We use Lagrangian torus fibrations on the mirror $X$ of a toric Calabi-Yau threefold $\check X$ to construct Lagrangian sections and various Lagrangian spheres on $X$. We then propose an explicit correspondence between the sections and line bundles on ... More
Conifold transitions via affine geometry and mirror symmetryJan 14 2013Sep 15 2014Mirror symmetry of Calabi-Yau manifolds can be understood via a Legendre duality between a pair of certain affine manifolds with singularities called tropical manifolds. In this article, we study conifold transitions from the point of view of Gross and ... More
Semi-global invariants of piecewise smooth Lagrangian fibrationsMar 21 2006We study certain types of piecewise smooth Lagrangian fibrations of smooth symplectic manifolds, which we call stitched Lagrangian fibrations. We extend the classical theory of action-angle coordinates to these fibrations by encoding the information on ... More
Lagrangian 3-torus fibrationsNov 06 2006We give a method to construct singular Lagrangian 3-torus fibrations over certain a priori given integral affine manifolds with singularities, which we call simple. The main result of this article is the proof that the topological Calabi-Yau compactifications ... More
A remark on Besov spaces interpolation over the 2-adic groupApr 19 2011Motivated by a recent result which identifies in the special setting of the 2-adic group the Besov space $\dot{B}^{1,\infty}_{1}(\mathbb{Z}_2)$ with $BV(\mathbb{Z}_2)$, the space of function of bounded variation, we study in this article some functional ... More
Remarks on a fractional diffusion transport equation with applications to the dissipative quasi-geostrophic equationJul 22 2010Jan 22 2013In this article I study H\"older regularity for solutions of a transport equation based in the dissipative quasi-geostrophic equation. Following a recent idea of A. Kiselev and F. Nazarov, I will use the molecular characterization of local Hardy spaces ... More
On Taylor series and Kapteyn series of the first and second typeDec 16 2010We study the relation between the coefficients of Taylor series and Kapteyn series representing the same function. We compute explicit formulas for expressing one in terms of the other and give examples to illustrate our method.
The arrangement field of the space-time pointsJan 18 2012Oct 24 2012Arrangement field theory is a theory of everything which describes all particles as different manifestations of an unique field, the gauge field Sp(12,C). All fields (bosons and fermions in three families) fill up the adjoint representation of Lie group ... More
Alternating register automata on finite words and treesFeb 17 2012Mar 07 2012We study alternating register automata on data words and data trees in relation to logics. A data word (resp. data tree) is a word (resp. tree) whose every position carries a label from a finite alphabet and a data value from an infinite domain. We investigate ... More
Thermodynamic limit of the first-order phase transition in the Kuramoto modelSep 07 2005Oct 19 2005In the Kuramoto model, a uniform distribution of the natural frequencies leads to a first-order (i.e., discontinuous) phase transition from incoherence to synchronization, at the critical coupling parameter $K_c$. We obtain the asymptotic dependence of ... More
Abelianization conjectures for some arithmetic square complex groupsAug 08 2005We extend a conjecture of Kimberley-Robertson on the abelianizations of certain square complex groups.
Anti-tori in square complex groupsNov 24 2004Jul 21 2005An anti-torus is a subgroup $<a,b>$ in the fundamental group of a compact non-positively curved space $X$, acting in a specific way on the universal covering space $\tilde{X}$ such that $a$ and $b$ do not have any commuting non-trivial powers. We construct ... More
A finitely presented torsion-free simple groupNov 24 2004We construct a finitely presented torsion-free simple group $\Sigma_0$, acting cocompactly on a product of two regular trees. An infinite family of such groups has been introduced by Burger-Mozes ([2,4]). We refine their methods and get $\Sigma_0$ as ... More
An application of Kapteyn series to a problem from queueing theoryAug 02 2007We obtain exact solutions of a problem arising from queueing theory using properties of Kapteyn series.
Asymptotic analysis of nested derivativesApr 26 2012We analyze the nested derivatives of a function $\mathfrak{D}^{n}[f]\,(x)$ asymptotically, as $n\rightarrow\infty,$ using a discrete version of the ray method. We give some examples showing the accuracy of our formulas.
