Results for "P. Santos-Sanz"

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Ring dynamics around non-axisymmetric bodies with application to Chariklo and HaumeaNov 23 2018Dense and narrow rings have been discovered recently around the small Centaur object Chariklo and the dwarf planet Haumea, while being suspected around the Centaur Chiron. They are the first rings observed in the Solar System elsewhere than around giant ... More
Transneptunian objects and Centaurs from light curvesOct 08 2009Nov 05 2009We analyze a vast light curve database by obtaining mean rotational properties of the entire sample, determining the spin frequency distribution and comparing those data with a simple model based on hydrostatic equilibrium. For the rotation periods, the ... More
Absolute colors and phase coefficients of trans-Neptunian objects: HV-HR and relative phase coefficientsAug 29 2018The trans-Neptunian objects (TNOs) are small Solar System bodies at large distances from the Sun. As such, their physical properties are difficult to measure. Accurate determination of their physical parameters is essential to model and theorize the actual ... More
Bell states and entanglement dynamics on two coupled quantum moleculesMar 03 2015Mar 06 2015This work provides a complete description of entanglement properties between electrons inside coupled quantum molecules, nanoestructures which consist of two quantum dots. Each electron can tunnel between the two quantum dots inside the molecule, being ... More
The long-wavelength thermal emission of the Pluto-Charon system from Herschel observations. Evidence for emissivity effectsJan 21 2016Thermal observations of the Pluto-Charon system acquired by the Herschel Space Observatory in February 2012 are presented. They consist of photometric measurements with the PACS and SPIRE instruments (nine visits to the Pluto system each), covering six ... More
Optimized Herschel/PACS photometer observing and data reduction strategies for moving solar system targetsSep 17 2013Sep 19 2013The "TNOs are Cool!: A survey of the trans-Neptunian region" is a Herschel Open Time Key Program that aims to characterize planetary bodies at the outskirts of the Solar System using PACS and SPIRE data, mostly taken as scan-maps. In this paper we summarize ... More
Low-energy signals of strongly-coupled electroweak symmetry-breaking scenariosOct 12 2015Mar 22 2016The non-observation of new particles at the LHC suggests the existence of a mass gap above the electroweak scale. This situation is adequately described through a general electroweak effective theory with the established fields and Standard Model symmetries. ... More
Fingerprints of heavy scales in electroweak effective LagrangiansSep 21 2016The couplings of the electroweak effective theory contain information on the heavy-mass scales which are no-longer present in the low-energy Lagrangian. We build a general effective Lagrangian, implementing the electroweak chiral symmetry breaking $SU(2)_L\otimes ... More
Integrating out resonances in strongly-coupled electroweak scenariosNov 30 2016Accepting that there is a mass gap above the electroweak scale, the Electroweak Effective Theory (EWET) is an appropriate tool to describe this situation. Since the EWET couplings contain information on the unknown high-energy dynamics, we consider a ... More
Heavy Resonances in the Electroweak Effective LagrangianSep 15 2015Jan 27 2019As a first step towards the construction of a general electroweak effective Lagrangian incorporating heavy states, we present here a simplified version where only vector and axial-vector spin-1 triplets are involved. We adopt an effective field theory ... More
Photometric and spectroscopic evidence for a dense ring system around Centaur CharikloJul 17 2014Jul 24 2014In this work we aim to study if the variability in the absolute magnitude of Chariklo and the temporal variation of the spectral ice feature, even its disappearance in 2007, can be explained by an icy ring system whose aspect angle changes with time. ... More
Haumea's thermal emission revisited in the light of the occultation resultsNov 23 2018A recent occultation measurement of the dwarf planet Haumea (Ortiz et al. 2017) revealed an elongated shape with the longest axis comparable to Pluto's mean diameter. The chords also indicate a ring around Haumea's equatorial plane, where its largest ... More
Absolute magnitudes and phase coefficients of trans-Neptunian objectsNov 30 2015Context: Accurate measurements of diameters of trans-Neptunian objects are extremely complicated to obtain. Thermal modeling can provide good results, but accurate absolute magnitudes are needed to constrain the thermal models and derive diameters and ... More
A mid-term astrometric and photometric study of Trans-Neptunian Object (90482) OrcusOct 29 2010From CCD observations of a fixed and large star field that contained the binary TNO Orcus, we have been able to derive high-precision relative astrometry and photometry of the Orcus system with respect to background stars. The RA residuals of an orbital ... More
