48,497 research outputs found
On the Six-dimensional Kerr Theorem and Twistor Equation
The Kerr theorem is revisited as part of the twistor program in six
dimensions. The relationship between pure spinors and integrable 3-planes is
investigated. The real condition for Lorentzian spacetimes is seen to induce a
projective property in the space of solutions, reminiscent of the quaternionic
structure of the 6-dimensional Lorentz group. The twistor equation (or Killing
spinor equations generically) also has an interpretation as integrable null
planes and a family of Einstein spacetimes with this property are presented in
the Kerr-Schild fashion.Comment: JHEP style, 19 pages, minor corrections. Matches printed versio
Signature of a Cosmic String Wake at
In this paper, we describe the results of N-body simulation runs, which
include a cosmic string wake of tension on top of the
usual fluctuations. To obtain a higher resolution of the wake in
the simulations compared to previous work, we insert the effects of the string
wake at a lower redshift and perform the simulations in a smaller volume. A
curvelet analysis of the wake and no-wake maps is applied, indicating that the
presence of a wake can be extracted at a three-sigma confidence level from maps
of the two-dimensional dark matter projection down to a redshift of .Comment: 8 pages, 6 figures; We have improved the analysis and results. The
text now agrees with the published versio
Stock selection based on cluster analysis
We put forward a technique based on cluster analysis to group stocks in spot markets according to a risk-return criterion. We show how an informed investor will make money using the cluster analysis to select stocks of major companies from North and South America.
Tourism Cluster Competitiveness and Sustainability: Proposal for a Systemic Model to Measure the Impact of Tourism on Local Development
This article proposes a model to measure tourism cluster impact on local development with a view to assessing tourism cluster interaction, competitiveness and sustainability impacts on the economy, society and the environment. The theoretical basis for this model is founded on cluster concept and typology adapting and integrating the systemic competitiveness and sustainability concepts within economic, social, cultural, environmental and political dimensions. The proposed model shows a holistic, multidisciplinary and multi-sector view of local development brought back through a systemic approach to the concepts of competitiveness, social equity and sustainability. Its results make possible strategic guidance to agents responsible for public sector tourism policies, as well as the strategies for competitiveness, competition, cooperation and sustainability in private companies and institutions
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