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
Physical properties of centaur (54598) Bienor from photometryDec 08 2016We present time series photometry of Bienor in four observation campaigns from 2013 to 2016 and compare them with previous observations in the literature dating back to 2000. The results show a remarkable decline in the amplitude of the rotational light ... More
Stellar Occultations by Transneptunian objects: from Predictions to Observations and Prospects for the FutureMay 10 2019In terms of scientific output, the best way to study solar system bodies is sending spacecraft to make in-situ measurements or to observe at close distance. Probably, the second best means to learn about important physical properties of solar system objects ... 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
Molecular observations of comets C/2012 S1 (ISON) and C/2013 R1 (Lovejoy): HNC/HCN ratios and upper limits to PH3Mar 03 2014Mar 08 2014We present molecular observations carried out with the IRAM 30m telescope at wavelengths around 1.15 mm towards the Oort cloud comets C/2012 S1 (ISON) and C/2013 R1 (Lovejoy) when they were at 0.6 and 1 au, respectively, from the Sun. We detect HCN, HNC, ... More
Short-term variability of a sample of 29 trans-Neptunian objects and CentaursApr 27 2010We present results of 6 years of observations, reduced and analyzed with the same tools in a systematic way. We report completely new data for 15 objects, for 5 objects we present a new analysis of previously published results plus additional data and ... 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
Analysis of non-Gaussian CMB maps based on the N-pdf. Application to WMAP dataDec 09 2008May 21 2009We present a new method based on the N-point probability distribution (pdf) to study non-Gaussianity in cosmic microwave background (CMB) maps. Likelihood and Bayesian estimation are applied to a local non-linear perturbed model up to third order, characterized ... More
Constraints on f_nl and g_nl from the analysis of the N-pdf of the CMB large scale anisotropiesOct 16 2009Jan 08 2010[Abridged] In this paper we explore a local non-linear perturbative model up to third order as a general characterization of the CMB anisotropies. We focus our analysis in large scale anisotropies. At these angular scales, the non-Gaussian description ... More
Rotational fission of Trans-Neptunian Objects. The case of HaumeaOct 17 2011We present several lines of evidence based on different kinds of observations to conclude that rotational fission has likely occurred for a fraction of the known Trans-Neptunian Objects (TNOs). It is also likely that a number of binary systems have formed ... 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
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
Possible ring material around centaur (2060) ChironJan 23 2015We propose that several short duration events observed in past stellar occultations by Chiron were produced by rings material. From a reanalysis of the stellar occultation data in the literature we determined two possible orientations of the pole of Chiron's ... More
Fingerprints of heavy scales in electroweak effective LagrangiansSep 21 2016Jul 21 2017The 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
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
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
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
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
The thermal emission of Centaurs and Trans-Neptunian objects at millimeter wavelengths from ALMA observationsSep 20 2017The sensitivity of ALMA makes it possible to detect thermal mm/submm emission from small/distant Solar System bodies at the sub-mJy level. Measured fluxes are primarily sensitive to the objects' diameters, but deriving precise sizes is somewhat hampered ... More
Observation of light echoes around very young starsJul 14 2010Jul 16 2010The goal of the paper is to present new results on light echoes from young stellar objects. Broad band CCD images were obtained over three months at one-to-two week intervals for the field of NGC 6726, using the large field-of-view remotely-operated telescope ... 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
Temperature crossover of decoherence rates in chaotic and regular bath dynamicsMar 21 2012Apr 03 2012The effect of chaotic bath dynamics on the decoherence of a quantum system is examined for the vibrational degrees of freedom of a diatomic molecule in a realistic, constant temperature collisional bath. As an example, the specific case of I$_2$ in liquid ... 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 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 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
Colorful Imprints of Heavy States in the Electroweak Effective TheoryOct 24 2018May 25 2019We analyze heavy states from generic ultraviolet completions of the Standard Model in a model-independent way and investigate their implications on the low-energy couplings of the electroweak effective theory. We build a general effective Lagrangian, ... More
Lunar impact flashes from Geminids, analysis of luminous efficiencies and the flux of large meteoroids on EarthNov 23 2015We analyze lunar impact flashes recorded by our team during runs in December 2007, 2011, 2013 and 2014. In total, 12 impact flashes with magnitudes ranging between 7.1 and 9.3 in V band were identified. From these, 9 events could be linked to the Geminid ... More
Multiwavelength observations of a bright impact flash during the January 2019 total lunar eclipseMay 11 2019We discuss here a lunar impact flash recorded during the total lunar eclipse that occurred on 2019 January 21, at 4h 41m 38.09 +- 0.01 s UT. This is the first time ever that an impact flash is unambiguously recorded during a lunar eclipse and discussed ... 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
High-order stroboscopic averaging methods for highly oscillatory delay problemsNov 30 2018We introduce and analyze a family of heterogeneous multiscale methods for the numerical integration of highly oscillatory systems of delay differential equations with constant delays. The methodology suggested provides algorithms of arbitrarily high accuracy. ... More