Large Halloween Asteroid at Lunar DistanceOct 26 2016The near-Earth asteroid (NEA) 2015 TB145 had a very close encounter with Earth at 1.3 lunar distances on October 31, 2015. We obtained 3-band mid-infrared observations with the ESO VLT-VISIR instrument and visual lightcurves during the close-encounter ... More
A few words about Resonances in the Electroweak Effective LagrangianJan 28 2015Contrary to a widely spread believe, we have demonstrated that strongly coupled electroweak models including both a light Higgs-like boson and massive spin-1 resonances are not in conflict with experimental constraints on the oblique S and T parameters. ... More
Assessing the accuracy of the Brodsky-Lepage predictionJul 11 2014We show that a consistent set of short-distance conditions on the odd-intrinsic parity resonance chiral Lagrangian couplings can be derived in the large-$N_C$ limit and the single resonance approximation. These constraints are satisfied both by the VVP ... More
Quasianalytic solutions of differential equations and o-minimal structuresMay 04 2005Jun 02 2006It is well known that the non-spiraling leaves of real analytic foliations of codimension 1 all belong to the same o-minimal structure. Naturally, the question arises if the same statement is true for non-oscillating trajectories of real analytic vector ... More
Aspects of quantum coherence in the optical Bloch equationsApr 12 2006Aspects of coherence and decoherence are analyzed within the optical Bloch equations. By rewriting the analytic solution in an alternate form, we are able to emphasize a number of unusual features: (a) despite the Markovian nature of the bath, coherence ... More
TNOs are Cool: a survey of the Transneptunian Region XII. Thermal light curves of Haumea, 2003 VS2 and 2003 AZ84 with Herschel Space Observatory-PACSMay 25 2017Time series observations of the dwarf planet Haumea and the Plutinos 2003VS2 and 2003AZ84 with Herschel/PACS are presented in this work. Thermal emission of these trans-Neptunian objects were acquired as part of the TNOs are Cool Herschel Space Observatory ... More
"TNOs are Cool": A survey of the trans-Neptunian region XIV. Size/albedo characterization of the Haumea family observed with Herschel and SpitzerApr 12 2019A group of trans-Neptunian objects (TNO) are dynamically related to the dwarf planet 136108 Haumea. Ten of them show strong indications of water ice on their surfaces, are assumed to have resulted from a collision, and are accepted as the only known TNO ... More
TNOs are Cool: A Survey of the Transneptunian Region XI: A Herschel-PACS view of 16 CentaursSep 04 2013Mar 05 2014Centaurs are the transitional population between trans-Neptunian objects (TNOs) and Jupiter-family comets. For this reason it is possible to access the smaller ones, which is more difficult to do with the TNO population. The goal of this work is to characterize ... More
"TNOs are Cool": A survey of the trans-Neptunian region X. Analysis of classical Kuiper belt objects from Herschel and Spitzer observationsMar 25 2014The classical Kuiper belt contains objects both from a low-inclination, presumably primordial, distribution and from a high-inclination dynamically excited population. Based on a sample of classical TNOs with observations at thermal wavelengths we determine ... More
Gamma-Band Correlations in Primary Visual CortexNov 20 2018Neural field theory is used to quantitatively analyze the two-dimensional spatiotemporal correlation properties of gamma-band (30 -- 70 Hz) oscillations evoked by stimuli arriving at the primary visual cortex (V1), and modulated by patchy connectivities ... More
Tracks of resonances in electroweak effective LagrangiansOct 18 2017Taking into account the negative searches for New Physics at the LHC, electroweak effective theories are appropriate to deal with current energies. Tracks of new, higher scales can be studied through next-to leading order corrections of the electroweak ... More
Heavy resonances and the electroweak effective theoryNov 26 2018Taking into account the negative results of direct searches for beyond the Standard Model fields and the consequent mass gap between Standard Model and possible unknown states, the use of electroweak effective theories is justified. Whereas at low energies ... More
The dynamics of rings around Centaurs and Trans-Neptunian ObjectsApr 09 2019Since 2013, dense and narrow rings are known around the small Centaur object Chariklo and the dwarf planet Haumea. Dense material has also been detected around the Centaur Chiron, although its nature is debated. This is the first time ever that rings ... More
Magnetic monopoles and dyons revisited: A useful contribution to the study of classical mechanicsMar 02 2015Graduate level physics curricula in many countries around the world, as well as senior-level undergraduate ones in some major institutions, include Classical Mechanics courses, mostly based on Goldstein's textbook masterpiece. During the discussion of ... More
TATI -- A Logo-like interface for microworlds and simulations for physics teaching in Second LifeMay 24 2014Student difficulties in learning Physics have been thoroughly discussed in the scientific literature. Already in 1980, Papert complained that schools teach Newtonian motion by manipulating equations rather than by manipulating the Newtonian objects themselves, ... More
