Alejandro Rivero

• PhD Physics, Universidad de Zaragoza
• University of Zaragoza

If the scalar sector of the supersymmetric standard model is built with different pairs of entities (preons) having the same colour and electric charge assignment that common quarks, then the model has exactly three generations.

The recent wave of mobilizations in the Arab world and across Western countries has generated much discussion on how digital media is connected to the diffusion of protests. We examine that connection using data from the surge of mobilizations that took place in Spain in May 2011. We study recruitment patterns in the Twitter network and find eviden...

With the negative sign for √ m s, the quarks strange, charm and bottom make a Koide tuple. It continues the c-b-t tuple recently found by Rodejohann and Zhang and, more peculiar, it is quasi-orthogonal to the original charged lepton triplet. 1 A history of Koide sum rule In the late seventies, some authors [?,?] resuscited, in a quark dressing, the...

Se aiguye que las propiedades de los dtomos de Denukrito son similares a aquéllas de las fonnas de volumen en geometría diferenciat Este tipo de dtomos no tiene tammio de magnitud finita. It is argued that properties of Democritus atonis parallel those of volume fo �ms in differential geometry. This kind of atoms has not size of finite inagnitude.

We address one of the open problems in quantization theory recently listed by Rieffel. By developping in detail Connes' tangent groupoid principle and using previous work by Landsman, we show how to construct a strict, flabby quantization, which is moreover an asymptotic morphism and satisfies the reality and traciality constraints, on any oriented...

The implementation of the United Nations (UN) Sustainable Development Goals (SDGs) presents a vast and intricate array of challenges, including the establishment of governance systems that engage all societal actors, particularly nongovernmental entities and youth, in proposing solutions and decision-making. This article investigates the potential...

[This corrects the article DOI: 10.3389/fpsyg.2022.848048.].

The emergence of collective intelligence has been studied in much greater detail in small groups than in larger ones. Nevertheless, in groups of several hundreds or thousands of members, it is well-known that the social environment exerts a considerable influence on individual behavior. A few recent papers have dealt with some aspects of large grou...

Network analysis allows us to introduce different metrics that complement the traditional indicators to measure academic performance, generally based on individual production. In this paper, we show how the use of these techniques provides a more global point of view, introducing indicators that, beyond individual merits, measure the capacity of re...

The aim of this paper is to establish the similarities and differences between the way of collaboration and the production of researchers when dealing with publications or with the development of projects and whether the collaboration patterns change across disciplines. We have studied the networks of researchers formed through the collaborations i...

We present a new tool, Kampal (http:// kampal. unizar. es), developed to help to analyze the academic productivity of a research institution from the point of view of Complex Networks. We will focus on two main aspects: paper production and funding by research grants. Thus, we define a network of researchers and define suitable ways of describing t...

If the scalar sector of the supersymmetric standard model is built with different pairs of entities (preons) having the same colour and electric charge assignment that common quarks, then the model has exactly three generations.

Also in http://www.slideshare.net/alejandrorivero/koide2014talk and video at http://viavca.in2p3.fr/alejandro_rivero.html

A supersymmetric version of Chew's old democratic bootstrap argument predicts the exis-tence of three generations of quarks and leptons with one quark, of type "up", more massive that the other five.

Online social networks have an enormous impact on opinions and cultural trends. Also, these platforms have been revealed as a fundamental organizing mechanism in country-wide social movements. Recent events in the Middle East and North Africa (the wave of protests in the Arab world), across Europe (in the form of anti-cuts demonstrations or riots)...

We consider the sampling bias introduced in the study of online networks when collecting data through publicly available APIs (application programming interfaces). We assess differences between three samples of Twitter activity; the empirical context is given by political protests taking place in May 2012. We track online communication around these...

We propose a reorganisation of the standard model and their mesons in order to build supersymmetric multiplets. The presentation is open to improvements to choose the adequate candidates in each recombination.

We study Koide equation sequentially in a chain of mass triplets. We notice at least a not previously published triplet whose existence allows to built a quark mass hierarchy from fixed yukawas for top and up quarks. Also, the new triplets are used to build mass predictions either descending from the experimental values or top and bottom, or ascend...

