225,642 research outputs found
SU(3)C X SU(3)L X U(1)X models in view of the 750 GeV diphoton signal
No full textAbstract. We analyze the recent diphoton signal reported by ATLAS and CMS collaborations in the context of three anomaly free models, the SU(6) ⊗ U(1)X ⊃ SU(3)C ⊗ SU(3)L ⊗ U(1)X embedded group, the SU(3)C ⊗SU(3)L⊗U(1)X alone and a non-universal U(1)X model, all of them with a 750 GeV scalar candidate which can decay into two photons. These models may explain the 750GeV signal by means of one loop decays to γγ through charged vector and Higgs bosons, as well as top-, bottom- and electron-like exotic particles that arise naturally from the condition of anomaly cancellations of the SU(3)C ⊗SU(3)L ⊗U(1)X models.Analizamos la reciente señal difotónica reportada por las colaboraciones ATLAS y CMS en el contexto de tres modelos libres de anomalías, el grupo embebido SU(6) ⊗ U(1)X ⊃ SU(3)C ⊗ SU(3)L ⊗ U(1)X, el grupo SU(3)C ⊗ SU(3)L ⊗ U(1)X solamente y finalmente un modelo no universal U(1)X, todos ellos con un candidato escalar de 750 GeV que puede decaer en dos fotones. Estos modelos pueden explicar la señal de 750GeV por medio de decaimientos a un bucle a γγ mediante bosones de Higgs cargados, así como a través de quarks top, bottom y electrones exóticos que aparecen de manera natural de la condición de la cancelación de anomalías de los modelos SU(3)C ⊗ SU(3)L ⊗ U(1)X.Maestrí
A proof of concept of a BioMEMS glucose biosensor using microfabricated SU-8 films
No full textThe present project investigated and proved the concept of developing a novel
BioMEMS glucose micro-biosensor using a simple one-step microfabrication process of
the widely used SU-8 polymer. More specifically, the study focused on the investigation
of the suitability of the SU-8 polymer as a matrix for enzyme immobilisation that is
carried out during the microfabrication process. A comparative study between
commercially available SU-8 and “customised” SU-8 solutions showed that the
optimum concentration of photo-initiator for stress reduction can be achieved easier
with “customised” SU-8 solutions. The most appropriate type of microstructure for the
SU-8 matrix and the corresponding required microfabrication process were defined and
encapsulation of the enzyme GOx in the SU-8 solution was accomplished. A detailed
experimental investigation of the immobilised enzyme’s activity inside the SU-8 matrix,
was carried out using amperometric detection of hydrogen peroxide in a 3-electrode setup.
SU-8 films were immersed in a buffer solution and the platinum working electrode
was brought in close contact with the film. Films without enzyme showed negligible
variation in current upon the addition of glucose, as opposed to films with encapsulated
enzyme which showed a very clear increase in current. Experiments using films of
increased thickness or enzyme concentration, showed a higher response, thus proving
that the enzyme remained active not only on the film’s surface, but inside the matrix as
well. In the fluorescence spectroscopy experiments, the utilisation of the tris (4,7-
diphenyl-1,10-phenanthroline) ruthenium(II) dichloride oxygen indicator, which was
also captured in the polymer matrix during the microfabrication process, was proven to
be very sensitive to glucose concentration changes during the glucose oxidation and
there was no photo-bleaching.