Dynamical transition from a quasi-one dimensional Bose-Einstein condensate to a Tonks-Girardeau gasApr 29 2002May 07 2002We analyze in detail the expansion of a 1D Bose gas after removing the axial confinement. We show that during its one-dimensional expansion the density of the Bose gas does not follow a self-similar solution, but on the contrary, it asymptotically approaches ... More
Dirac operator coupled to instantons on positive definite 4 manifoldsSep 30 2003We study the moduli space of instantons on a simply connected positive definite four manifold by analyzing the classifying map of the index bundle of a family of Dirac operators parametrized by the moduli space. As applications we compute the cohomology ... More
A Mean Field Theory approach to a model with Dipole-Quadrupole interactionMay 24 2002Jun 05 2002We study a model initially proposed to describe a mixture of (CO) and (N2) adsorbed on exfoliated graphite. The approach used here is that of mean field theory. The Mean Field equations and the Helmholtz Free Energy are found. Phase diagrams are calculated ... More
Second Life: game, simulator, or serious game?May 24 2014This article reports on an exploratory case study conducted to examine the viability of Second Life (SL) as an environment for physical simulations and microworlds. It begins by discussing specific features of the SL environment relevant to its use as ... More
Three-dimensional quasi-Tonks gas in a harmonic trapApr 07 2003Jun 23 2003We analyze the macroscopic dynamics of a Bose gas in a harmonic trap with a superimposed two-dimensional optical lattice, assuming a weak coupling between different lattice sites. We consider the situation in which the local chemical potential at each ... More
Dark solitons in a two-component Bose-Einstein condensateOct 17 2000The creation and interaction of dark solitons in a two-component Bose-Einstein condensate is investigated. For a miscible case, the interaction of dark solitons in different components is studied. Various possible scenarios are presented, including the ... More
TNOs are Cool: A survey of the trans-Neptunian region. VIII. Combined Herschel PACS and SPIRE observations of 9 bright targets at 70--500 micronMay 02 2013May 03 2013Transneptunian objects (TNOs) are bodies populating the Kuiper Belt and they are believed to retain the most pristine and least altered material of the solar system. The Herschel Open Time Key Program entitled "TNOs are Cool: A survey of the trans-Neptunian ... More
Second Life Physics: Virtual, real, or surreal?May 24 2014Science teaching detached itself from reality and became restricted to the classrooms and textbooks with their overreliance on standardized and repetitive exercises, while students keep their own alternative conceptions. Papert, displeased with this inefficient ... More
The Inverse Problem for Nested Polygonal Relative EquilibriaDec 07 2017We prove that for some potentials (including the Newtonian one, and the potential of Helmholtz vortices in the plane) relative equilibria consisting of two homothetic regular polygons of arbitrary size can only occur if the masses at each polygon are ... More
Two-dimensional bright solitons in dipolar Bose-Einstein condensatesMar 01 2005We analyze the physics of bright solitons in two-dimensional dipolar Bose-Einstein condensates. These solitons are not possible in short-range interacting gases. In particular, we discuss the necessary conditions for the existence of stable 2D bright ... More
Some comments on the reliability of NOAA's Storm Events DatabaseJun 22 2016Jun 23 2016Storms and other severe weather events can result in fatalities, injuries, and property damage. Therefore, preventing such outcomes to the extent possible is a key concern, and the scientific community faces an increasing demand for regularly updated ... More
On the Philosophy of Bitcoin/Blockchain Technology: Is it a Chaotic, Complex System?Oct 14 2017The philosophy of blockchain technology is concerned, among other things, with blockchain ontology, how it might be characterised, how it is being created, implemented, and adopted, how it operates in the world, and how it evolves over time. This paper ... More
Second Life as a Platform for Physics Simulations and Microworlds: An EvaluationMay 24 2014Often mistakenly seen as a game, the online 3D immersive virtual world Second Life (SL) is itself a huge and sophisticated simulator of an entire Earthlike world. Differently from other metaverses where physical laws are not seriously taken into account, ... More
Big Data as a Mediator in Science Teaching: A ProposalMay 24 2014We live in a digital world that, in 2010, crossed the mark of one zettabyte data. This huge amount of data processed on computers extremely fast with optimized techniques allows one to find insights in new and emerging types of data and content and to ... More
Vortex-vortex interaction in two-component Bose-Einstein condensatesNov 07 2001The vortex-vortex interaction in two-component Bose-Einstein condensates is shown to present characteristic effects not possible in single-component condensates. In particular, vortices in different components undergo separate, but concentric, orbits ... More
