Ara es mostren els items 1-10 de 10

    • Modelling relativistic effects in the light curves of tidal disruption events 

      Alsina Oriol, Júlia (Universitat Politècnica de Catalunya, 2017-04)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Center for Relativistic Astrophysics
      A star whose orbit takes it on a suffciently close approach to a massive black hole (BH) will be shredded by the black hole's tides. Accretion of stellar debris on the BH gives rise to a characteristic light curve which ...
    • Non-singular quantum improved rotating black holes and their maximal extension 

      Torres Herrera, Ramon (2017-06-01)
      Article
      Accés obert
      We add a prescription to the Newman–Janis algorithm in order to use it as a means of finding new extended rotating black hole spacetimes from static spherically symmetric ones. Then, we apply the procedure to a quantum ...
    • On regular rotating black holes 

      Torres Herrera, Ramon; Fayos Vallés, Francisco (2017-01-01)
      Article
      Accés obert
      Different proposals for regular rotating black hole spacetimes have appeared recently in the literature. However, a rigorous analysis and proof of the regularity of this kind of spacetimes is still lacking. In this note ...
    • On the interior of (quantum) black holes 

      Torres Herrera, Ramon (2013-06-20)
      Article
      Accés obert
      Different approaches to quantum gravity conclude that black holes may possess an inner horizon, in addition to the (quantum corrected) outer ‘Schwarzschild’ horizon. In this paper we assume the existence of this inner ...
    • On the quantum corrected gravitational collapse 

      Torres Herrera, Ramon; Fayos Vallés, Francisco (Elsevier, 2015-06-09)
      Article
      Accés obert
      Based on a previously found general class of quantum improved exact solutions composed of non-interacting (dust) particles, we model the gravitational collapse of stars. As the modeled star collapses a closed apparent ...
    • Particle production from marginally trapped surfaces of general spacetimes 

      Senovilla, José MM; Torres Herrera, Ramon (2015-03-26)
      Article
      Accés obert
      We provide a general formalism that allows to analyze the phenomenon of tunneling in arbitrary spacetimes. We show that a flux of particles produced by tunneling through general marginally trapped surfaces may be perceived ...
    • Primordial black holes capture by stars and induced collapse to low-mass stellar black holes 

      Oncins Marco, Gerard; Miralda Escudé, Jordi; Gutiérrez Cabello, Jordi; Gil Pons, Pilar (Oxford University Press, 2022-10-04)
      Article
      Accés obert
      Primordial black holes in the asteroid-mass window, which might constitute all the dark matter, can be captured by stars when they traverse them at low enough velocity. After being placed on a bound orbit during star ...
    • Singularity free gravitational collapse in an effective dynamical quantum spacetime 

      Torres Herrera, Ramon; Fayos Vallés, Francisco (Elsevier, 2014-05-05)
      Article
      Accés obert
      We model the gravitational collapse of heavy massive shells including its main quantum corrections. Among these corrections, quantum improvements coming from Quantum Einstein Gravity are taken into account, which provides ...
    • Singularity-free gravitational collapse and asymptotic safety 

      Torres Herrera, Ramon (Elsevier, 2014-06-02)
      Article
      Accés obert
      A general class of quantum improved stellar models with interiors composed of non-interacting (dust) particles is obtained and analyzed in a framework compatible with asymptotic safety. First, the effective exterior, based ...
    • The mechanism why colliders could create quasi-stable black holes 

      Torres Herrera, Ramon; Fayos Vallés, Francisco; Lorente Espín, Oscar (2013-09-09)
      Article
      Accés obert
      It has been postulated that black holes could be created in particle collisions within the range of the available energies for nowadays colliders (LHC). In this paper we analyze the evaporation of a type of black holes ...