Asymptotic analysis of generalized Hermite polynomialsJun 14 2006We analyze the polynomials $H_{n}^{r}(x)$ considered by Gould and Hopper, which generalize the classical Hermite polynomials. We present the main properties of $H_{n}^{r}(x)$ and derive asymptotic approximations for large values of $n$ from their differential-difference ... More
Godel's theorem is invalidOct 21 2005Goedel's results have had a great impact in diverse fields such as philosophy, computer sciences and fundamentals of mathematics. The fact that the rule of mathematical induction is contradictory with the rest of clauses used by Goedel to prove his undecidability ... More
Integral representation of the Ising modelOct 17 2005The partition function of the 2D Ising model coupled to an external magnetic field is studied. We show that the sum over the spin variables can be reduced to an integration over a finite number of variables. This integration must be performed numerically. ... More
Mehler-Heine type formulas for Charlier and Meixner polynomialsJun 24 2014We derive Mehler--Heine type asymptotic formulas for Charlier and Meixner polynomials, and also for their associated families. These formulas provide good approximations for the polynomials in the neighborhood of $x=0,$ and determine the asymptotic limit ... More
Effective upliftings in Large volume compactificationsFeb 04 2015Aug 05 2015After reviewing several mechanisms proposed to get a dS/Minkowski vacuum in moduli stabilization scenarios of type-IIB superstring orientifold compactifications we propose a criterium for characterizing those that may effectively lead to a positive small ... More
On UltraViolet effects in protected inflationary modelsOct 29 2014Inflationary models are usually UV sensitive. Several mechanism have been proposed to protect the necessary features of the potential, and most notably (softly broken) global symmetries as shift-symmetry. We show that, even in presence of these protecting ... More
Objective Bayesian analysis of "on/off" measurementsJul 24 2014Oct 20 2014In high-energy astrophysics, it is common practice to account for the background overlaid with the counts from the source of interest with the help of auxiliary measurements carried on by pointing off-source. In this "on/off" measurement, one knows the ... More
A cluster expansion approach to the Heilmann-Lieb liquid crystal modelJun 07 2015Nov 24 2015A monomer-dimer model with a short-range attractive interaction favoring colinear dimers is considered on the lattice $\mathbb{Z}^2$. Although our choice of the chemical potentials results in more horizontal than vertical dimers, the horizontal dimers ... More
Physical quantities and dimensional analysis: from mechanics to quantum gravityNov 09 2015Jan 30 2016Physical quantities and physical dimensions are among the first concepts encountered by students in their undergraduate career. In this pedagogical review, I will start from these concepts and, using the powerful tool of dimensional analysis, I will embark ... More
Modified gravity and binary pulsars: the Lorentz violating caseJan 18 2016The dynamics of binary pulsars can be used to test different aspects of gravitation. This is particularly important to constrain alternatives to general relativity in regimes which are not probed by other methods. In this short contribution, I will describe ... More
Mutation of representations and nearly Morita equivalenceOct 20 2015Oct 26 2015Buan-Iyama-Reiten-Smith proved, based on Derksen-Weyman-Zelevinsky work, that the Jacobian algebra of two quivers with potential related by a QP-mutation are nearly Morita equivalent. They proved, using Axiom of Choice, that the natural functor $\mu_k$ ... More
On Formal Methods for Collective Adaptive System Engineering. {Scalable Approximated, Spatial} Analysis Techniques. Extended AbstractJul 08 2016In this extended abstract a view on the role of Formal Methods in System Engineering is briefly presented. Then two examples of useful analysis techniques based on solid mathematical theories are discussed as well as the software tools which have been ... More
Symbolic computations in differential geometryApr 20 2008We introduce the C++ library Wedge, based on GiNaC, for symbolic computations in differential geometry. We show how Wedge makes it possible to use the language C++ to perform such computations, and illustrate some advantages of this approach with explicit ... More
Intrinsic torsion in quaternionic contact geometryJun 04 2013Jul 10 2014We investigate quaternionic contact (qc) manifolds from the point of view of intrinsic torsion. We argue that the natural structure group for this geometry is a non-compact Lie group K containing Sp(n)H^*, and show that any qc structure gives rise to ... More
SU(3)-holonomy metrics from nilpotent Lie groupsAug 11 2011One way of producing explicit Riemannian 6-manifolds with holonomy SU(3) is by integrating a flow of SU(2)-structures on a 5-manifold, called the hypo evolution flow. In this paper we classify invariant hypo SU(2)-structures on nilpotent 5-dimensional ... More
A molecular method applied to a non-local PDE in stratified Lie groupsJul 03 2013In this article we study a transport-diffusion equation in the framework of the stratified Lie groups. For this equation we will study the existence of the solutions, a maximum principle, a positivity principle and H\"older regularity.