Activity of (2060) Chiron possibly caused by impacts?Jan 16 2018The centaur 95P/(2060) Chiron is showing comet-like activity since its discovery, but the mass-loss mechanisms triggering its activity remained unexplained. Although the collision rates in the centaur region are expected to be very low, and impacts are ... More
Small Bodies Near and Far (SBNAF): a benchmark study on physical and thermal properties of small bodies in the Solar SystemOct 25 2017The combination of visible and thermal data from the ground and astrophysics space missions is key to improving the scientific understanding of near-Earth, main-belt, trojans, centaurs, and trans-Neptunian objects. To get full information on a small sample ... More
"TNOs are Cool": A survey of the trans-Neptunian region VI. Herschel/PACS observations and thermal modeling of 19 classical Kuiper belt objectsApr 03 2012Trans-Neptunian objects (TNO) represent the leftovers of the formation of the Solar System. Their physical properties provide constraints to the models of formation and evolution of the various dynamical classes of objects in the outer Solar System. Based ... More
TNOs are Cool: A survey of the trans-Neptunian region V. Physical characterization of 18 Plutinos using Herschel PACS observationsFeb 16 2012We present Herschel PACS photometry of 18 Plutinos and determine sizes and albedos for these objects using thermal modeling. We analyze our results for correlations, draw conclusions on the Plutino size distribution, and compare to earlier results. Flux ... More
"TNOs are Cool": A Survey of the Transneptunian Region IV. Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel Space Observatory-PACSFeb 07 2012Physical characterization of Trans-Neptunian objects, a primitive population of the outer solar system, may provide constraints on their formation and evolution. The goal of this work is to characterize a set of 15 scattered disk (SDOs) and detached objects, ... More
Pluto's ephemeris from ground-based stellar occultations (1988-2016)Mar 12 2019From 1988 to 2016, several stellar occultations have been observed to characterize Pluto's atmosphere and its evolution (Meza et al, 2019). From each stellar occultation, an accurate astrometric position of Pluto at the observation epoch is derived. These ... More
JWST observations of stellar occultations by solar system bodies and ringsOct 22 2015Nov 24 2015In this paper we investigate the opportunities provided by the James Webb Space Telescope (JWST) for significant scientific advances in the study of solar system bodies and rings using stellar occultations. The strengths and weaknesses of the stellar ... More
A portrait of the extreme Solar System object 2012 DR30Apr 26 20132012 DR30 is a recently discovered Solar System object on a unique orbit, with a high eccentricity of 0.9867, a perihelion distance of 14.54 AU and a semi-major axis of 1109 AU, in this respect outscoring the vast majority of trans-Neptunian objects. ... More
Long-term photometric monitoring of the dwarf planet (136472) MakemakeApr 07 2019We studied the rotational properties of the dwarf planet Makemake. The photometric observations were carried out at different telescopes between 2006 and 2017. Most of the measurements were acquired in BVRI broad-band filters of a standard Johnson-Cousins ... More
"TNOs are Cool": A survey of the trans-Neptunian region I. Results from the Herschel Science Demonstration Phase (SDP)May 17 2010The goal of the Herschel Open Time Key programme "TNOs are Cool!" is to derive the physical and thermal properties for a large sample of Centaurs and trans-Neptunian objects (TNOs), including resonant, classical, detached and scattered disk objects. We ... More
Contributions from dimension six strong flavor changing operators to top anti-top, top plus gauge boson, and top plus Higgs boson production at the LHCApr 17 2006May 04 2006We study the effects of a set of dimension six flavor changing effective operators on several processes of production of top quarks at the LHC. Namely, top anti-top production and associated production of a top and a gauge or Higgs boson. Analytical expressions ... More
"TNOs are cool": A survey of the trans-neptunian region. II. The thermal lightcurve of (136108) HaumeaJun 01 2010Thermal emission from Kuiper Belt object (136108) Haumea was measured with Herschel-PACS at 100 and 160 micrometers for almost a full rotation period. Observations clearly indicate a 100-micrometer thermal lightcurve with an amplitude of a factor of ~ ... More
High contrast optical modulation by surface acoustic wavesApr 24 2003Numerical Calculations are employed to study the modulation of light by surface acoustic waves (SAWs) in photonic band gap (PBG) structures. The on/off contrast ratio in PBG switch based on optical cavity is determined as a function of the SAW induced ... More
Impact of FCNC top quark interactions on BR(t -> b W)Mar 25 2009Nov 20 2009We study the effect that FCNC interactions of the top quark will have on the branching ratio of charged decays of the top quark. We have performed an integrated analysis using Tevatron and B-factories data and with just the further assumption that the ... More