We collect and analyse messages exchanged in Twitter using two of the platform's publicly available APIs (the search and stream specifications). We assess the differences between the two samples, and compare the networks of communication reconstructed from them. The empirical context is given by political protests taking place in May 2012: we track...

SI

At classical level the topological soliton-like configurations of a certain model can be defined as the finite energy solutions of the equations of motion with suitable boundary conditions at infinity (in our case the scalar field must approach any two different neighboring minima of the classical potential as x → ±∞). Once certain quantum correcti...

Social media have provided plentiful evidence of their capacity for information diffusion. Fads and rumors, but also social unrest and riots travel fast and affect large fractions of the population participating in online social networks (OSNs). This has spurred much research regarding the mechanisms that underlie social contagion, and also who (if...

Between the new physics candidates proposed to explain the t¯t asymmetry measured in the Tevatron, there are some scalar diquarks with electric charge +4/3. This kind of diquark is also needed to classify all the scalars of the supersymmetric standard model, with three generations, under a global flavour symmetry. One of the measurements that have...

The number of people using online social networks in their everyday life is continuously growing at a pace never saw before. This new kind of communication has an enormous impact on opinions, cultural trends, information spreading and even in the commercial success of new products. More importantly, social online networks have revealed as a fundame...

We consider Koide's equation for charged leptons jointly with hypotheses implied in the ancient Dual Quark-Gluon model. The focus is to motivate the possibility of a supersymmetric framework akin to the one of D=11 maximal supergravity. Comment: 7 pages, referencies and some remarks added

New regularities found in the pseudoscalar meson octet are reported. They invite to reconsider models where elementary fermions and composite QCD open strings can be grouped in common supermultiplets. It is proven that, with fermions having the standard model charges, such grouping needs at least three families.

Motivated by the almost exact match of composite supersymmetry, we look for hidden supergenerators in the Wilczek-Zee model. The experimental situation during the development of GUT and SUSY the-ories was different from the actual one. At these times the neutrinos were massless, and the top was expected to be less than 40 GeV. The use of SO(10), wi...

Volunteer computing has come up as a new form of distributed computing. Unlike other computing paradigms like Grids, which use to be based on complex architectures, volunteer computing has demonstrated a great ability to integrate dispersed, heterogeneous computing resources with ease. This article presents ZIVIS, a project which aims to deploy a c...

We suggest a very simple but general operator to break mass degeneration between representations of the Poincare group having spin 1 and 1/2. A quantity very similar, at experimental 0.13 $\sigma$ level, to Weinberg's angle, appears during the process.

Asking very elementary relativistic quantum mechanics to meet quantums of area and time, it is possible to observe at a general level: a) the seesaw bound for the mass of neutrinos, and b) the need of a gauge group at energies below Planck mass.

We revisit Sakurai's remark on the regularities of lepton-pair widths for mesons, extending the panorama to radiative $X \to \gamma \gamma$ and total decays. The regularities persist, and somehow surprisingly some of them seem to relate with Fermi's constant -or $Z^0$-.

We note that hadronic susy (empirical quark-diquark) symmetry can be expanded into the lepton sector, and that for three generations the counting of degrees of freedom is the one we need to build charged supermultiplets. For this to cure hierarchy, Higgs modeling becomes restricted.

The GUT value of Weinberg's angle is also the value that minimises the total square matrix elements of $Z^0$ decay, independently of any GUT consideration, and thus the one that maximises the neutrino branching ratio against total width. We review the proof of this result and some related facts.

We inquire if the total decay rate of neutral vector mesons can contain relevant off-shell contributions from the triangle anomaly. The answer seems to be affirmative for the case of J/Psi, and as a byproduct we get estimates of the decay width for neutral pions.

We present a short historical and bibliographical review of the lepton mass formula of Yoshio Koide, as well as some speculations on its extensions to quark and neutrino masses, and its possible relations to more recent theoretical developments.

We present a fit to the experimental charged lepton masses as coming from radiative corrections in QED.

