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Browsing Articles by Author "Bambi, Cosimo"

Browsing Articles by Author "Bambi, Cosimo"

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  • Black supernovae and black holes in non-local gravity 
    Bambi, Cosimo; Malafarina, Daniele; Modesto, Leonardo (ArXiv, 2016-04-22)
    In a previous paper, we studied the interior solution of a collapsing body in a non-local theory of gravity super-renormalizable at the quantum level. We found that the classical singularity is replaced by a bounce, after ...
  • Can we observationally test the weak cosmic censorship conjecture? 
    Kong, Lingyao; Malafarina, D.; Bambi, Cosimo (2014-08-04)
    In general relativity, gravitational collapse of matter fields ends with the formation of a spacetime singularity, where the matter density becomes infinite and standard physics breaks down. According to the weak cosmic ...
  • Gravitational blueshift from a collapsing object 
    Kong, Lingyao; Malafarina, D.; Bambi, Cosimo (2014-12-22)
    We discuss a counterintuitive phenomenon of classical general relativity, in which a significant fraction of the radiation emitted by a collapsing object and detected by a distant observer may be blueshifted rather than ...
  • Ka iron line profile from accretion disks around regular and singular exotic compact objects 
    Bambi, Cosimo; Malafarina, D. (2013-09-10)
    The nature of the super-massive black hole candidates in galactic nuclei can be tested by ana-lyzing the profile of the Ka iron line observed in their X-ray spectrum. In this paper, we consider the possibility that the ...
  • Non-singular quantum-inspired gravitational collapse 
    Bambi, Cosimo; Malafarina, D.; Modesto, Leonardo (2013-08-07)
    We consider general relativistic homogeneous gravitational collapses for dust and radiation. We show that replacing the density profile with an effective density justified by some quantum gravity framework leads to the ...
  • Note on the effect of a massive accretion disk in the measurements of black hole spins 
    Bambi, Cosimo; Malafarina, D.; Tsukamoto, Naoki (2014-06-25)
    The spin measurement of black holes has important implications in physics and astrophysics. Regardless of the specific technique to estimate the black hole spin, all the current approaches assume that the space-time geometry ...
  • Observational properties of rigidly rotating dust configurations 
    Ilyas, Batyr; Yang, Jinye; Malafarina, Daniele; Bambi, Cosimo (European Physical Journal C: Particles and Fields, 2017-07-11)
    We study the observational properties of a class of exact solutions of Einstein’s field equations describing stationary, axially symmetric, rigidly rotating dust (i.e. noninteracting particles).We ask the questionwhether ...
  • Singularity avoidance in classical gravity from four-fermion interaction 
    Bambi, Cosimo; Malafarina, D.; Marcian`o, Antonino; Modesto, Leonardo (2014-05-26)
    We derive the dynamics of the gravitational collapse of a homogeneous and spherically symmetric cloud in a classical set-up endowed with a topological sector of gravity and a non-minimal coupling to fermions. The effective ...
  • Singularity avoidance in quantum-inspired inhomogeneous dust collapse 
    Liu, Yue; Malafarina, D.; Modesto, Leonardo; Bambi, Cosimo (2014-08-17)
    In a previous paper, some of us studied general relativistic homogeneous gravitational collapses for dust and radiation, in which the density profile was replaced by an effective density justified by some quantum gravity ...
  • Terminating black holes in asymptotically free quantum gravity 
    Bambi, Cosimo; Malafarina, D.; Modesto, Leonardo (2014-02-03)
    We study the homogeneous gravitational collapse of a spherical cloud of matter in a super-renormalizable and asymptotically free theory of gravity. We nd a picture that di ers substantially from the classical scenario. ...