Strong flavour changing effective operator contributions to single top quark productionJan 10 2006Mar 16 2006We study the effects of dimension six effective operators on the production of single top quarks at the LHC. The operator set considered includes terms with effective gluon interactions and four-fermion terms. Analytic expressions for the several partonic ... More
Contributions from flavour changing effective operators to the physics of the top quark at LHCMar 17 2006We consider all relevant dimension six operators to perform a model independent analysis of flavour changing single top production at the LHC.
The Coronae of AR LacJun 18 2003We observed the coronally active eclipsing binary, AR Lac, with the High Energy Transmission Grating on Chandra for a total of 97 ks, spaced over five orbits, at quadratures and conjunctions. Contemporaneous and simultaneous EUV spectra and photometry ... More
A Bayesian non-parametric method to detect clusters in Planck dataOct 27 2001Jul 19 2002We show how one may expect a significant number of SZ detections in future Planck data without any of the typical assumptions needed in present component separation methods, such as about the power spectrum or the frequency dependence of any of the components, ... More
Predicted Planck Extragalactic Point Source CatalogueApr 04 2001An estimation of the number and amplitude (in flux) of the extragalactic point sources that will be observed by the Planck Mission is presented in this paper. The study is based on the Mexican Hat wavelet formalism introduced by Cayon et al. 2000. Simulations ... More
Scale-invariant resonance tagging in multijet events and new physics in Higgs pair productionMar 26 2013Jul 09 2013We study resonant pair production of heavy particles in fully hadronic final states by means of jet substructure techniques. We propose a new resonance tagging strategy that smoothly interpolates between the highly boosted and fully resolved regimes, ... More
The albedo-color diversity of transneptunian objectsJun 05 2014Sep 07 2014We analyze albedo data obtained using the Herschel Space Observatory that reveal the existence of two distinct types of surface among midsized transneptunian objects. A color-albedo diagram shows two large clusters of objects, one redder and higher albedo ... More
Varying Alpha MonopolesSep 28 2005We study static magnetic monopoles in the context of varying alpha theories and show that there is a group of models for which the t'Hooft-Polyakov solution is still valid. Nevertheless, in general static magnetic monopole solutions in varying alpha theories ... More
Combining maximum-entropy and the mexican hat wavelet to reconstruct the microwave skyMay 22 2001We present a maximum-entropy method (MEM) and `Mexican Hat' wavelet (MHW) joint analysis to recover the different components of the microwave sky from simulated observations by the ESA Planck satellite in a small patch of the sky. This combined method ... More
New BVRI photometry results on KBOs from the ESO VLTDec 24 2008Dec 29 2008Photometric surveys of transNeptunian objects (TNOs) and Centaurs have suggested possible correlations between some orbital parameters and surface colors of classical objects, scattered disk objects (SDOs), and Centaurs. However, larger sample sizes are ... More
Abelianization of the F-divided fundamental group schemeJan 19 2016Let $(X ,x_0)$ be a pointed smooth proper variety defined over an algebraically closed field. The Albanese morphism for $(X ,x_0)$ produces a homomorphism from the abelianization of the $F$-divided fundamental group scheme of $X$ to the $F$-divided fundamental ... More
Wigner-Moyal description of free variable mass Klein-Gordon fieldsAug 13 2005A system of coupled kinetic transport equations for the Wigner distributions of a free variable mass Klein-Gordon field is derived. This set of equations is formally equivalent to the full wave equation for electromagnetic waves in nonlinear dispersive ... More
Astrophysical constraints on unparticle-inspired models of gravityMay 11 2009Jul 10 2009We use stellar dynamics arguments to constrain the relevant parameters of ungravity inspired models. We show that resulting bounds do constrain the parameters of the theory of unparticles, as far as its energy scale satisfies the condition $\Lambda \geq ... More
Surface and interfacial tensions of Hofmeister electrolytesFeb 20 2018We present a theory that is able to account quantitatively for the surface and interfacial tensions of different electrolyte solutions. It is found that near the interface, ions can be separated into two classes: the kosmotropes and the chaotropes. While ... More
Neutral minima in two-Higgs doublet modelsFeb 09 2007We study the neutral minima of two-Higgs doublet models, showing that these potentials can have at least two such minima with different depths. We analyse the phenomenology of these minima for the several types of two-Higgs doublet potentials, where CP ... More
Quantum phase gate with a selective interactionFeb 09 2001We present a proposal for implementing quantum phase gates using selective interactions. We analize selectivity and the possibility to implement these gates in two particular systems, namely, trapped ions and Cavity QED.
