Browsing by Author "Miguel Guilera, Octavio"

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    Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model
    (2019) Francisco Ranea-Sandoval, Ignacio; Gabriela Orsaria, Milva; Malfatti, German; Curin, Daniela; Mariani, Mauro; Anibal Contrera, Gustavo; Miguel Guilera, Octavio
    We study local and non-local Polyakov Nambu-Jona-Lasinio models and analyze their respective phase transition diagram. We construct hybrid stars using the zero temperature limit of the local and non-local versions of Nambu-Jona-Lasinio model for quark matter and the modern GM1(L) parametrization of the non-linear relativistic mean field model for hadronic matter. We compare our models with data from PSR J1614-2230 and PSR J0343+0432 and also from GW170817 and its electromagnetic counterpart GRB170817A and AT2017gfo. We study observational signatures of the appearance of a mixed phase as a result of modeling a phase transition that mimics the Gibbs formalism and compare the results with the sharp first-order phase transition obtained using the Maxwell construction. We also study in detail the g-mode associated with discontinuities in the equation of state, and calculate non-radial oscillation modes using relativistic Cowling approximation.
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    Giant planet formation at the pressure maxima of protoplanetary disks: II. A hybrid accretion scenario
    (2020) Miguel Guilera, Octavio; Sandor, Zsolt; Paula Ronco, Maria; Venturini, Julia; Miller Bertolami, Marcelo Miguel
    Context. Recent high-resolution observations of protoplanetary disks have revealed ring-like structures that can be associated to pressure maxima. Pressure maxima are known to be dust collectors and planet migration traps. The great majority of planet formation studies are based either on the pebble accretion model or on the planetesimal accretion model. However, recent studies proposed hybrid accretion of pebbles and planetesimals as a possible formation mechanism for Jupiter.