Astrofísicas: Gravitación

  • Publicación
    Kicking Time Back in Black Hole Mergers: Ancestral Masses, Spins, Birth Recoils, and Hierarchical-formation Viability of GW190521
    A pair-instability supernova (PISN) prevents black hole (BH) formation from stellar collapse within the approximate mass range M ∈ [65, 130] M ⊙. However, such...
  • Publicación
    Light-curve models for a pulsar orbiting a Kerr black hole
    We have studied the signal received by a distant observer from a pulsar orbiting a stellar black hole. The binary system has a non-eccentric orbit and the most...
  • Charla
    Matters of gravity
    Contrary to popular belief, on very large distance scales visible matter stubbornly refuses to "fall" according to the laws of gravity of both Newton and...
  • Publicación
    Microlensing analysis of 14.5-year light curves in SDSS J1004+4112: Quasar accretion disk size and intracluster stellar mass fraction
    Context. The gravitational lens system SDSS J1004+4112 was the first known example of a quasar lensed by a galaxy cluster. The interest in this system has been...
  • Publicación
    MONDian dynamical modelling of NGC 288 with β ≠ 0
    NGC 288 is a diffuse Galactic globular cluster; it is remarkable in that its low density results in internal accelerations being below the critical MOND a0...
  • Publicación
    Numerical simulations of dark matter haloes produce polytropic central cores when reaching thermodynamic equilibrium
    Self-gravitating astronomical objects often show a central plateau in the density profile (core) whose physical origin is hotly debated. Cores are theoretically...
  • Publicación
    On the orbital velocity of isolated galaxy pairs: a test of gravity in the low acceleration regime
    The dynamics of isolated galaxy pairs represents an important tool to investigate the behaviour of gravity in the low acceleration regime. Statistical analysis...
  • Publicación
    On the orbital velocity of isolated galaxy pairs: II accurate MOND predictions
    Examining a catalogue of isolated galaxy pairs, a preferred orbital intervelocity of ~ 150 km s -1 was recently reported. This discovery is difficult to...
  • Charla
    Origin of space and time in a non-commutative cosmological model
    A Friedman-like cosmological model, based on noncommutative geometry, is presented. Its Planck level is totally nonlocal with no space and no time. The dynamics...