It is accepted that quasars are powered by supermassive black holes (SMBH) with masses in the range 10 − 10M in their cores. Occasionally, compact stars can plunge into SMBH. In addition, there may be a number of such compact objects circling the central SMBH in any given quasar. Both of these processes are known to emit gravitational waves. LISA has the right sensitivity to detect these waves....

A cosmology with the growing cosmological constant (CC) energy density is considered. The requirement of general covariance implies the time dependence of the gravitational constant G. Irrespectively of the exact functional form of the growth of the CC energy density, the universe ends in a de Sitter regime with a constant asymptotic Λ, but vanishing G. Although there is no divergence of the sc...

Gravitational radiation that propagates through an inhomogeneous mass distribution is subject to random gravitational lensing, or scattering, causing variations in the wave amplitude and temporal smearing of the signal. A statistical theory is constructed to treat these effects. The statistical properties of the wave amplitude variations are a direct probe of the power spectrum of the mass dist...

Solutions of the Einstein equations which are periodic and have standing gravitational waves, in the weak-field zone, are valuable approximations to more physically realistic solutions with outgoing waves. A variational principle for the periodic solutions is found which has the power to provide, for binary systems with weak gravitational radiation, an accurate estimate of the relationship betw...

It is shown that linearized gravitational radiation confined in a cavity can achieve thermal equilibrium if the mean density of the radiation and the size of the cavity satisfy certain constraints. PACS numbers: 04.30, 05.70.−a, 05.40.Jc Is it possible, in principle, to confine gravitational radiation in a box, for a time long enough for it to achieve thermal equilibrium? This issue has been in...

The completion of a network of advanced laser-interferometric gravitational-wave observatories around 2001 will make possible the study of the inspiral and coalescence of binary systems of compact objects (neutron stars and black holes), using gravitational radiation. To extract useful information from the waves, such as the masses and spins of the bodies, theoretical general relativistic gravi...

We have carried out 3-D numerical simulations of the dynamical bar instability in a rotating star and the resulting gravitational radiation using both an Eulerian code written in cylindrical coordinates and a smooth particle hydrodynamics (SPH) code. The star is modeled initially as a polytrope with index n = 3/2 and Trot/|W | ≈ 0.30, where Trot is the rotational kinetic energy and |W | is the ...

Evidence for gravitational radiation from binary pulsars places constraints on properties of “large” extra dimensions. The size of these extra dimensions must exceed about 37 AU for gravitational radiation to be emitted. Subject headings: string theory — gravitation — relativity Typeset using REVTEX

Discussion of different types of osculating orbital elements for motion of real dust particle under the action of electromagnetic radiation in the central gravitational field is presented. It is shown that physically correct access is based on gravitational acceleration as the only radial acceleration – " radiation pressure " is not included in the radial acceleration.

Continuous wave gravitational radiation from isolated rotating neutron stars is discussed. The general waveform and orders of magnitude for the amplitude are presented for various known pulsars. The specific case of gravitational radiation resulting from the distortion induced by the stellar magnetic field is presented. Finally some preliminary results about the signal from the whole population...