43,657 research outputs found
Local supersymmetry in supergravity
We have studied the local supersymmetry in two D = 4 supergravity models, with
N = 1 and N = 2, given the Lagrangians. We have used a simple method based on
the differential of the action H, which provides an alternative systematic derivation of
the gauge field variations in the first order formalism. This method may be used to find
non-relativistic limits of supergravity models.Departamento de Física Teórica, Atómica y ÓpticaMáster en Físic
Functions and differentials on the non-split Cartan modular curve of level 11
The genus 4 modular curve Xns(11) attached to a non-split Cartan group of level 11
admits a model defined over Q. We compute generators for its function field in terms of
Siegel modular functions. We also show that its Jacobian is isomorphic over Q to the new
part of the Jacobian of the classical modular curve X0(121)Postprint (author's final draft
Bares 2.0 wave buoy and sustainable buoy network
The aim of this article is to show the operation of the Bares 2.0 wave buoy
and the Bares network developed by HCTech. In the marine sector it is highly important
to know the state of the sea for applications such as the construction of ports,
the study of the impact of waves in coastal areas, the development and calibration
of forecasting wave models, the knowledge of the state of the maritime navigation
channels, etc. Some of the great difficulties that exist in order to obtain the information
of ocean waves is the high cost of the buoys, installation and maintenance. The
Bares network aims to cover areas of high oceanographic interest, the target is a
sustainable network of buoys that facilitate the access to wave data. The features
of this network are the optimized cost, high reliability and reduced maintenance.Peer Reviewe
Computation of numerical semigroups by means of seeds
For the elements of a numerical semigroup which are larger than the Frobenius
number, we introduce the definition of, seed, by broadening the notion of
generator. This new concept allows us to explore the semigroup tree in an
alternative efficient way, since the seeds of each descendant can be easily
obtained from the seeds of its parent. The paper is devoted to presenting the
results which are related to this approach, leading to a new algorithm for
computing and counting the semigroups of a given genus
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