The Emergent Universe scheme and Tunneling

We present an alternative scheme for an Emergent Universe scenario, developed previously in $Phys.\ Rev.\ D {\bf 86}, 083524 (2012)$, where the universe is initially in a static state supported by a scalar field located in a false vacuum. The universe begins to evolve when, by quantum tunneling, the scalar field decays into a state of true vacuum. The Emergent Universe models are interesting since they provide specific examples of non-singular inflationary universes.Comment: 10 pages, 6 figures. Talk given at the 2nd Russian-Spanish meeting on particle physics at all scales, Saint Petersburg (Russia), October 201

Classically and Quantum stable Emergent Universe from Conservation Laws

It has been recently pointed out by Mithani-Vilenkin that certain emergent universe scenarios which are classically stable are nevertheless unstable semiclassically to collapse. Here, we show that there is a class of emergent universes derived from scale invariant two measures theories with spontaneous symmetry breaking (s.s.b) of the scale invariance, which can have both classical stability and do not suffer the instability pointed out by Mithani-Vilenkin towards collapse. We find that this stability is due to the presence of a symmetry in the "emergent phase", which together with the non linearities of the theory, does not allow that the FLRW scale factor to be smaller that a certain minimum value $a_0$ in a certain protected region.Comment: 18 pages, 10 figures, typos corrected, some improvements in the text and comments added in conclusions. Two new appendices, references added. Accepted for publication in JCAP. arXiv admin note: text overlap with arXiv:1105.065

Marcos de Modelado en la Ingenieria del Conocimiento, CommonKADS y el Diseno de un Sistema para Nutricion y Dietetica.

El presente trabajo presenta un estudio sobre el estado del arte de los marcos de modelado mas evolucionados en el area de la Ingenieria del Conocimiento, para lo cual se presenta una sintesis de su evolucion historica y una comparacion entre las principales metodologias (CommonKADS, PROTEGE-II, MIKE, VITAL, KSM, IBROW3/UPML). Eligiendo a CommonKADS y complementandolo con UML se diseno un sistema para nutricion y dietetica