The experimental investigations proved that the proposed concept of using SU-8
matrices for the immobilisation of biomolecules, is a valid proposal for the construction
of a BioMEMS glucose biosensor. An important outcome was the successful
immobilisation of glucose oxidase in SU-8 microfabricated structures. The enzyme still
showed activity despite the “hostile” conditions during microfabrication The proof of
principle of enzyme immobilisation in SU-8 films opens up new possibilities for
combining BioMEMS with biosensors and organic electronics
Scaling and asymptotic scaling in the SU(2) gauge theory
No full textFingberg J, Heller UM, Karsch F. Scaling and asymptotic scaling in the SU(2) gauge theory. Nuclear Physics, B. 1993;392(2):493-517.We determine the critical couplings for the deconfinement phase transition in SU(2) gauge theory on N(tau) x N(sigma)3 lattices with N(tau) = 8 and 16 and N(sigma) varying between 16 and 48. A comparison with string tension data shows scaling of the ratio T(c)/square-root sigma in the entire coupling regime beta = 2.30-2.75, while the individual quantities still exhibit large scaling violations. We find T(c)/square-root sigma = 0.69(2). We also discuss in detail the extrapolation of T(c)/LAMBDA(MSBAR) and square-root sigma/LAMBDA(MSBAR) to the continuum limit. Our result, which is consistent with the above ratio, is T(c)/LAMBDA(MSBAR) = 1.23(11) and square-root sigma/LAMBDA(MSBAR) = 1.79(12). We also comment upon corresponding results for SU(3) gauge theory and four-flavour QCD
Alfonso X y su descendencia
No full textEl autor estudia la figura de Alfonso X, rey de Castilla, y su entorno familiar. Su nacimiento y principales acontecimientos de su vida, su matrimonio y su descendencia legítima e ilegítima, haciendo especial hincapié en sus datos cronológicos y matrimoniales. Igualmente hace algunas reflexiones sobre su posición institucional en la monarquía castellana, durante el siglo XIII.The author studies the figure of Alfonso X, king of Castile, and his family environment. His birth and main events of his life, his marriage and his legitimate and illegitimate offspring, with special emphasis on his chronological and marital data. He also makes some reflections on his institutional position in the Castilian monarchy, during the thirteenth century
La pena : proporcionalidad en su establecimiento e individualización
No full textTesis doctoral de la Universidad Alfonso X "El sabio"- Facultad de Estudios Sociales. Programa de Doctorado Cuestiones Actuales de Derecho Español e InternacionalBibliografíaTesis realizada por Jaime Camacho Florez; dirigida por Eduardo de Urbano Castrillo.Facultad de Estudios Sociale
Effects of quark family nonuniversality in su(3)c su(4)l u(1)x models
No full textLa cancelación de anomalías entre las familias de fermiones en la extensión SU(3)c SU(4)L U(1)X del Modelo Estándar (SM) requiere que una generación de quarks transforme de manera diferente a las otras dos bajo el grupo gauge, lo cual da lugar a Corrientes Neutras que Cambian Sabor (FCNC) a nivel árbol. Como una familia de quarks transforma diferentemente, existen tres posibles asignaciones de autoestados gauge en autoestados de masa y las implicaciones fenomenológicas del modelo dependerán de cuál asignación se elija. En este trabajo, usando datos de precisión electrodébil a la escala de la masa del bosón Z del SM, considerando violación de paridad atómica y datos experimentales de la mezcla de mesones neutros, se examinan los modelos de tres familias sin cargas eléctricas exóticas basados en la simetría SU(3)c SU(4)L U(1)X. Se estudian los efectos de la no universalidad de familias de quarks sobre las cotas al ángulo de mezcla entre las corrientes neutras presentes en los modelos estudiados y sobre las escalas de masa de los nuevos bosones de gauge predichos por la teoría. Para que las cotas inferiores sobre esas escalas de masas sean tan bajas como sea posible, la tercera familia de quarks debe transformar diferentemente bajo SU(4)L U(1)X. / Abstract Flavour changing neutral currents arise in the SU(3)c SU(4)L U(1)X extension of the standard model because anomaly cancellation among the fermion families requires one generation of quarks to transform differently from the other two under the gauge group. In the weak basis the distinction between quark families is meaningless. However, in the mass eigenstates basis, the Cabibbo-Kobayashi-Maskawa mixing matrix motivates us to classify left-handed quarks in families. In this sense there are, in principle, three different assignments of quark weak eigenstates into mass eigenstates. In this work, by using measurements at the Z-pole, atomic parity violation data and experimental input from neutral meson mixing, we examine two different models without exotic electric charges based on the 3-4-1 symmetry, and address the effects of quark family nonuniversality on the bounds on the mixing angle between two of the neutral currents present in the models and on the mass scales MZ2 and MZ3 of the new neutral gauge bosons predicted by the theory. The heaviest family of quarks must transform differently in order to keep lower bounds on MZ2 and MZ3 as low as possible without violating experimental constraints.Maestrí
Análisis de las medidas antropométricas dentales y gingivales del sector anterosuperior y su expresión estética en una población específica
No full textTesis doctoral de la Universidad Alfonso X "El sabio"- Facultad de Ciencias de la Salud- Programa de Doctorado: Nuevos retos en OdontoestomatologíaBibliografíaTesis realizada por Marta de Sebastián Ochotonera; dirigida por Dra. María Belén Centenera Centenera, Dra Sofía Hernández Montero.Programa de Doctorado en Ciencias Farmacéuticas (DFA)Facultad de Ciencias de la Salu