Quantum entanglement driven by electron-nanomechanical couplingApr 03 2018We study the effects of an electron-electron effective interaction on the formation of entangled states in a two-qubit system, driven by the coupling of electronic states with vibrational modes. The system is composed by four quantum dots separated in ... More
Pseudoscalar pole light-by-light contributions to the muon $(g-2)$ in Resonance Chiral TheoryMar 21 2018Jun 13 2018We have studied the $P\to\gamma^\star\gamma^\star$ transition form-factors ($P=\pi^0,\eta,\eta'$) within a chiral invariant framework that allows us to relate the three form-factors and evaluate the corresponding contributions to the muon anomalous magnetic ... 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
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
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
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
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
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
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
Absolute colours and phase coefficients of trans-Neptunian objects: Correlations and PopulationsJul 05 2019The study of the visible colours of the trans-Neptunian objects opened a discussion almost 20 years ago which, in spite of the increase in the amount of available data, seems far from subside. Visible colours impose constraints to the current theories ... 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
The Hubble PanCET program: an extensive search for metallic ions in the exosphere of GJ 436 bJul 12 2019(Abridged) The quiet M2.5 star GJ 436 hosts a warm Neptune that displays an extended atmosphere that dwarfs its own host star. Predictions of atmospheric escape in such planets state that H atoms escape from the upper atmosphere in a collisional regime ... More
High quality c-axis oriented ZnO thin-film obtained at very low pre-heating temperatureNov 20 2006Highly oriented ZnO thin-film has been obtained at a very low pre-heating temperature, with the spin-coating sol-gel technique. The dependence of the c-axis orientation on the pre-heating temperature has been studied with experimental design and response ... More
Quantum liquid droplets in a mixture of Bose-Einstein condensatesAug 25 2017Quantum droplets are small clusters of atoms self-bound by the balance of attractive and repulsive forces. Here we report on the observation of a novel type of droplets, solely stabilized by contact interactions in a mixture of two Bose-Einstein condensates. ... 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.
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
"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
"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
Overlapping resonances in the control of intramolecular vibrational redistributionMar 28 2007Coherent control of bound state processes via the interfering overlapping resonances scenario [Christopher et al., J. Chem. Phys. 123, 064313 (2006)] is developed to control intramolecular vibrational redistribution (IVR). The approach is applied to the ... More
Flat functions in Carleman ultraholomorphic classes via proximate ordersFeb 11 2014Whenever the defining sequence of a Carleman ultraholomorphic class (in the sense of H. Komatsu) is strongly regular and associated with a proximate order, flat functions are constructed in the class on sectors of optimal opening. As consequences, we ... More
Feshbach resonances in potassium Bose-Bose mixturesOct 29 2018We present a detailed study of the scattering properties of ultracold mixtures of bosonic potassium atoms. We locate 20 previously unobserved Feshbach resonances in isotopic 39K-41K mixtures. These are assigned to s-wave molecular channels by comparison ... More
Bright soliton to quantum droplet transition in a mixture of Bose-Einstein condensatesOct 30 2017Attractive Bose-Einstein condensates can host two types of macroscopic self-bound states of different nature: bright solitons and quantum liquid droplets. Here, we investigate the connection between them with a Bose-Bose mixture confined in an optical ... 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
Dynamical Casimir effect entangles artificial atomsFeb 18 2014Aug 06 2014We show that the physics underlying the dynamical Casimir effect may generate multipartite quantum correlations. To achieve it, we propose a circuit quantum electrodynamics (cQED) scenario involving superconducting quantum interference devices (SQUIDs), ... 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
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
Detection of non-Gaussianity in the WMAP 1-year data using spherical waveletsOct 09 2003Mar 15 2004A non-Gaussian detection in the WMAP 1-year data is reported. The detection has been found in the combined Q-V-W map proposed by the WMAP team (Komatsu et al. 2003) after applying a wavelet technique based on the Spherical Mexican Hat Wavelet (SMHW). ... More
Point Source Detection using the Spherical Mexican Hat Wavelet on simulated all-sky Planck mapsDec 31 2002May 13 2003We present an estimation of the point source (PS) catalogue that could be extracted from the forthcoming ESA Planck mission data. We have applied the Spherical Mexican Hat Wavelet (SMHW) to simulated all-sky maps that include CMB, Galactic emission (thermal ... 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
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
Combined MEM and MHW analysis of CMB observationsNov 07 2000We present a combined maximum-entropy method (MEM) and Mexican Hat wavelet (MHW) analysis in order to recover the different components of the microwave sky. We apply this technique to simulated observations by the ESA Planck satellite in small patches ... 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
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
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.
