Particle scattering by a test fluid on a Schwarzschild spacetime: the equation of state matters (Articolo in rivista)

Type
Label
  • Particle scattering by a test fluid on a Schwarzschild spacetime: the equation of state matters (Articolo in rivista) (literal)
Anno
  • 2012-01-01T00:00:00+01:00 (literal)
Alternative label
  • Bini D., Geralico A., Succi S. (2012)
    Particle scattering by a test fluid on a Schwarzschild spacetime: the equation of state matters
    in European physical journal. C, Particles and fields (Print)
    (literal)
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  • Bini D., Geralico A., Succi S. (literal)
Pagina inizio
  • 1913 (literal)
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  • 72 (literal)
Rivista
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  • 3 (literal)
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  • D. Bini Istituto per le Applicazioni del Calcolo \lq\lq M. Picone,\" CNR, I-00185 Rome, Italy ICRA, University of Rome \lq\lq La Sapienza,\" I-00185 Rome, Italy A. Geralico Physics Department, University of Rome \lq\lq La Sapienza,\" I-00185 Rome, Italy ICRA, University of Rome \lq\lq La Sapienza,\" I-00185 Rome, Italy S. Succi Istituto per le Applicazioni del Calcolo \lq\lq M. Picone,\" CNR, I-00185 Rome, Italy (literal)
Titolo
  • Particle scattering by a test fluid on a Schwarzschild spacetime: the equation of state matters (literal)
Abstract
  • The motion of a massive test particle in a Schwarzschild spacetime surrounded by a perfect fluid with equation of state $p_0= w \rho_0$ is investigated. Deviations from geodesic motion are analyzed as a function of the parameter $w$, ranging from $w=1$ which corresponds to the case of massive free scalar fields, down into the so-called ``phantom\" energy, with $w<-1$. It is found that the interaction with the fluid leads to capture (escape) of the particle trajectory in the case +w>0$ ($<0$), respectively. Based on this result, it is argued that inspection of the trajectories of test particles in the vicinity of a Schwarzschild black hole with matter around may offer a new means of gaining insights into the nature of cosmic matter. (literal)
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