Improved Sobolev Inequalities and Muckenhoupt weights on stratified Lie groupsJul 23 2010We study in this article the Improved Sobolev inequalities with Muckenhoupt weights within the framework of stratified Lie groups. This family of inequalities estimate the Lq norm of a function by the geometric mean of two norms corresponding to Sobolev ... More
Non-local diffusion equations with Lévy-type operators and divergence free driftMay 13 2012Dec 13 2012We are interested in some properties related to the solutions of non-local diffusion equations with divergence free drift. Existence, maximum principle and a positivity principle are proved. In order to study Holder regularity, we apply a method that ... More
Some remarks on a paper by L. CarlitzApr 22 2005We study a family of orthogonal polynomials which generalizes a sequence of polynomials considered by L. Carlitz. We show that they are a special case of the Sheffer polynomials and point out some interesting connections with certain Sobolev orthogonal ... More
Asymptotic analysis of the Bell polynomials by the ray methodSep 03 2007We analyze the Bell polynomials $B_{n}(x)$ asymptotically as $n\to\infty$. We obtain asymptotic approximations from the differential-difference equation which they satisfy, using a discrete version of the ray method. We give some examples showing the ... More
On direct product subgroups of $\mathrm{SO}_3(\mathbb{R})$Aug 11 2006Let $G_1 \times G_2$ be a subgroup of $\mathrm{SO}_3(\mathbb{R})$ such that the two factors $G_1$ and $G_2$ are non-trivial groups. We show that if $G_1 \times G_2$ is not abelian, then one factor is the (abelian) group of order 2, and the other factor ... More
An incoherent simple groupJul 18 2005We give an example of a finitely presented simple group containing a finitely generated subgroup which is not finitely presented.
On the Parameters of r-dimensional Toric CodesDec 13 2005From a rational convex polytope of dimension $r\ge 2$ J.P. Hansen constructed an error correcting code of length $n=(q-1)^r$ over the finite field $\fq$. A rational convex polytope is the same datum as a normal toric variety and a Cartier divisor. The ... More
AFT Gravitational Model - Unity of All Elementary Particles in Sp(12,C)Feb 09 2010Oct 09 2012A new unifying theory was recently proposed by the author in the publication "Arrangement field theory - beyond strings and loop gravity -". Such theory describes all fields (gravitational, gauge and matter fields) as entries in a matricial superfield ... More
On the Universality of Nonperturbative effects in Stabilized 2D Quantum GravityOct 26 1994Nov 08 1994In this letter I study the universality of the nonperturbative effects and the vacua structure of the stochastic stabilization of the matrix models which defines Pure 2D Quantum Gravity. I show also that there is not tunneling, in the continuum limit, ... More
Toward the unification of the postulates of Quantum MechanicsJan 18 2008In this paper we are going to introduce a new dynamical postulate in Quantum Mechanics. This new principle is defined using path integrals over the set of normalized wave functions. We will show in a qualitative way that this postulate is equivalent to ... More
Nonexistence of simple hyperbolic blow-up for the quasi-geostrophic equationNov 01 1998The problem we are concerned with is whether singularities form in finite time in incompressible fluid flows. It is well known that the answer is ``no'' in the case of Euler and Navier-Stokes equations in dimension two. In dimension three it is still ... More
Variétés abéliennes sur les corps de fonctions de courbes sur des corps locaux supérieursSep 25 2015Let $k$ be a higher-dimensional local field and $X$ be a smooth projective geometrically integral curve over $k$. Let $K$ be the function field of $X$. We define Tate-Shafarevich groups of an abelian variety via cohomology classes locally trivial at each ... More
Reference analysis of the signal + background model in counting experiments II. Approximate reference priorJul 22 2014Mar 02 2015The objective Bayesian treatment of a model representing two independent Poisson processes, labelled as "signal" and "background" and both contributing additively to the total number of counted events, is considered. It is shown that the reference prior ... More