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
Local Wealth Redistribution Promotes Cooperation in Multiagent SystemsFeb 05 2018Designing mechanisms that leverage cooperation between agents has been a long-lasting goal in Multiagent Systems. The task is especially challenging when agents are selfish, lack common goals and face social dilemmas, i.e., situations in which individual ... More
Vector bundles trivialized by proper morphisms and the fundamental group schemeDec 18 2009Let X be a smooth projective variety defined over an algebraically closed field k. Nori constructed a category of vector bundles on X, called essentially finite vector bundles, which is reminiscent of the category of representations of the fundamental ... More
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
Ions at hydrophobic interfacesFeb 13 2018We argue that the kosmotropes remain strongly hydrated in the vicinity of a hydrophobic surface, while the chaotropes lose their hydration shell and can become adsorbed to the interface. The mechanism of adsorption is still a subject of debate. We argue ... 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
Master equation for dissipative interacting qubits in a common environmentOct 31 2013Mar 08 2014In this paper, we derive a microscopic master equation for a pair of XY-coupled two-level systems interacting with the same memoryless reservoir. In particular, we apply this master equation to the case of a pair of two-level atoms in free space where ... More
Electrolytes between dielectric charged surfaces: Simulations and theoryAug 11 2015We present a simulation method to study electrolyte solutions in a dielectric slab geometry using a modified 3D Ewald summation. The method is fast and easy to implement, allowing us to rapidly resum an infinite series of image charges. In the weak coupling ... More
Adsorption of cationic polyions to a hydrophobic surface in the presence of Hofmeister saltsMar 25 2014We study, using extensive Monte Carlos simulations, the behavior of cationic polyelectrolytes near hydrophobic surfaces in solutions containing Hofmeister salts. The Hofmeister anions are divided into kosmotropes and chaotropes. Near a hydrophobic surface, ... More
Polarizable Surfaces: Weak and Strong Coupling RegimesOct 31 2012Nov 07 2012We study the ionic distribution near a charged surface. A new method for performing Monte Carlo simulations in this geometry is discussed. A theory is then presented that allows us to accurately reproduce the density profiles obtained in the simulations. ... More
Effect of dielectric discontinuity on a spherical polyelectrolyte brushJan 11 2018In this paper we perform molecular dynamics simulations of a spherical polyelectrolyte brush and counterions in a salt-free medium. The dielectric discontinuity on the grafted nanoparticle surface is taken into account by the method of image charges. ... 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
PoW, PoS, & Hybrid protocols: A Matter of Complexity?May 13 2018May 23 2018In a previous paper, it was discussed whether Bitcoin and/or its blockchain could be considered a complex system and, if so, whether a chaotic one, a positive response raising concerns about the likelihood of Bitcoin/blockchain entering a chaotic regime, ... 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
Big Data as a Technology-to-think-with for Scientific LiteracyOct 12 2017This research aimed to identify indications of scientific literacy resulting from a didactic and investigative interaction with Google Trends Big Data software by first-year students from a high-school in Novo Hamburgo, Southern Brazil. Both teaching ... 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
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
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