Experience with the Open Source based implementation for ATLAS Conditions Data Management System

Conditions Data in high energy physics experiments is frequently seen as every data needed for reconstruction besides the event data itself. This includes all sorts of slowly evolving data like detector alignment, calibration and robustness, and data from detector control system. Also, every Conditions Data Object is associated with a time interval of validity and a version. Besides that, quite often is useful to tag collections of Conditions Data Objects altogether. These issues have already been investigated and a data model has been proposed and used for different implementations based in commercial DBMSs, both at CERN and for the BaBar experiment. The special case of the ATLAS complex trigger that requires online access to calibration and alignment data poses new challenges that have to be met using a flexible and customizable solution more in the line of Open Source components. Motivated by the ATLAS challenges we have developed an alternative implementation, based in an Open Source RDBMS. Several issues were investigated land will be described in this paper: -The best way to map the conditions data model into the relational database concept considering what are foreseen as the most frequent queries. -The clustering model best suited to address the scalability problem. -Extensive tests were performed and will be described. The very promising results from these tests are attracting the attention from the HEP community and driving further developments.Comment: 8 pages, 4 figures, 3 tables, conferenc

Noncommutative Particles in Curved Spaces

We present a formulation in a curved background of noncommutative mechanics, where the object of noncommutativity $\theta^{\mu\nu}$ is considered as an independent quantity having a canonical conjugate momentum. We introduced a noncommutative first-order action in D=10 curved spacetime and the covariant equations of motions were computed. This model, invariant under diffeomorphism, generalizes recent relativistic results.Comment: 1+15 pages. Latex. New comments and results adde

Quantum complex scalar fields and noncommutativity

In this work we analyze complex scalar fields using a new framework where the object of noncommutativity $\theta^{\mu\nu}$ represents independent degrees of freedom. In a first quantized formalism, $\theta^{\mu\nu}$ and its canonical momentum $\pi_{\mu\nu}$ are seen as operators living in some Hilbert space. This structure is compatible with the minimal canonical extension of the Doplicher-Fredenhagen-Roberts (DFR) algebra and is invariant under an extended Poincar\'e group of symmetry. In a second quantized formalism perspective, we present an explicit form for the extended Poincar\'e generators and the same algebra is generated via generalized Heisenberg relations. We also introduce a source term and construct the general solution for the complex scalar fields using the Green's function technique.Comment: 13 pages. Latex. Final version to appear in Physical Review

Hamiltonian embedding of the massive noncommutative U(1) theory

We show that the massive noncommutative U(1) can be embedded in a gauge theory by using the BFFT Hamiltonian formalism. By virtue of the peculiar non-Abelian algebraic structure of the noncommutative massive U(1) theory, several specific identities involving Moyal commutators had to be used in order to make the embedding possible. This leads to an infinite number of steps in the iterative process of obtaining first-class constraints. We also shown that the involutive Hamiltonian can be constructed.Comment: 8 pages, Revtex (multicol

O uso do motor stirling no ensino de termodinâmica : uma estratégia metodológica

Neste trabalho propomos a utilização do motor Stirling de forma contextualizada, em aulas de Física, no Ensino Médio, mediante uma estratégia metodológica fundamentada na teoria de Ausubel, a partir dos subsunçores presentes na estrutura cognitiva dos estudantes. Nessa perspectiva, sugerimos uma abordagem que utilize questionamentos que possam viabilizar o ancoramento dos novos conhecimentos nos referidos subsunçores, tornando-os mais elaborados. Com isso, acreditamos que essa estratégia pode facilitar a aprendizagem significativa do ciclo de Carnot, bem como o tratamento dos aspectos sócio-ambientais relacionados ao motor Stirling

O uso do motor stirling no ensino de termodinâmica : uma estratégia metodológica

Neste trabalho propomos a utilização do motor Stirling de forma contextualizada, em aulas de Física, no Ensino Médio, mediante uma estratégia metodológica fundamentada na teoria de Ausubel, a partir dos subsunçores presentes na estrutura cognitiva dos estudantes. Nessa perspectiva, sugerimos uma abordagem que utilize questionamentos que possam viabilizar o ancoramento dos novos conhecimentos nos referidos subsunçores, tornando-os mais elaborados. Com isso, acreditamos que essa estratégia pode facilitar a aprendizagem significativa do ciclo de Carnot, bem como o tratamento dos aspectos sócio-ambientais relacionados ao motor Stirling