From Hypernuclei to Hypermatter: a Quantum Monte Carlo Study of Strangeness in Nuclear Structure and Nuclear AstrophysicsNov 26 2013The work presents the recent developments in Quantum Monte Carlo calculations for nuclear systems including strange degrees of freedom. The Auxiliary Field Diffusion Monte Carlo algorithm has been extended to the strange sector by the inclusion of the ... More
Embedding into manifolds with torsionDec 22 2008Mar 26 2009We introduce a class of special geometries associated to the choice of a differential graded algebra contained in \Lambda R^n. We generalize some known embedding results, that effectively characterize the real analytic Riemannian manifolds that can be ... More
Invariant forms, associated bundles and Calabi-Yau metricsApr 26 2007Oct 25 2007We develop a method, initially due to Salamon, to compute the space of ``invariant'' forms on an associated bundle X=P\times_G V, with a suitable notion of invariance. We determine sufficient conditions for this space to be d-closed. We apply our method ... More
Some functional inequalities on polynomial volume growth Lie groupsSep 16 2010Jan 21 2011We study in this article some Sobolev-type inequalities on polynomial volume growth Lie groups. We show in particular that improved Sobolev inequalities can be extended without the use of the Littlewood-Paley decomposition to this general framework.
An extension of the classical derivativeMar 22 2006Mar 24 2006We extend the usual definition of the derivative in a way that Calculus I students can easily comprehend and which allows calculations at branch points.
Some remarks on the Wu-Sprung potential. Preliminary reportOct 17 2005Some observations on the Wu-Sprung potential.
How to build a gravity generatorJun 25 2012Aug 04 2013This article explores a simple way to construct an electric device capable to generate an artificial gravitational field by exploiting a resonance phenomenon.
Asymptotic analysis of the derivatives of the inverse error functionJul 09 2006Jun 05 2007The inverse of the error function, $\operatorname{inverf}(x),$ has applications in diffusion problems, chemical potentials, ultrasound imaging, etc. We analyze the derivatives $\frac{d^{n}}{dz^{n}} \operatorname*{inverf}(z) |_{z=0}$, as $n\to \infty$ ... More
Three amalgams with remarkable normal subgroup structuresJun 15 2005We construct three groups $\Lambda_1$, $\Lambda_2$, $\Lambda_3$, which can all be decomposed as amalgamated products $F_9 \ast_{F_{81}} F_{9}$ and have very few normal subgroups of finite or infinite index. Concretely, $\Lambda_1$ is a simple group, $\Lambda_2$ ... More
On infinite groups generated by two quaternionsFeb 24 2005Oct 06 2006Let $x$, $y$ be two integral quaternions of norm $p$ and $l$, respectively, where $p$, $l$ are distinct odd prime numbers. We investigate the structure of $<x,y>$, the multiplicative group generated by $x$ and $y$. Under a certain condition which excludes ... More
Counting $(1,β)$-BM relations and classifying $(2,2)$-BM groupsJul 11 2006In the first part, we prove that the number of $(1,\beta)$-BM relations is $3 \cdot 5 \cdot \ldots \cdot (2\beta + 1)$, which was conjectured by Kimberley. In the second part, we construct two isomorphisms between certain $(2,2)$-BM groups. This completes ... More
Holographic dark energy and late cosmic accelerationOct 02 2006It has been persuasively argued that the number of the effective degrees of freedom of a macroscopic system is proportional to its area rather than to its volume. This entails interesting consequences for cosmology. Here we present a model based on this ... More
Nonperturbative Ground State of the Stochastic Stabilization of 2D Quantum GravityOct 14 1993May 23 1994I construct the ground state, up to first nonperturbative order, of the stochastic stabilization of the zero dimensional matrix model which defines 2D Quantum Gravity. It is given by the linear combination of a perturbative wave function and a nonperturbative ... More
