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- Carmen Coll, Màrius J. Fullana, Elena Sánchez
- Applied Mathematics and Computation
- 2004

- Carmen Coll, Màrius J. Fullana, Elena Sánchez
- Applied Mathematics and Computation
- 2002

Many papers analyze the role of controllability and observability indices of normal linear systems in control theory and their use in the study of structural properties. This work introduces these indices for linear discrete-time descriptor systems. Such indices are studied in two different ways, by means of the state-space approach and using its transfer… (More)

The Tolman-Bondi solution of the Einstein equations is used in order to model the time evolution of the void observed in Boötes. The present density contrast of the central region (∼ −0.75) and its radius (∼ 30h−1 Mpc) are fixed, while the density parameter of the Universe, the amplitude of the density contrast inside the void wall, the width of this wall… (More)

The Tolman-Bondi solution of the Einstein equations is used in order to model the time evolution of the void observed in Boötes. The present density contrast of the central region (∼ −0.75) and its radius (∼ 30h Mpc) are fixed, while the density parameter of the Universe, the amplitude of the density contrast inside the void wall, the width of this wall and… (More)

In some scenarios, the peculiar gravitational potential of linear and mildly nonlinear structures depends on time and, as a result of this dependence, a late integrated Sachs-Wolfe effect appears. Here, an appropriate formalism is used which allows us to improve on the analysis of the spatial scales and locations of the main cosmological inhomogeneities… (More)

The Tolman-Bondi solution of the Einstein equations is used in order to model the time evolution of the void observed in Boötes. The present density contrast of the central region (∼ −0.75) and its radius (∼ 30h Mpc) are fixed, while the density parameter of the Universe, the amplitude of the density contrast inside the void wall, the width of this wall and… (More)

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