It is open the possibility of imposing requisites to the quantisation of Connes' Spectral Triples in such a way that a critical dimension D=26 appears.

It can be found that with the adequate measure, the beta stability line is equidistant from neutron and proton drip lines. We explore this fact and its predictive potentiality in the simplest case, the classic liquid drop formula.

According standard models of nuclei, steepest variations of binding energy at the drip lines should happen for nuclear masses of 45, 68, 92, 115, 175 and 246 GeV.

Assuming a minimum value for area measurement, the emergence of quantum mechanics can be easily motivated from naive consideration of gravitational force. Here we provide some pedagogical examples and extensions. At the same time, the role of Planck mass is shown to be of some theoretical influence even at low energies.

We note an intriguing coincidence in nuclear levels, that the subshells responsible for doubly magic numbers happen to bracket nuclei at the energies of the Standard Model bosons. This could show that these bosons actually contribute to the effective mesons of nuclear models.

They identify the full or solid with "what is," and the void or rare with "what is not" (hence they hold that "what is not" is no less real than "what is") [Arist. Metaphys. A 4 985b4] J. Needham joined explicitly with Berthelot in remarking the atomism does not appear anywhere in the alchemical treatises, neither in the East nor in the West. Which...

Noncommutativity lays hidden in the proofs of classical dynamics. Modern frameworks can be used to bring it to light: *-products, groupoids, q-deformed calculus, etc.

The level splitting formula of an asymmetric double well potential is calculated taking into account the multi-instanton contr ibutions (dilute gas approximation). Results can be related with known semiclassical ones obtained with a truncated hamiltonian, and the symmetric case is easily recovered provided we consider the right limit.

The level splitting formula of an asymmetric double well potential is calculated taking into account the multi-instanton contributions (dilute gas approximation). Results can be related with known semiclassical ones obtained with a truncated hamiltonian, and the symmetric case is easily recovered.

We present some clues to the study of the renormalization group, at graduate level, as well as some bibliographical pointers to classical resources. Just the kind of things one had liked to hear when starting to study the subject.

We walk out the landscape of K-theoretic Poincare Duality for finite algebras, which will pave the way to get continuum Dirac operators from discrete noncommutative manifolds.

We exhibit a series of discrete spectral triples converging to the canonical spectral triple of a finite dimensional manifold. Thus we bypass the non-go theorem of Gokeler and Schucker. Sort of counterexample.

We recall the origins of di#erential calculus from a modern perspective.

It is argued that properties of Democritus atoms parallel those of volume forms in di#erential geometry. This kind of atoms has not "size" of finite magnitude.

We have commemorated the 20th anniversary of the Wilson-Kogut review [14] by building a toy model of the W-K RG in one dimensional Quantum Mechanics... With it, we show (well, sort of) that the RG flow in the set of 1-dimensional finite range S matrices fullfilling S + -k = QSkQ defines the known four parametric set of zero-range interactions.

It is pointed out that ambiguities in the regularization of actions with second derivatives seem to happen with the same multiplicity that the standard model of elementary particles 1

The complex exponential weighting of Feynman formalism is seen to happen at the classical level. (Finiteness of) Feynman path integral formula is suspected then to appear as a consistency condition for the existence of certain Dirac measures over functional spaces.

The well known operator ordering ambiguity could motivate the existence of generations. This possibility is explored by exploiting the relationship between ordering and discretization rules. 1 Wilson fermion as analogy Non Commutative Geometry is not the only area knowing how to get mass terms from nowhere. Lattice theorists learnt time ago a nice...

It is reviewed how Renormalization Group, species doubling and CKM mixing are known to appear in numerical analysis: Butcher group, parasitic solutions and higher order methods 1 Butcher Group In the late sixties Butcher [2] found a composition rule for Runge Kutta methods by using a multiplication of rooted trees. Recently the same multiplication...

It is suggested that generations are linked to the need of calculating curvature of space via a deformed or discrete calculus. Quantization would limit the deformation, building three generations, and not four, as other interpretation could imply.