Reduction of internal degrees of freedom in the large N limit in matrix modelsJun 02 1997Nov 05 1998In this paper the large $N$ limit of one hermitian matrix models coupled to an external matrix is considered. It is shown that in the large N limit the number of degrees of freedom are reduced to be order N even though it is order $N^{2}$ for finite N. ... More
Hard X-ray Emission from Magnetars : A Case Study for Simbol XJan 16 2008The magnetar model involves an isolated neutron star with a very high magnetic field (B~10^14-10^15 G), and is invoked to explain the emission processes of two classes of sources, the Anomalous X-ray Pulsars (AXPs) and the Soft Gamma-Ray Repeaters (SGRs). ... More
INTEGRAL Results on Gamma-Ray BurstsFeb 20 2013Despite being a general observatory, and not a Gamma-Ray Bursts (GRBs) oriented mission, INTEGRAL has contributed to several important discoveries in the GRB field. This has been obtained thanks to its unprecedented localization capabilities, and sensitivity ... More
Multiwavelength Gamma-Ray Bursts Observations with ECLAIRsSep 17 2007ECLAIRs is the next space borne instrument that will be fully dedicated to multi-wavelength studies of Gamma-Ray Bursts (GRBs). It consists of a coded mask telescope with a wide (~2 sr) field of view, made of 6400 CdTe pixels (~1000 cm^2), which will ... More
Fourvector algebraNov 20 2007The algebra of fourvectors is described. The fourvectors are more appropriate than the Hamilton quaternions for its use in Physics and the sciences in general. The fourvectors embrace the 3D vectors in a natural form. It is shown the excellent ability ... More
Some observations on a Kapteyn seriesOct 03 2005We study the Kapteyn series $% %TCIMACRO{\dsum \limits_{n=1}^{\infty}}% %BeginExpansion {\displaystyle\sum\limits_{n=1}^{\infty}} %EndExpansion t^{n}\mathrm{J}_{n}(nz) $. We find a series representation in powers of $z$ and analyze its radius of convergence. ... More
Dualité et principe local-global sur des corps locaux de dimension 2May 04 2016Let $k$ be an algebraically closed field, a finite field or a $p$-adic field. Let $K_0=k((x,y))$ be the field of Laurent series in two variables over $k$. We define Tate-Shafarevich groups of a commutative group scheme over $K_0$ via cohomology classes ... More
Powers of two as sum of two generalized Fibonacci numbersSep 09 2014For $k\geq 2$, the $k$-generalized Fibonacci sequence $(F_n^{(k)})_{n}$ is defined by the initial values $0,0,\ldots,0,1$ ($k$ terms) and such that each term afterwards is the sum of the $k$ preceding terms. In this paper, we search for powers of two ... More
Solar Flare Measurements with STIX and MiSolFANov 04 2014Solar flares are the most powerful events in the solar system and the brightest sources of X-rays, often associated with emission of particles reaching the Earth and causing geomagnetic storms, giving problems to communication, airplanes and even black-outs. ... More
Théorèmes de dualité pour les corps de fonctions sur des corps locaux supérieurs et applications arithmétiquesMay 08 2014Jun 01 2014Let $K$ be the function field of a smooth projective curve $X$ over a higher-dimensional local field $k$. We define Tate-Shafarevich groups of a commutative group scheme via cohomology classes locally trivial at each completion of $K$ coming from a closed ... More
On the use of energy loss mechanisms to constrain Lorentz invariance violationsJan 13 2014Mar 20 2014In light of recent and probably upcoming observations of very high energy astroparticles, such as those reported by the IceCube collaboration, we readdress the energy loss mechanism by Lorentz violating particles. We analytically show that Cohen-Glashow's ... More
Cohomogeneity one Einstein-Sasaki 5-manifoldsJun 14 2006Mar 19 2007We consider hypersurfaces in Einstein-Sasaki 5-manifolds which are tangent to the characteristic vector field. We introduce evolution equations that can be used to reconstruct the 5-dimensional metric from such a hypersurface, analogous to the (nearly) ... More
