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Autor Cruz Dombriz, Álvaro de la |
Documentos disponibles escritos por este autor (40)
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Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2008-06In the context of f(R) theories of gravity, we study the evolution of scalar cosmological perturbations in the metric formalism. Using a completely general procedure, we find the exact fourth-order differential equation for the matter density pe[...]![]()
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In this work we consider the possibility of describing the current evolution of the universe, without the introduction of any cosmological constant or dark energy (DE), by modifying the Einstein-Hilbert (EH) action. In the context of the f(R) gr[...]![]()
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Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; Lineros, R. ; López Maroto, Antonio | IOP publishing ltd | 2011Annihilation of different dark matter (DM) candidates into Standard Model (SM) particles could be detected through their contribution to the gamma ray fluxes that are measured on the Earth. The magnitude of such contributions depends on the part[...]![]()
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Albareti, F. D. ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la | IOP Publishing | 2012-12-14We study the accelerated expansion of the Universe through its consequences on a congruence of geodesics. We make use of the Raychaudhuri equation which describes the evolution of the expansion rate for a congruence of timelike or null geodesics[...]![]()
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Weltman, A. ; Bull, P. ; Camera, S. ; Kelley, K. ; Padmanabhan, H. ; Pritchard, J. ; Raccanelli, A. ; Riemer-Sorensen, S. ; Shao, L. ; Andrianomena, S. ; Athanassoula, E. ; Bacon, D. ; Barkana, R. ; Bertone, G. ; Boehm, C. ; Bonvin, C. ; Bosma, A. ; Brueggen, M. ; Burigana, C. ; Calore, F. ; Ruiz Cembranos, José Alberto ; Clarkson, C. ; Connors, R. M. T. ; Cruz Dombriz, Álvaro de la ; Dunsby, P. K. S. ; Fonseca, J. ; Fornengo, N. ; Gaggero, D. ; Harrison, I. ; Larena, J. ; Ma, Y-Z. ; Maartens, R. ; Mendez Isla, M. ; Mohanty, S. D. ; Murray, S. ; Parkinson, D. ; Pourtsidou, A. ; Quinn, P. J. ; Regis, M. ; Saha, P. ; Sakellariadou, M. ; Silk, J. ; Trombetti, T. ; Vazza, F. ; Venumadhav, T. ; Vidotto, F. ; Villaescusa Navarro, F. ; Wang, Y. ; Weniger, C. ; Wolz, L. ; Zhang, F. ; Gaensler, B. M. | Cambridge Univ Press | 2020The Square Kilometre Array (SKA) is a planned large radio interferometer designed to operate over a wide range of frequencies, and with an order of magnitude greater sensitivity and survey speed than any current radio telescope. The SKA will add[...]![]()
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Gammaldi, Viviana ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Lineros, Roberto A. ; López Maroto, Antonio | Elsevier | 2015We present a study of the Galactic Center region as a possible source of both secondary gamma-ray and neutrino fluxes from annihilating dark matter. We have studied the gamma-ray flux observed by the High Energy Stereoscopic System (HESS) from t[...]![]()
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Gammaldi, Viviana ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Lineros, R.A. ; López Maroto, Antonio | Elsevier | 2015We present a study of the Galactic Center region as a possible source of both secondary gamma-ray and neutrino fluxes from annihilating dark matter. We have studied the gamma-ray flux observed by the High Energy Stereoscopic System (HESS) from t[...]![]()
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Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Montes Núñez, Bárbara | IOP Publishing | 2012-04We study the gravitational collapse in modified gravitational theories. In particular, we analyze a general f(R) model with uniformly collapsing cloud of self-gravitating dust particles. This analysis shares analogies with the formation of large[...]![]()
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López Maroto, Antonio ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Gammaldi, Viviana | Amer Inst Physics | 2012If the present dark matter in the Universe annihilates into Standard Model particles, it must contribute to the gamma ray fluxes detected on the Earth. Here we briefly review the present constraints for the detection of gamma ray photons produce[...]![]()
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Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2008-10One of the most striking features found in the cosmic microwave background data is the presence of an anomalous cold spot (CS) in the temperature maps made by the Wilkinson Microwave Anisotropy Probe (WMAP). This CS has been interpreted as the r[...]![]()
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Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dobado González, Antonio ; López Maroto, Antonio | IOP publishing ltd | 2008-10One of the most striking features found in the cosmic microwave background data is the presence of an anomalous cold spot (CS) in the temperature maps made by the Wilkinson Microwave Anisotropy Probe (WMAP). This CS has been interpreted as the r[...]![]()
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In the context of f(R) modified gravity theories, we study the Kerr-Newman black hole solutions. We study nonzero constant scalar curvature solutions and discuss the metric tensor that satisfies the modified field equations. We conclude that, in[...]![]()
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Abebe, Amare ; Cruz Dombriz, Álvaro de la ; Dunsby, Peter K. S. | American Physical Society | 2013-08-26Over the past few years much attention has been given to the study of modified gravity theories in order to find a more natural explanation for the late time acceleration of the Universe. Nevertheless, a comparison of the matter power spectrum p[...]![]()
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Jimeno Romero, Pablo ; Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la | American Institute of Physics | 2012-07In the context of f(R) modified gravity theories we determine that the black holes existence is determined by the sign of a parameter dependent of the mass, the charge, the spin and the scalar curvature. We obtain the different astrophysical obj[...]![]()
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Aparicio Resco, Miguel ; Cruz Dombriz, Álvaro de la ; Llanes Estrada, Felipe José ; Zapatero Castrillo, Víctor | Elsevier B.V. | 2016-09In the context of f(R) gravity theories, we show that the apparent mass of a neutron star as seen from an observer at infinity is numerically calculable but requires careful matching, first at the star’s edge, between interior and exterior solut[...]