On the design of an expert help system for computer algebra systemsMay 27 2014May 28 2014It is our intention here only to discuss the nature, complexity and tools concerning the design of Smart Help, an expert help facility for aiding users of Computer Algebra Systems. Although the expert help system presented here has been particularly oriented ... More
Resonant spin-changing collisions in spinor Fermi gasesMar 03 2008Spin-changing collisions in trapped Fermi gases may acquire a resonant character due to the compensation of quadratic Zeeman effect and trap energy. These resonances are absent in spinor condensates and pseudo-spin-1/2 Fermi gases, being a characteristic ... More
Stability of dark solitons in three dimensional dipolar Bose-Einstein condensatesDec 21 2007The dynamical stability of dark solitons in dipolar Bose-Einstein condensates is studied. For standard short-range interacting condensates dark solitons are unstable against transverse excitations in two and three dimensions. On the contrary, due to its ... More
Ion specificity and the theory of stability of colloidal suspensionsApr 06 2011A theory is presented which allow us to accurately calculate the critical coagulation concentration (CCC) of hydrophobic colloidal suspensions. For positively charged particles the CCC's follow the Hofmeister (lyotropic) series. For negatively charged ... More
Surface tensions and surface potentials of acid solutionsNov 03 2010A theory is presented which allows us to quantitatively calculate the excess surface tension of acid solutions. The H^+, in the form of hydronium ion, is found to be strongly adsorbed to the solution-air interface. To account for the electrostatic potential ... More
Optical Polarization Mapping toward the interface between the Local Cavity and Loop IDec 15 2010The Sun is located inside an extremely low density and quite irregular volume of the interstellar medium, known as the Local Cavity (LC). It has been widely believed that some kind of interaction could be occurring between the LC and Loop I, a nearby ... More
Entanglement in atomic systems interacting with single-photon pulses in free spaceApr 02 2012Dec 02 2012New technologies providing tight focusing lens and mirrors with large numerical apertures and electro-optic modulation of single photons are now available for the investigation of photon-atom interactions without a cavity. From the theoretical side, new ... More
Tree-Level Vacuum Stability in Multi Higgs ModelsDec 02 2005In the most general model with two Higgs doublets, if a minimum that preserves the $U(1)_{em}$ symmetry exists, then charge breaking (CB) minima cannot occur. The depth of the potential at a stationary point that breaks CB or CP, relative to the $U(1)_{em}$ ... More
Unified Approach to the Large-Signal and High-Frequency Theory of $p-n$-JunctionsOct 02 2007Spectral approach to the charge carrier transport in $p-n$-junctions has allowed us to revise the theoretical results relating to large signal operation of the junction to make them valid for both the low and high frequencies ranges. The spectral composition ... More
A simple model for the kinetics of packaging of DNA in to a capsid against an external forceJan 09 2002We propose a simple model for the kinetics of packaging of viral DNA in to a capsid against an external force trying to prevent it. The model leads to a Butler-Volmer type dependence of the rate of packaging on the pulling force F.
