66,363 research outputs found
Analysis of Vector-Inflation Models Using Dynamical Systems
We analyze two possible vector-field models using the techniques of dynamical
systems. The first model involves a U(1)-vector field and the second a triad of
SU(2)-vector fields. Both models include a gauge-fixing term and a power-law
potential. A dynamical system is formulated and it is found that one of the
critical points, for each model, corresponds to inflation, the origin of these
critical points being the respective gauge-fixing terms. The conditions for the
existence of an inflationary era which lasts for at least 60 efolds are
studied.Comment: LaTeX file in elsarticle style, 4 pages, 1 figure. To be published in
Nuclear Physics B Proceedings Supplement as the proceedings of the Tenth
Latin American Symposium on High Energy Physics (Medellin - Colombia,
24th-28th November, 2014
Quantum coherence, correlated noise and Parrondo games
We discuss the effect of correlated noise on the robustness of quantum
coherent phenomena. First we consider a simple, toy model to illustrate the
effect of such correlations on the decoherence process. Then we show how
decoherence rates can be suppressed using a Parrondo-like effect. Finally, we
report the results of many-body calculations in which an
experimentally-measurable quantum coherence phenomenon is significantly
enhanced by non-Markovian dynamics arising from the noise source.Comment: 8 page
Creation of blenders in the conservative setting
In this work we prove that each C^r conservative diffeomorphism with a pair
of hyperbolic periodic points of co-index one can be C^1-approximated by C^r
conservative diffeomorphisms having a blender.Comment: 4 figures, 16 figure
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