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Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Dunsby, Dunsby ; Méndez-Isla, Miguel | Elsevier Science BV | 2019-03-10In the context of brane-world extra-dimensional theories, we compute the positron production from branon dark matter annihilations and compare with the AMS-02 data. Three different scenarios have been considered; the first two assume that either[...]texto impreso
The center of our Galaxy is a complex region characterized by extreme phenomena. The presence of the supermassive Sagittarius A* black hole, a high dark matter density and an even higher baryonic density are able to produce very energetic proces[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2002-01-15In the context of a brane world and including an induced curvature term in the brane action, we obtain the effective Lagrangian for the Goldstone bosons (branons) associated with the spontaneous breaking of the translational invariance in the bu[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2003-07-20We show that, in the context of brane-world scenarios with low tension [tau]=f^4, massive brane fluctuations (branons) are natural dark matter candidates. We calculate the present abundances for both hot (warm) and cold branons in terms of the b[...]texto impreso
Ruiz Cembranos, José Alberto ; Delgado López, Rafael ; Dobado González, Antonio | American Physical Society | 2013-10-29We explore the viscosities of a photon gas by means of the Euler-Heisenberg effective theory and quantum electrodynamics at zero electron chemical potential. We find parametric estimates that show a very large shear viscosity and an extremely sm[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | World Scientific Publ Co Pte Ltd | 2005This is a brief introduction to branon physics and its role in the dark matter problem. We pay special attention to the phenomenological consequences, both in high-energy particle physics experiments and in astrophysical and cosmological observa[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | Amer Physical Soc | 2006-02In the context of brane-world scenarios, we study the effects produced by the exchange of virtual massive branons. A one-loop calculation is performed which generates higher-dimensional operators involving SM fields suppressed by powers of the b[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2004-11In the context of the brane-world scenarios with compactified extra dimensions, we study the production of brane fluctuations (branons) in hadron colliders (p (p) over bar, pp, and e(+/-)p) in terms of the brane tension parameter f, the branon m[...]texto impreso
Ruiz Cembranos, José Alberto ; Cruz Dombriz, Álvaro de la ; Olano Garcia, Leandro | American Physical Society | 2013-12-15In the context of scalar-tensor theories we study the evolution of the density contrast for Jordan-Fierz-Brans-Dicke theories in a Friedmann-Lemaitre-Robertson-Walker universe. Calculations are performed in the Einstein frame with the cosmologic[...]texto impreso
Ruiz Cembranos, José Alberto ; López Maroto, Antonio ; Núñez Jareño, S.J. ; Villarrubia-Rojo, H. | Springer | 2018-08-14he cold dark matter (CDM) scenario has proved successful in cosmology. However, we lack a fundamental understanding of its microscopic nature. Moreover, the apparent disagreement between CDM predictions and subgalactic-structure observations has[...]texto impreso
We study different phenomenological signatures associated with new spin-2 particles. These new degrees of freedom, that we call hidden gravitons, arise in different high-energy theories such as extra-dimensional models or extensions of General R[...]texto impreso
In the framework of Einstein-Yang-Mills theories, we study the gauge Lorentz group and establish a particular correspondence between this case and a certain class of theories with torsion within RiemannCartan space-times. This relation is specia[...]texto impreso
Ruiz Cembranos, José Alberto ; Dobado González, Antonio ; López Maroto, Antonio | American Physical Society | 2003-11We consider a general brane-world model parametrized by the brane tension scale f and the branon mass M. For a low tension compared to the fundamental gravitational scale, we calculate the relic branon abundance and its contribution to the cosmo[...]texto impreso
Ruiz Cembranos, José Alberto ; López Maroto, Antonio ; Núñez Jareño, Santos José | Springer | 2016-03-03The fact that fast oscillating homogeneous scalar fields behave as perfect fluids in average and their intrinsic isotropy have made these models very fruitful in cosmology. In this work we will analyse the perturbations dynamics in these theorie[...]texto impreso
We discuss the possibility of observing CPT violation from top antitop production in hadronic colliders. We study a general approach by analyzing constraints on the mass difference between the top and anti-top quarks. We present current bounds f[...]
