Search results for "luz"
showing 10 items of 320 documents
Cosmological perturbations in extended electromagnetism. General gauge invariant approach
2013
A certain vector-tensor (VT) theory is revisited. It was proposed and analyzed as a theory of electromagnetism without the standard gauge invariance. Our attention is first focused on a detailed variational formulation of the theory, which leads to both a modified Lorentz force and the true energy momentum tensor of the vector field. The theory is then applied to cosmology. A complete gauge invariant treatment of the scalar perturbations is presented. For appropriate gauge invariant variables describing the scalar modes of the vector field (A-modes), it is proved that the evolution equations of these modes do not involve the scalar modes appearing in General Relativity (GR-modes), which are…
Discriminating between technicolor and warped extra dimensional model viapp→ZZchannel
2009
We explore the possibility to discriminate between certain strongly coupled technicolor (TC) models and warped extra dimensional models where the standard model fields are propagating in the extra dimension. We consider a generic QCD-like TC model with running coupling as well as two TC models with walking dynamics. We argue that, due to the different production mechanisms for the lowest-lying composite tensor state in these TC theories compared to the first Kaluza-Klein graviton mode of the warped extra dimensional case, it is possible to distinguish between these models based on the angular analysis of the reconstructed longitudinal $Z$ bosons in the $pp\ensuremath{\rightarrow}ZZ\ensurema…
Bounds on Warped Extra Dimensions from a Standard Model-like Higgs Boson
2011
We point out that the discovery of a light Higgs boson in the \gamma\gamma, ZZ and WW decay channels at the LHC, with cross sections not far from the predictions of the Standard Model, would have important implications for the parameters of warped extra-dimension models. Due to loop effects of Kaluza-Klein particles, these models predict a significant reduction of the Higgs production cross section via gluon-gluon fusion, combined with an enhancement of the ratio Br(h->\gamma\gamma)/Br(h->ZZ). LHC measurements of these decays will probe Kaluza-Klein masses up to the 10 TeV range, exceeding by far the reach for direct production.
Search for large extra dimensions via single photon plus missing energy final states at s=1.96TeV
2008
Made available in DSpace on 2022-04-28T20:42:17Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-06-30 We report on a search for large extra dimensions in a data sample of approximately 1fb-1 of pp̄ collisions at s=1.96TeV. We investigate Kaluza-Klein graviton production with a photon and missing transverse energy in the final state. At the 95% C.L. we set limits on the fundamental mass scale MD from 884to 778GeV for two to eight extra dimensions. © 2008 The American Physical Society. Universidad de Buenos Aires, Buenos Aires LAFEX Centro Brasileiro de Pesquisas Físicas, Rio de Janeiro Universidade Do Estado Do Rio de Janeiro, Rio de Janeiro Universidade Federal Do ABC, Santo André In…
Stimulated Raman adiabatic passage in a $\Lambda$-system in the presence of quantum noise
2011
We exploit a microscopically derived master equation for the study of STIRAP in the presence of decay from the auxiliary level toward the initial and final state, and compare our results with the predictions obtained from a phenomenological model previously used [P. A. Ivanov, N. V. Vitanov, and K. Bergmann, Phys. Rev. A 72, 053412 (2005)]. It is shown that our approach predicts a much higher efficiency. The effects of temperature are also taken into account, proving that in b-STIRAP thermal pumping can increase the efficiency of the population transfer.
La tutela coercitiva degli illeciti contro il paesaggio: osservazioni sull'effettività della tutela a margine della stagione di riforma delle sanzion…
2007
The relevance of planning tools for the protection and enhancement of the landscape highlight the complex issue of coordination with the tools and disciplines of the environment and territorial government. The contribution aims to deepen the critical elements that appear evident in the overlapping contents of the sanctioning regimes in light of the delisting of the administrative sanctioning response administrative sanctions and and the impact on the effectiveness of coercive protection
El quiebre, la traición, una socialista en la DINA. El caso de Luz Arce
2006
En 1993 la editorial Planeta publica en Chile Elinfierno, testimonio de Luz Arce en el que detalla su itinerario desde la militancia en la izquierda socialista de los inicios de los setenta hasta la participación activa en los grupos de acción de la DINA, servicio secreto del Régimen Militar en torno al cual se articuló buena parte de la represión pinochetista. Allí Luz Arce detalla minuciosamente el proceso subjetivo que le lleva a convertirse en delato¡a de sus propios compañeros de militancia tras terribles sesiones de tornrra y eI modo en que vivió la colaboración consciente y continuada, durante más de diez años, con el organismo que la había vejado y torturado salvajemente, desempeñan…
Domani a Palermo! Politici, magistrati, massoni, rivoluzionari, intellettuali e mafiosi (1860-1880)
2009
La città degli spilli. Filosofia e arte nella prima rivoluzione industriale
2001
Il saggio indaga i rapporti complessi tra la filosofia e le arti durante la prima rivoluzione industriale inglese, soffermandosi sulle interrelazioni tra le posizioni economico-filosofiche di fine Settecento e dei primi dell’Ottocento ed i cambiamenti artistici ed urbanistici. Di fronte all’avanzare della città dell’età industriale, furono proposte e, con scarsi successi, realizzate le città utopistiche di Owen, di Fourier e di Ledoux. Inoltre, si è analizzata l’architettura panottica, elaborata da Bentham che troverà grande diffusione anche presso le carceri americane del XX secolo. Si è ragionato intorno al ruolo di Pugin all’interno del Gothic Revival, il quale propose, in opposizione al…