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Search Results: 1 - 10 of 319 matches for " Berenstein Isidoro "
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Problemas Familiares Contemporaneos o Situaciones Familiares Actuales: Invariancia y Novedad
Berenstein, Isidoro;
Psicologia USP , 2002, DOI: 10.1590/S0103-65642002000200003
Abstract: the author starts by asking himself whether the family is relevant nowadays. to answer this question he analyzes the couple's relationship with each other and with their children, placing these relationships historically. it is suggested that the "familial problems" come to being when a certain pattern of family becomes standard. those families which do not follow this pattern are then called "problematic". for that reason, the author prefers to make reference to different "familial situations". these are thought from a double perspective: the invariance which also refers to a sort of evolution, or the novelty which, as a contrast, relates to rupture and re-composition. three areas of familial situations are then distinguished: those which come from their familial relationships, from the social world and from each subject (as the variations from his/her internal world affect his/her familial bonds). at last, the author asks himself if the new familial forms really answer to the production of novelty and if this novelty relates to its shape or structure. he concludes that the family is not new nor old, but that it does something new or not. the analysis of the family should include an analysis of the making in its bounds and of the consequences of this making.
Problemas Familiares Contemporaneos o Situaciones Familiares Actuales: Invariancia y Novedad
Berenstein Isidoro
Psicologia USP , 2002,
Abstract: O autor inicia por perguntar-se sobre a relevancia da família na atualidade. Para responder esta quest o, examina os vínculos de casal e de rela o entre pais e filhos, situando-os historicamente. Sugere que os "problemas familiares" instauram-se a partir do momento em que se institui uma forma de família como oficial, sendo "problemas" as que n o seguem esse modelo. Por isto, prefere referir-se a diferentes "situa es familiares", que passam a ser pensadas a partir da crítica de dois critérios: o de invariancia, evolu o de formas anteriores, ou de novidade, ruptura e recomposi o. Distingue três áreas das situa es familiares que podem ser examinadas de acordo com estes critérios: aquelas provenientes das rela es familiares, do mundo social e de cada sujeito, das varia es de seu mundo interno que produzem efeitos nos vínculos familiares. Por fim, o autor pergunta-se se as novas formas familiares respondem realmente à produ o de uma novidade e se esta novidade é de forma ou de estrutura. Conclui que a família n o é nova ou velha, mas faz algo novo ou n o. A análise da família deve incluir uma análise do fazer em seus vínculos e das conseqüências desse fazer.
What Controls Recent Changes in the Circulation of the Southern Hemisphere: Polar Stratospheric or Equatorial Surface Temperatures?  [PDF]
Isidoro Orlanski
Atmospheric and Climate Sciences (ACS) , 2013, DOI: 10.4236/acs.2013.34052
Abstract:

Recent research suggests that both tropical ocean warming and stratospheric temperature anomalies due to ozone depletion have led to a poleward displacement of the midand high-latitude circulation of the Southern Hemisphere over the past century. In this study, we attempt to distinguish the influences of ocean warming and stratospheric cooling trends on seasonal changes of both the zonally symmetric and asymmetric components of the southern hemisphere circulation. Our analysis makes use of three data sets-the ERA40 reanalysis and results from two different runs of the GFDL global atmosphere and land model (AM2.1) for the period 1870 to 2004. A regression analysis was applied to two variables in each of the three data sets-the zonal component of the surface wind U(10 m) and the height at 300 hPato determine their correlation with zonally averaged polar stratospheric temperatures (T_polarat 150 hPa, averaged over a band from 70S - 80S) and low-level equatorial temperatures (T_equatorat 850 hPa averaged over a band at 5S - 5N). Our analysis shows that the zonally symmetric surface winds have a considerably enhanced intensity in high latitudes of the

Reverse geometric engineering of singularities
David Berenstein
Physics , 2002, DOI: 10.1088/1126-6708/2002/04/052
Abstract: One can geometrically engineer supersymmetric field theories theories by placing D-branes at or near singularities. The opposite process is described, where one can reconstruct the singularities from quiver theories. The description is in terms of a noncommutative quiver algebra which is constructed from the quiver diagram and the superpotential. The center of this noncommutative algebra is a commutative algebra, which is the ring of holomorphic functions on a variety V. If certain algebraic conditions are met, then the reverse geometric engineering produces V as the geometry that D-branes probe. It is also argued that the identification of V is invariant under Seiberg dualities.
