Point particle orbiting a Schwarzschild black hole: Phase-integral analysis of the gravitational radiation emitted

1993 ◽  
Vol 48 (10) ◽  
pp. 4771-4778 ◽  
Author(s):  
Nils Andersson
Keyword(s):  
Black Hole ◽  
Gravitational Radiation ◽  
Point Particle ◽  
Schwarzschild Black Hole ◽  
Integral Analysis ◽  
Phase Integral

scholarly journals Model for Gravitational Radiation from the Galactic Center: Infall of a Particle into a Black Hole

1997 ◽  
Vol 12 (25) ◽  
pp. 1879-1882 ◽  
Author(s):  
Carlos O. Lousto
Keyword(s):  
Black Hole ◽  
Gravitational Radiation ◽  
Galactic Center ◽  
Point Particle ◽  
Schwarzschild Black Hole ◽  
Transform Methods ◽  
Radiated Energy

We present here the results of the study of the gravitational radiation generated by the infall (from rest at radius r0) of a point particle of mass m0 into a Schwarzschild black hole of mass M. We use Laplace's transform methods and find that the spectra of radiation for ~5M<r0<∞ presents a series of evenly spaced bumps. The total radiated energy is not monotonically decreasing with r0, but presents a joroba (hunch-back) at around r0≈4.5M. We finally discuss the detectability of the gravitational radiation coming from the black hole in the center of our galaxy.

Gravitational synchrotron radiation in the metric of a new theory of gravitation

1980 ◽  
Vol 58 (11) ◽  
pp. 1595-1598 ◽  
Author(s):  
R. B. Mann ◽  
J. W. Moffat
Keyword(s):  
Black Hole ◽  
Wave Equation ◽  
Synchrotron Radiation ◽  
Gravitational Radiation ◽  
Field Structure ◽  
Astrophysical Object ◽  
Schwarzschild Black Hole ◽  
Null Surface ◽  
Strong Source ◽  
Theory Of Gravitation

The wave equation for a scalar field ψ is solved in the background metric of a new theory of gravity, based on a non-Riemannian field structure with a nonsymmetric Hermitian gμν. In contrast to the solution of the problem in a Schwarzschild background metric, in which only orbits close to r ~ 3M yield significant gravitational radiation, the new metric leads to an effective potential with stable orbits for a substantial range of r. The solution yields ψ = (1 − ℓ4/r4)−1/2ψGR where ℓ is a new integration constant. The null surface r = ℓ determines an astrophysical object called a "deflectar", which for ℓ > 2M conceals the Schwarzschild black-hole event horizon at r = 2M. As r → ℓ the gravitational synchrotron radiation increases to infinity. The actual power output of gravitational radiation for physically allowed stable orbits closest to r = ℓ is estimated, demonstrating that a deflectar is a potentially strong source of gravitational radiation.

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