Article

Scattering of gravitational radiation by a Schwarzschild black-hole.

Department of Physics, New York University, New York, NY 10012, USA.
Nature (Impact Factor: 38.6). 09/1970; 227(5261):936-8. DOI: 10.1038/227936a0
Source: PubMed

ABSTRACT THE discovery of pulsars and the general conviction that they are
neutron stars resulting from gravitational collapse have strengthened
the belief in the possible presence of Schwarzschild black-holes-or
Schwarzschild horizons-in nature, the latter being the ultimate stage in
the progressive spherical collapse of a massive star. The stability of
these objects, which has been discussed in a recent report1,
ensures their continued existence after formation. Inasmuch as the
infinite redshift associated with it and its behaviour as a one-way
membrane make the Schwarzschild horizon at once elusive and intriguing,
it is important to explore theoretically all possible modes in which the
presence of such a black-hole manifests itself. In what follows, we
present a partial summary of some results obtained from an investigation
of the scattering of gravitational waves by a Schwarzschild horizon.

0 Bookmarks
 · 
213 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Similar to the superradiant effect in Reissner-Nordstr\"{o}m black hole, a charged scalar field can be amplified when impinging on the charged black hole in string theory. According to the black-hole bomb mechanism, the mass term of the incident field can effectively works as the reflecting mirror, which may trigger the instability of black hole. We study the possible instability triggered by superradiant effect and demonstrate that the charged black hole in string theory is stable against the massive charged scalar perturbation. The reason is that there is no trapping potential well in the black hole exterior and there is no bound states in the superradiant regime.
    Physical Review D 10/2013; · 4.69 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: The analogy between sound wave propagation and light waves led to the study of acoustic holes, the acoustic analogues of black holes. Many black hole features have their counterparts in acoustic holes. The Kerr metric, the rotating metric for black holes in general relativity, has as analogue the draining bathtub metric, a metric for a rotating acoustic hole. Here we report on the progress that has been made in the understanding of features, such as quasinormal modes and tails, superresonance, and instabilities when the hole is surrounded by a reflected mirror, in the draining bathtub metric. Given then the right settings one can build up from these instabilities an apparatus that stores energy in the form of amplified sound waves. This can be put to wicked purposes as in a bomb, or to good profit as in a sonic plant.
    12/2013;
  • [Show abstract] [Hide abstract]
    ABSTRACT: We investigated quasinormal frequencies (QNFs) in black brane with hyperscaling violating by using the continued fractions method. We calculate QNF of massless scalar field and electromagnetic field both with zero spatial momentum, find that QNFs have negative imaginary frequency suggesting black brane with hyperscaling violation is stable under those perturbations.
    Modern Physics Letters A 12/2013; 28(37):50145-. · 1.11 Impact Factor