La tesis doctoral presentada por Antonio Marín, trata sobre la técnica de las fluctuaciones de brillo superficial. Se fundamenta en el estudio detallado de una fuente de varianza concreta. A partir del análisis de la varicuza se puede obtener propiedades de la población de los objetos bajo estudio. Los campos astrofísicos a los cuales se ha

We investigate the constraints on basic cosmological parameters set by the first compact-configuration observations of the Very Small Array (VSA), and other cosmological data sets, in the standard inflationary ΛCDM model. Using the weak priors 40 H0 90 km s-1 Mpc-1 and 0 τ 0.5, we find that the VSA and COBE-DMR data alone produce the

We present the power spectrum of the fluctuations in the cosmic microwave background detected by the Very Small Array (VSA) in its first season of observations in its compact configuration. We find clear detections of first and second acoustic peaks at l~ 200 and ~550, plus detection of power on scales up to l= 800. The VSA power spectrum is in

We have observed the cosmic microwave background (CMB) temperature fluctuations in eight fields covering three separated areas of sky with the Very Small Array at 34 GHz. A total area of 101 square degrees has been imaged, with sensitivity on angular scales of (equivalent to angular multipoles l= 150-900). We describe the field selection and

The Very Small Array (VSA) is a synthesis telescope designed to image faint structures in the cosmic microwave background on degree and sub-degree angular scales. The VSA has key differences from other CMB interferometers with the result that different systematic errors are expected. We have tested the operation of the VSA with a variety of blank

Anomalous moments of the top quark arises from one loop corrections to the vertices ttg and ttγ. We study these anomalous couplings in different frameworks: effective theories, Standard Model and 2HDM. We use available experimental results in order to get bounds on these anomalous couplings.