Variations on a Theme by James StirlingFeb 28 2006We present the history and previous approaches to the proof of Stirling's series. We use a different procedure, based on the asymptotic analysis of the difference equation $\Gamma(z+1)=z\Gamma(z)$. The method reproduces Stirling's series very easily and ... More
B physics at CDF - the Beauty of hadron collisionsNov 10 2010The CDF experiment at the Tevatron p-pbar collider established that extensive and detailed exploration of the b-quark dynamics is possible in hadron collisions, with results competitive and supplementary to those from e+e- colliders. This provides an ... More
Branching fractions of B-->h+h'- modes at CDFDec 09 2005I report the analysis of B-->h+h'- decays (where h and h' denote K or pi), in 180 pb-1 of proton-antiproton collisions at s**0.5= 1.96 TeV, with the CDF II detector at the Tevatron Collider. A B-->h+h'- signal was reconstructed at a hadron collider for ... More
On the structure of generalized toric codesNov 02 2006Toric codes are obtained by evaluating rational functions of a nonsingular toric variety at the algebraic torus. One can extend toric codes to the so called generalized toric codes. This extension consists on evaluating elements of an arbitrary polynomial ... More
A counterexample for Improved Sobolev Inequalities over the 2-adic groupNov 03 2010On the framework of the 2-adic group Z_2, we study a Sobolev-like inequality where we estimate the L^2 norm by a geometric mean of the BV norm and the Besov space B(-1,\infty,\infty) norm. We first show, using the special topological properties of the ... More
Light field integration in SUGRA theoriesJan 25 2013Dec 30 2014We revisit the integration of fields in N=1 Supergravity with the requirement that the effective theory has a reliable two-derivative supersymmetric description. In particular we study, in a supersymmetric manifest way, the situation where the fields ... More
The inverse of the cumulative standard normal probability functionJun 17 2003Some properties of the inverse of the Normal distribution are studied. Its derivatives, integrals and asymptotic behavior are presented.
Principles of Arrangement Field TheoryJul 07 2012Aug 12 2013In this paper I attempt to summarize the fundamental principles which underlie to Arrangement Field Theory. In my intention the exposition would be the most possible intelligible and self-contained. However the exposed concepts are revisited in the light ... More
Satisfiability for two-variable logic with two successor relations on finite linear ordersApr 11 2012Oct 18 2013We study the finitary satisfiability problem for first order logic with two variables and two binary relations, corresponding to the induced successor relations of two finite linear orders. We show that the problem is decidable in NEXPTIME.
Asymptotic analysis of the Askey-scheme II: from Charlier to HermiteAug 15 2005We analyze the Hermite polynomials $H_{n}(\xi)$ and their zeros asymptotically as $n\to\infty,$ using the limit relation between the Charlier and Hermite polynomials. Our formulas involve some special functions and they yield very accurate approximations. ... More
Asymptotic analysis of the Krawtchouk polynomials by the WKB methodJan 04 2005Jan 04 2005We analyze the Krawtchouk polynomials K(n,x,N,p,q) asymptotically. We use singular perturbation methods to analyze them for N large with appropriate scalings of the two variables x and n. In particular, the WKB method and asymptotic matching are used. ... More
Quantizable non-local gravityMar 10 2010Oct 15 2012It's widely recognized that general relativity emerges if we impose invariance under local translations and local Lorentz transformations. In the same manner supergravity arises when we impose invariance under local supersymmetry. In this paper we show ... More
Schanuel's conjecture and the exceptional set of $γ$-th arithmetic zeta functionsDec 22 2008Aug 25 2012In this work, we study the arithmetic nature of the numbers of the form $n^{\g}$, for $n \in \N$ and $\g\in \C$. We also consider a related conjecture and we show that it is a consequence of the unipresent Schanuel's conjecture.