It is argued that properties of Democritus' atoms parallel those of volume forms in differential geometry. This kind of atoms has not "size" of finite magnitude. ----- Se arguye que las propiedades de los atomos de Democrito son paralelas a las de sus formas de volumen en geometria diferencial. Este tipo de atomos no tiene tamanno de magnitud finit...

The well known operator ordering ambiguity could motivate the existence of generations. This possibility is explored by exploiting the relationship between ordering and discretization rules. Context is drawn from lattice theory and non commutative geometry.

A problem from Democritus is used to illustrate the building, and use, of infinitesimal covectors from its regularized, finite, counterpart.

We present some plausible definitions for the tangent grupoid of a manifold M, as well as some of the known applications of the structure. This is a kind of introductory note.

We study numerically the critical properties of the U(1)-Higgs lattice model, with fixed Higgs modulus, in the region of small gauge coupling where the Higgs and confining phases merge. We find evidence for a first-order transition line that ends in a second-order point. By means of a rotation in parameter space we introduce thermodynamic magnitude...

We investigate restrictions to be imposed over the non commutative geometry model C+M_2+M_3 to make it to fit with experimental data. By constraining the action over quarks, a leptophobic Z' is got

We build a toy model of the Wilson-Kogut renormalization group in one dimensional Quantum Mechanics. With it, we show how the RG flow in the space of 1-D S matrices of finite range defines, as renormalized interactions, the known four parametric set of contact interactions, thus providing a suitable framework for its study. Comment: Four figures no...

Geometric motion in rank-one symmetric spaces is shown to describe a simple supersymmetric quantum mechanical system. Supersymmetry does indeed lead to a purely algebraic solution for the compact case, providing eigenfunctions and eigenvalues, and also for the Riemannian odd-dimension hyperbolic and Euclidean spaces where SUSY supplies easily the e...

We study SU(2) lattice gauge theory in small volumes and with twist m = (1, 1, 1). We investigate the presence of the periodic instantons of and determine their free energy and their contribution to the splitting of energy flux sectors E(e = (1, 1, 1)) − E(e = (0, 0, 0)).

We stimulate the U(1)-Higgs lattice model with fixed Higgs modulus, in the region where the transition between the Higgs and Confining phases diappears. We find a first order transition line that ends in a second order point. Thermodynamic magnitudes and their associated critical exponents are introduced. The measured data allow us to fit the criti...

We study $SU(2)$ lattice gauge theory in small volumes and with twist $\vec{m}=(1,1,1)$. We investigate the presence of the periodic instantons of $Q=\frac{1}{2}$ and determine their free energy and their contribution to the splitting of energy flux sectors \mbox{$E(\vec{e}=(1,1,1))-E(\vec{e}=(0,0,0)) $.}

We simulate the compact U(1)-Higgs model in a four-dimensional lattice. We present a numerical study for the behaviour around the region where the transition between the confining and Higgs phases disappears. The transition line is found to be first order and to end in a second-order point. We measure the critical exponents of the endpoint obtainin...

We study numerically the critical properties of the U(1)-Higgs lattice model, with fixed Higgs modulus, in the region of small gauge coupling where the Higgs and Confining phases merge. We find evidence of a first order transition line that ends in a second order point. By means of a rotation in parameter space we introduce thermodynamic magnitudes...

The GUT value of Weinberg's angle is also the value that minimises the total square matrix elements of Z0 decay, independently of any GUT consid- eration, and thus the one that maximises the neutrino branching ratio against total width. We review the proof of this result and some related facts.

Some thoughts on supersymmetry, for further research

Publicación que tiene como objetivo principal convertirse en un instrumento puesto a disposición del profesorado que imparte el área o alguna de las materias de las Ciencias Sociales, intentando proporcionarles materiales que sirvan a su tarea y a sus responsabilidades ante sus alumnos, una herramienta que propicie, favorezca y estimule su trabajo,...

En: Las Ciencias Sociales en Internet Mérida (Badajoz) 2001 ; p. 27-34 Se analiza qué es Internet, los requisitos de conexión de un ordenador a la red y los distintos servicios que ofrece: correo electrónico, news, chats, foros de discusión. Así mismo se hace una introducción al manejo básico de los navegadores y a la búsqueda de información en Int...