Justifying the Standard Model U(1) x SU(2) x SU(3) Symmetry in a Multi-fold Universe
No full text<p><em>Group theory is a good way to study Particle Physics, when all the details are not known. U(1) x SU(2) x SU(3) is a good example as the symmetry group of the Standard Model (SM). It is well established, yet it is still a mystery why these symmetries, and why not a different or bigger group. It is what motivated efforts in the direction of Grand Unification Theories (GUTs).</em></p>
<p><em>The paper starts with an analysis of multi-fold aspects inspired from the Geometric Unity (GU). The first stages of the GU approach are contrasted with the multi-fold space time matter induction approach. It leads to different ways to characterize the symmetries of the 4D spacetime in the embedding space: Two unoriented 7D space time, tagged to cover a left and a right chirality, undefined in 7D, and therefore a Spin(7,7) symmetry. Spin (7,7) can be reduced by symmetry breaking to Sl(2,</em><em>ℂ</em><em>) x U(1) x SU(2) </em><em>x</em><em> SU(3), </em><em>via a whole bunch of different paths and possible interim symmetries. The first term corresponds to General Relativity (GR) in 4D with Lorentz symmetries, while the rest are the SM symmetries associated to Quantum Physics. This 7D space, with chiral labels, is a local 7D </em><em>ε</em><em> neighborhood seen from the 4D spacetime, through multi-fold entry, exit or mapping points, locally embedding it, without Physics in it and implementing space time matter induction and scattering in the 4D multi-fold spacetime, ensuring U(1) x SU(2) </em><em>x</em><em> SU(3) for the SM, and induction of the SM particles. Indeed, the doubling of the spacetime sharing time as 7D embedding space explains the algebra doubling on non-commutative geometry in 4D that also predicts the SM particles. </em></p>
<p><em>Revisiting the multi-fold mechanisms, we explicitly detail why a multi-fold spacetime carries U(1) x SU(2) x SU(3) symmetries, in addition to Lorentz symmetry: U(1) is the symmetry of the paths on the multi-folds (as circles on the surface of 3D spheres), SU(2) is the axial symmetry of the multi-fold mechanisms, and SU(3) is the 3D symmetry for the multi-fold axis choices. These symmetries transfer to the embedding 7D space (</em><em>ε</em><em> neighborhood),generated by the multi-folds. Also, GR reigns in that space, Ricci flat or Einsteinian. This way, traversable wormholes, thanks to right-handed neutrinos, could implement multi-folds. Additional considerations on traversability of wormholes are also discussed, in particular introducing effects like Casimir without 7D Physics.</em></p>
<p><em>Explaining why SM has the symmetry that it has is quite unique. As far as we know, it has not been possible so far to derive a convincing explanation for why, larger symmetry breaking result into a remaining U(1) x SU(2) x SU(3) symmetry for the SM. Most papers either show compatibility with U(1) x SU(2) x SU(3) symmetries that are then assumed, or how larger symmetries could lead to U(1) x SU(2) x SU(3); but in general, not why this symmetry.</em></p>
<p><em>So far, the GUTs failures to provide such an explanation, made U(1) x SU(2) x SU(3) even more puzzling. Because of how tied the SM symmetries are to the multi-fold mechanisms, and the embedding </em><em>ε</em><em> space perception, it may be another hint that our universe could be well modeled with multi-folds. The absence of larger symmetries is also a way to explain why no GUTs or supersymmetry exist, and to confirm our past prediction for a fundamental particle desert above the energy scale of the multi-fold gravity electroweak symmetry breaking.</em></p>
<p><em>The symmetries of the 4D spacetime, the SM and the 7D embedding space can also become first step towards more quantitative sketches of the multi-fold action, Lagrangian or Hamiltonian.</em></p>
<p><em>A consequence of this paper is that GR, or the Hilbert Einstein action contains fully the Standard Model and therefore the Standard Model (SM) (with gravity, i.e., the SM<sub>G</sub>). And there is no need to invoke fine-tuning or multiverses to explain our universe.</em></p>Cite as: Stephane H. Maes, (2022), "Justifying the Standard Model U(1) x SU(2) x SU(3) Symmetry in a Multi-fold Universe", https://doi.org/10.5281/zenodo.8422911, https://shmaesphysics.wordpress.com/2022/08/08/justifying-the-standard-model-u1-x-su2-x-su3-symmetry-in-a-multi-fold-universe/, August 8, 2022
Providing Secure Coordinated Access to Grid Services
No full textCoordinating the cumulative use of distributed resources in a grid environment so that users do not consume too much is a difficult task. This paper presents one approach that we have implemented in Globus Toolkit version 4 (GT4), that uses an SQL database to hold coordination data, and policy decision points (PDPs) to make access control decisions about whether the users request for more resources can be granted or denied. When access is granted, obligations in the policy ensure that the coordination database is appropriately updated. In our initial implementation, the coordination service is embedded into the GT4 authorization chain as a custom PDP so that any web service can be provided with a security policy that provides a coordination capability. In the final section we describe how coordinated decision making could be more tightly integrated into a future version of GT
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