Stabilization of 2D Quantum Gravity by branching interactionsOct 04 1995In this paper the stabilization of 2D quantum Gravity by branching interactions is considered. The perturbative expansion and the first nonperturbative term of the stabilized model are the same than the unbounded matrix model which define pure Gravity, ... More
On the equivalence between real and superfield 5d formalismsNov 24 2008We explicitly prove the equivalence and construct a dictionary between two different supersymmetric formalisms for five-dimensional theories commonly used in the literature. One is the real formalism, which consists in doubling the number of degrees of ... More
The PANDA Experiment at FAIROct 30 2007The physics program of the future FAIR facility covers a wide range of topics that address central issues of strong interactions and QCD. The antiproton beam of unprecedented quality in the momentum range from 1 GeV/c to 15 GeV/c will allow the PANDA ... More
On Lorentz-Violating Supersymmetric Quantum Field TheoriesJun 10 2011Dec 21 2011We study the possibility of constructing Lorentz-violating supersymmetric quantum field theories under the assumption that these theories have to be described by lagrangians which are renormalizable by weighted power counting. Our investigation starts ... More
The flux suppression at the highest energiesJun 04 2014Almost half a century ago, Greisen, Zatsepin and Kuz'min (GZK) predicted a "cosmologically meaningful termination" of the spectrum of cosmic rays at energies around $10^{20}$ eV due to their interaction with the cosmic microwave background, as they propagate ... More
Decomposition of the rank 3 Kac-Moody Lie algebra $F$ with respect to the rank 2 hyperbolic subalgebra $Fib$May 23 2016In 1983 Feingold-Frenkel studied the structure of a rank 3 hyperbolic Kac-Moody algebra $\mathcal{F}$ containing the affine KM algebra $A^{(1)}_1$. In 2004 Feingold-Nicolai showed that $\mathcal{F}$ contains all rank 2 hyperbolic KM algebras with symmetric ... More
High-energy physics and cosmological perturbations: observing new physics at large scalesDec 10 2013Correlators of primordial perturbations could provide us with the signatures of physics at earlier times/higher momentum scales than inflation. The key-mechanisms are the interference and cumulation in time related to the interplay of negative- and positive-frequency ... More
Half-flat nilmanifoldsMar 06 2009May 12 2010We introduce a double complex that can be associated to certain Lie algebras, and show that its cohomology determines an obstruction to the existence of a half-flat SU(3)-structure. We obtain a classification of the 6-dimensional nilmanifolds carrying ... More
The Role Of Link Concordance In Knot ConcordanceJan 11 2016Satellite constructions on a knot can be thought of as taking some strands of a knot and then tying in another knot. Using satellite constructions one can construct many distinct isotopy classes of knots. Pushing this further one can construct distinct ... More
Lorentz violation in gravityJul 28 2015The study of gravitational theories without Lorentz invariance plays an important role to understand different aspects of gravitation. In this short contribution we will describe the construction, main advantages and some phenomenological considerations ... More
Polynomial solutions of nonlinear integral equationsMar 12 2008We analyze the polynomial solutions of a nonlinear integral equation, generalizing the work of C. Bender and E. Ben-Naim. We show that, in some cases, an orthogonal solution exists and we give its general form in terms of kernel polynomials.
Asymptotic analysis of the Hermite polynomials from their differential-difference equationJan 04 2006We analyze the Hermite polynomials $H_{n}(x)$ and their zeros asymptotically, as $n\to\infty.$ We obtain asymptotic approximations from the differential-difference equation which they satisfy, using the ray method. We give numerical examples showing the ... More
Asymptotic analysis of the Askey-scheme I: from Krawtchouk to CharlierJan 05 2005We analyze the Charlier polynomials C(n,x)and their zeros asymptotically for large n. We obtain asymptotic approximations, using the limit relation between the Krawtchouk and Charlier polynomials, involving some special functions. We give numerical examples ... More
A Geometric Proof to Cantor's Theorem and an Irrationality Measure for Some Cantor's SeriesApr 29 2008Dec 25 2010Generalizing a geometric idea due to J. Sondow, we give a geometric proof for the Cantor's Theorem. Moreover, it is given an irrationality measure for some Cantor series.