Solving matrix models using holomorphy
David Berenstein
Physics , 2003, DOI: 10.1088/1126-6708/2003/06/019
Abstract: We investigate the relationship between supersymmetric gauge theories with moduli spaces and matrix models. Particular attention is given to situations where the moduli space gets quantum corrected. These corrections are controlled by holomorphy. It is argued that these quantum deformations give rise to non-trivial relations for generalized resolvents that must hold in the associated matrix model. These relations allow to solve a sector of the associated matrix model in a similar way to a one-matrix model, by studying a curve that encodes the generalized resolvents. At the level of loop equations for the matrix model, the situations with a moduli space can sometimes be considered as a degeneration of an infinite set of linear equations, and the quantum moduli space encodes the consistency conditions for these equations to have a solution.
D-brane realizations of runaway behavior and moduli stabilization
David Berenstein
Physics , 2003,
Abstract: In this paper we find examples of moduli stabilization and runaway behavior which can be treated exactly. This is shown for supersymmetric field theories which can be realized on the world volume of D-branes. From a geometric point of view, these field theories lift moduli spaces of vacua by deforming lines of singularities where supersymmetric fractional branes can be located in the geometry without D-branes.
A matrix model for a quantum hall droplet with manifest particle-hole symmetry
David Berenstein
Physics , 2004, DOI: 10.1103/PhysRevD.71.085001
Abstract: We find that a gauged matrix model of rectangular fermionic matrices (a matrix version of the fermion harmonic oscillator) realizes a quantum hall droplet with manifest particle-hole symmetry. The droplet consists of free fermions on the topology of a sphere. It is also possible to deform the Hamiltonian by double trace operators, and we argue that this device can produce two body potentials which might lead the system to realize a fractional quantum hall state on the sphere. We also argue that a single gauged fermionic quantum mechanics of hermitian matrices realizes a droplet with an edge that has $c=1/2$ CFT on it.
On the universality class of the conifold
David Berenstein
Physics , 2001, DOI: 10.1088/1126-6708/2001/11/060
Abstract: The possibility of having discrete degrees of freedom at singularities associated to `conifolds with discrete torsion' is studied. We find that the field theory of D-brane probes near these singularities is identical to ordinary conifolds, so that there are no additional discrete degrees of freedom located at the singularity. We shed light on how the obstructions to resolving the singularity are global topological issues rather that local obstrucions at the singularity itself. We also analyze the geometric transitions and duality cascades when one has fractional branes at the singularity and compute the moduli space of an arbitrary number of probes in the geometry. We provide some evidence for a conjecture that there are no discrete degrees of freedom localized at any Calabi-Yau singularity that can not be guessed from topological data away from the singularity.
Lessons in quantum gravity from quantum field theory
David Berenstein
Physics , 2010, DOI: 10.1063/1.3531637
Abstract: This paper reviews advances in the understanding of quantum gravity based on field theory calculations in the AdS/CFT correspondence.
Quantum moduli spaces from matrix models
David Berenstein
Physics , 2002, DOI: 10.1016/S0370-2693(02)03154-4
Abstract: In this paper we show that the matrix model techniques developed by Dijkgraaf and Vafa can be extended to compute quantum deformed moduli spaces of vacua in four dimensional supersymmetric gauge theories. The examples studied give the moduli space of a bulk D-brane probe in geometrically engineered theories, in the presence of fractional branes at singularities.
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