Smart Network Field Theory: The Technophysics of Blockchain and Deep LearningOct 01 2018The aim of this paper is to propose a theoretical construct, smart network field theory, for the characterization, monitoring, and control of smart network systems. Smart network systems are intelligent autonomously-operating networks, a new form of global ... More
Computer algebra in spacetime embeddingMay 28 2014In this paper we describe an algorithm to determine the vectors normal to a space-time V4 embedded in a pseudo-Euclidean manifold M4+n. An application of this algorithm is given considering the Schwarzchild space-time geometry embedded in a 6 dimensional ... More
Phonon instability in two-dimensional dipolar Bose-Einstein CondensatesJul 23 2008The partially attractive character of the dipole-dipole interaction leads to phonon instability in dipolar condensates, which is followed by collapse in three-dimensional geometries. We show that the nature of this instability is fundamentally different ... More
Scattering of two-dimensional solitons in dipolar Bose-Einstein condensatesOct 25 2006Nov 01 2006We analyze the scattering of bright solitons in dipolar Bose-Einstein condensates placed in unconnected layers. Whereas for short-range interactions unconnected layers are independent, a remarkable consequence of the dipole interaction is the appearance ... More
Flavour changing strong interaction effects on top quark physics at the LHCOct 07 2005Jan 26 2006We perform a model independent analysis of the flavour changing strong interaction vertices relevant to the LHC. In particular, the contribution of dimension six operators to single top production in various production processes is discussed, together ... More
Some remarks on tree-level vacuum stability in two Higgs doublet modelsJul 29 2005It is proved that the minimum of a general two Higgs doublet models' potential is stable at tree level. A relation between stability and flavour changing neutral currents at tree level is shown.
Are There Hidden Scalars in LHC Higgs Results?Nov 06 2013Feb 10 2014The Higgs boson recently discovered at the Large Hadron Collider has shown to have couplings to the remaining particles well within what is predicted by the Standard Model. The search for other new heavy scalar states has so far revealed to be fruitless, ... More
Transverse Averaging Technique for Depletion Capacitance of Nonuniform PN-JunctionsJan 23 2007This article evolves an analytical theory of nonuniform $PN$-junctions by employing the transverse averaging technique (TAT) to reduce the three-dimensional semiconductor equations to the quasi-one-dimensional (quasi-1D) form involving all physical quantities ... More
Numerical Analysis of the Stub TransistorApr 08 2003Stubbed waveguides and stub transistors are candidates for next generation electronic devices. In particular, such structures may be used in spintronics-based quantum computation, because of its ability to induce spin-polarized carriers. In this paper, ... More
Novel Results on the Large-Signal Dynamic Admittance of $p-n$-JunctionsApr 29 2002Recent theoretical results obtained by Barybin and Santos have suggested that the dynamic admittance of the $p-n$-junction is proportional to the modified Bessel function of the first kind which depend on an amplitude of ac signal. This result extends ... More
New expression for the K-shell ionizationMay 09 2011A new expression for the total K-shell ionization cross section by electron impact based on the relativistic extension of the binary encounter Bethe (RBEB) model, valid from ionization threshold up to relativistic energies, is proposed. The new MRBEB ... More
Lower Mass Bound on the $W^\prime$ mass via Neutrinoless Double Beta Decay in a 3-3-1 ModelAug 13 2017Nov 10 2017The discovery of neutrino masses has raised the importance of studies in the context of neutrinoless double beta decay, which constitutes a landmark for lepton number violation. The standard interpretation is that the light massive neutrinos, that we ... More
Microscopic theory of a non-equilibrium open bosonic chainOct 17 2016Quantum master equations form an important tool in the description of transport problems in open quantum systems. However, they suffer from the difficulty that the shape of the Lindblad dissipator depends sensibly on the system Hamiltonian. Consequently, ... More
Continuum Field Description of Driven Lattice GasesMay 18 1998We review the critical behaviour of the Driven Lattice Gas (DLG) model. As a result, we obtain a novel Langevin equation for the DLG which depends on the microscopic transition probabilities. We then show how this dependence affects the critical behaviour ... More
Stability of the tree-level vacuum in two Higgs doublet models against charge or CP spontaneous violationJun 21 2004Oct 13 2004We show that in two Higgs doublet models at tree-level the potential minimum preserving electric charge and CP symmetries, when it exists, is the global one. Furthermore, we derived a very simple condition, involving only the coefficients of the quartic ... More
Charge and CP symmetry breaking in two Higgs doublet modelsJul 19 2005Nov 07 2005We show that, for the most generic model with two Higgs doublets possessing a minimum that preserves the $U(1)_{em}$ symmetry, charge breaking (CB) cannot occur. If CB does not occur, the potential could have two different minima, and there is in principle ... More