Particle scattering by a test fluid on a Schwarzschild spacetime: the equation of state matters

作者：Bini Donato^*; Geralico Andrea; Succi Sauro

来源：European Physical Journal C, 2012, 72(3): 1913.

DOI：10.1140/epjc/s10052-012-1913-5

The motion of a massive test particle in a Schwarzschild spacetime surrounded by a perfect fluid with equation of state p(0) = omega rho(0) is investigated. Deviations from geodesic motion are analyzed as a function of the parameter omega, ranging from omega = 1, which corresponds to the case of massive free scalar fields, down into the so-called "phantom" energy, with omega < -1. It is found that the interaction with the fluid leads to capture (escape) of the particle trajectory in the case 1 + omega > 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.

• 出版日期2012-3