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17/09/2010, 14:30In the context of the loop quantum cosmology we have analyzed the evolution of the Bianchi I model in the presence of vector fields. The existence of the quantum of length changes visibly the evolution of the scale factors around the Planck scale. The finite maximal energy density epears even in the limit of vector field domination, which gives an efect of the classicall Big Bounce. In...Go to contribution page
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17/09/2010, 14:45The concept of the holographic superconductor provides an exciting and novel way of investigating high temperature superconductivity via the study of black hole physics. In this talk I will discuss recent work done by myself and collaborators in which we studied fully back-reacting, holographic superconductors in Gauss-Bonnet gravity. First, I will give a brief introduction to the subject. I...Go to contribution page
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17/09/2010, 15:00We consider the effect of trapped branes on the evolution of a test brane whose motion generates DBI inflation along a warped throat. The coupling between the inflationary brane and a trapped brane leads to the radiation of non-thermal particles on the trapped brane. We calculate the Gaussian spectrum of the radiated particles and their backreaction on the DBI motion of the inflationary brane....Go to contribution page
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17/09/2010, 15:15Power-law inflationary solutions obtained from Renormalization Group improvement of a class of f(R) theories recently studied in the context of asymptotic safety scenario are discussed. The higher-order gravity dynamics encode the dimensional scaling around the non-gaussian fixed point coming from the beta functions of a polynomial Lagrangian up to order n=8 in the scalar curvature R. By means...Go to contribution page
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17/09/2010, 15:30Bimetric theories employing a disformal transformation between matter and gravity metrics are known to be capable of producing both exactly scale-invariant as well as tilted power spectra of perturbations. I will present results for the non-Gaussian signal obtained in these scenarios, which has an amplitude smaller than that of DBI inflation (with opposite sign) but larger than standard...Go to contribution page
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17/09/2010, 15:45The existence of the effective anisotropic stress at late times, which in this case has a purely geometrical origin, seems to be a characteristic of higher order gravity models, and its detection will be a smoking gun for departures from General Relativity, for example in future weak lensing surveys. I will discuss and investigate the possibility of the existence of modified gravity models...Go to contribution page
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