Browsing by Autor "Juan Carlos Sanabria"

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    High energy neutrinos from choked GRBs and their flavor ratio measurement by the IceCube
    (Springer Science+Business Media, 2015) K. Varela; Sarira Sahu; Andrés Felipe Osorio Oliveros; Juan Carlos Sanabria
    The high energy neutrinos produced in a choked gamma-ray burst can undergo matter oscillation before emerging out of the stellar envelope. Before reaching the detector on Earth, these neutrinos can undergo further vacuum oscillation and then Earth matter oscillation when crossing the diameter of the Earth. In the context of IceCube we study the Earth matter effect on neutrino flux in the detector. For the calculation of the track-to-shower ratio R in the IceCube, we have included the shadowing effect and the additional contribution from the muon track produced by the high energy tau lepton decay in the vicinity of the detector. We observed that R is different for different CP phases in vacuum but the matter effect suppresses these differences. We have also studied the behavior of R when the spectral index $$\alpha $$ varies.
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    Virial theorem and gravitational equilibrium with a cosmological constant
    (2001) M. Nowakowski; Juan Carlos Sanabria; A. Garcı́a
    Starting from the Newtonian limit of Einstein's equations in the presence of a positive cosmological constant, we obtain a new version of the virial theorem and a condition for gravitational equilibrium. Such a condition takes the form ρ > λρvac, where ρ is the mean density of an astrophysical system (e.g. galaxy, galaxy cluster or supercluster), λ is a quantity which depends only on the shape of the system, and ρvac is the vacuum density. We conclude that gravitational stability might be infiuenced by the presence of Λ depending strongly on the shape of the system.