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- Miguel Alcubierre, Gabrielle Allen, +17 authors Ryoji Takahashi
- 2008

Miguel Alcubierre, Gabrielle Allen, Carles Bona, David Fiske, Tom Goodale, F. Siddhartha Guzmán, Ian Hawke, Scott H. Hawley, Sascha Husa, Michael Koppitz, Christiane Lechner, Denis Pollney, David Rideout, Marcelo Salgado, Erik Schnetter, Edward Seidel, Hisa-aki Shinkai, Deirdre Shoemaker, Béla Szilágyi, Ryoji Takahashi, and Jeff Winicour 2 (Mexico Numerical… (More)

- Ulises Nucamendi, Marcelo Salgado
- 2006

A numerical analysis shows that a class of scalar-tensor theories of gravity with a scalar field minimally and nonminimally coupled to the curvature allows static and spherically symmetric black hole solutions with scalar-field hair in asymptotically flat spacetimes. In the limit when the horizon radius of the black hole tends to zero, regular scalar… (More)

- Marcelo Salgado, David Martı́nez-del Rı́o, Miguel Alcubierre
- 2008

Two first order strongly hyperbolic formulations of scalar-tensor theories of gravity allowing nonminimal couplings (Jordan frame) are presented along the lines of the 3 1 decomposition of spacetime. One is based on the Bona-Massó formulation, while the other one employs a conformal decomposition similar to that of Baumgarte-Shapiro-Shibata-Nakamura. A… (More)

- Marcelo Salgado
- 2006

Under certain conditions imposed on the energy-momentum tensor, a theorem that characterizes a two-parameter family of static and spherically symmetric solutions to Einstein’s field equations (black holes), is proved. A discussion on the asymptotics, regularity, and the energy conditions is provided. Examples that include the best known exact solutions… (More)

- Marcelo Salgado, Daniel Sudarsky, Ulises Nucamendi
- 2004

abstract It was recently shown by Whinnett & Torres (2004) that the phenomenon of spontaneous scalarization (SC) in compact objects (polytropes) was accompanied also by a spontaneous violation of the weak energy condition (WEC). They claimed that this violation was generic of scalar tensor theories of gravity (STT). Here we argue that this is not the case.… (More)

Miguel Alcubierre, Alejandro Corichi, José A. González, Daŕıo Núñez, Bernd Reimann, 3 and Marcelo Salgado Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A.P. 70-543, México D.F. 04510, México Theoretical Physics Institute, University of Jena, Max-Wien-Platz 1, 07743, Jena, Germany Max Planck Institut für Gravitationsphysik, Albert… (More)

- Pierre Besson, Constanza Muñoz, Gonzalo Ramírez-Sagner, Marcelo Salgado, Rodrigo A. Escobar, Werner J Platzer
- IEEE Journal of Photovoltaics
- 2017

The effect of soiling on PV systems impacts negatively the energy production. This phenomenon is highly dependant on the environmental context and conditions of operation. Indeed dirt, dust, and other air contaminants are site-specific and their accumulation on PV modules depends on the installation configuration. This study, conducted in Santiago de Chile… (More)

There are many indications that ordinary matter represents only a tiny fraction of the matter content of the Universe, with the remainder assumed to consist of some different type of matter, which, for various reasons must be nonluminous (dark matter). Among these indications are the inflationary scenarios which predicts that the average energy density of… (More)

We analyze the observational constraints on the effective Brans-Dicke parameter and on the temporal variation of the effective gravitational constant within the context of the oscillating G model, a cosmological model based on a massive scalar field non-minimally coupled to gravity. We show that these local constraints cannot be satisfied simultaneously… (More)

Marcelo Salgado, Daniel Sudarsky Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México Apdo. Postal 70-543 México 04510 D.F, México and Ulises Nucamendi Departamento de F́ısica Centro de Investigación y de Estudios Avanzados del I.P.N. A. P. 14-741, México, D. F. 07000, México. Abstract We study in the physical frame the phenomenon of… (More)