Now showing items 1-18 of 18

  • An approach to evaporating stars and black holes 

    Fayos Vallés, Francisco; Torres Herrera, Ramon (2011-09-01)
    Article
    Open Access
    Many models in which the object under study loses all its mass have appeared in the literature. No doubt, the most eminent examples are the models for evaporating black holes and for evaporating stars. Here we describe ...
  • Corrigendum: particle production from marginally trapped surfaces of general spacetimes 

    Senovilla, José MM; Torres Herrera, Ramon (2015-08-24)
    Article
    Open Access
    We correct some computations presented in section 4.2 of the article (Class. Quantum Grav. {\bf 32} (2015) 085004), concerning the Kerr-Vaidya space-time. The correct, new results, do support the claims in the paper.
  • Física aplicada al càlcul estructural arquitectònic 

    Fayos Vallés, Francisco; Torres Herrera, Ramon (Universitat Politècnica de Catalunya. Iniciativa Digital Politècnica, 2017)
    Book
    Restricted access to the UPC academic community
    En aquest llibre s’ofereix una introducció moderna al càlcul estructural. Es pretén que les noves generacions d’arquitectes coneguin des dels primers cursos, d’una banda, els fonaments de la ciència que són aplicables a ...
  • Local behaviour of evaporating stars and black holes around the total evaporation event 

    Fayos Vallés, Francisco; Torres Herrera, Ramon (2010-06-21)
    Article
    Open Access
  • Mechanism of quasistabilization of primordial black holes 

    Torres Herrera, Ramon (2013-06-17)
    Article
    Open Access
    It is argued that primordial black holes with initial masses satisfying M<1015 g, instead of having explode, might currently be in a quasistable phase contributing to a tiny fraction of the measured dark matter. This ...
  • Nonsingular black holes, the cosmological constant and asymptotic safety 

    Torres Herrera, Ramon (2017-06-05)
    Article
    Open Access
    Quantum gravitational effects in black hole spacetimes with a cosmological constant ¿ are considered. The effective quantum spacetimes for the black holes are constructed by taking into account the renormalization group ...
  • Nonsingular black holes, the cosmological constant, and asymptotic safety 

    Torres Herrera, Ramon (2017-07-15)
    Article
    Open Access
    Quantum gravitational effects in black hole spacetimes with a cosmological constant ¿ are considered. The effective quantum spacetimes for the black holes are constructed by taking into account the renormalization group ...
  • Non-singular quantum improved rotating black holes and their maximal extension 

    Torres Herrera, Ramon (2017-06-01)
    Article
    Open Access
    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 how energy conservation might prevent black hole explosions and violations of the third law 

    Torres Herrera, Ramon; Fayos Vallés, Francisco (2013-11-12)
    Article
    Open Access
    We claim that imposing energy conservation to the emission of Hawking radiation and to the modeling of black hole (BH) evaporation might prevent BH explosions as well as violations of the third law of BH thermodynamics. ...
  • On regular rotating black holes 

    Torres Herrera, Ramon; Fayos Vallés, Francisco (2017-01-01)
    Article
    Open Access
    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 causal characterization of singularities in spherically symmetric spacetimes 

    Fayos Vallés, Francisco; Torres Herrera, Ramon (2011-10-14)
    Article
    Restricted access - publisher's policy
  • On the interior of (quantum) black holes 

    Torres Herrera, Ramon (2013-06-20)
    Article
    Open Access
    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 invariant causal characterization of singularities in spherically symmetric spacetimes 

    Fayos Vallés, Francisco; Torres Herrera, Ramon (2012-04-18)
    Article
    Open Access
    The causal character of singularities is often studied in relation to the existence of naked singularities and the subsequent possible violation of the cosmic censorship conjecture. Generally, one constructs a model in the ...
  • On the quantum corrected gravitational collapse 

    Torres Herrera, Ramon; Fayos Vallés, Francisco (Elsevier, 2015-06-09)
    Article
    Open Access
    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
    Open Access
    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 ...
  • Singularity-free gravitational collapse and asymptotic safety 

    Torres Herrera, Ramon (Elsevier, 2014-06-02)
    Article
    Open Access
    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 ...
  • Singularity free gravitational collapse in an effective dynamical quantum spacetime 

    Torres Herrera, Ramon; Fayos Vallés, Francisco (Elsevier, 2014-05-05)
    Article
    Open Access
    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 ...
  • The mechanism why colliders could create quasi-stable black holes 

    Torres Herrera, Ramon; Fayos Vallés, Francisco; Lorente Espín, Oscar (2013-09-09)
    Article
    Open Access
    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 ...