Flux Of Gravitational Radiation Research Articles

Design of a tunable detector for gravitational radiation

A design is proposed for a cryogenic detector for gravitational radiation. With a proper choice of a set of design parameters, the resonant frequency of the detector can be pre-selected to lie within 10-3 to 103 Hz; calculated values of these parameters are tabulated. Fine tuning of the detector is also possible. Using SQUID magnetometers to measure displacement, the expected gravitational radiation flux sensitivity is shown to be between 104 and 108 J m-2 per cycle for burst radiation, and less than 10-4 W m-2 for continuous radiation at pulsar frequencies.

Gravitational radiation from n-body systems

An expression for the quadrupole moment of any two-body system with structure is derived from a “paralel axes” theorem. Within the weak-field limit of the theory of general relativity, expressions for the gravitational radiation flux of energy and angular momentum from two particles or two spherically symmetric bodies in arbitrary plane motion arising from any type of forces are consequently obtained in terms of time derivatives of the relative coordinates of the system. An estimate of the gravitational flux from any plane motion follows. In particular, the flux from systems with Keplerian and straight-line motion are deduced as special cases. For the general problem of a two-body system with intrinsic quadrupole moment (due to deviation from spherical symmetry), it is found that in addition to the flux from the orbital and the spin motion there is another source of flux—the interaction flux. This is shown explicitly in two special cases—the system of a particle moving in the plane of symmetry of a Jacobi ellipsoid, and that of two spinning rigid rods in plane circular motion with parallel spin and orbital angular momentum. The interaction flux is regarded as the result of interaction of the bodies with gravitational waves. An outline of the method for the calculation of gravitational radiation flux from an n-body system is given. For a three-body system—an astrophysically interesting situation—this is worked out in detail. It is seen that the presence of an unsuspected third body can, by virtue of the interaction power term, increase the generation of gravitational waves significantly.

Gravitational radiation of Island systems with an electromagnetic field

A study is made of the gravitational radiation of a system of bounded sources in the presence of an electromagnetic field. A class of frames of reference-analogs of inertial frames in flat space-is introduced on the basis of the criterion proposed by Dozmorov. Expressions are obtained for the total energy of such systems and the flux of gravitational radiation.

Gravitational radiation of isolated systems

The gravitational radiation of isolated systems is studied by introducing a class of reference systems that is the analog of the class of inertial systems in flat space. Expressions for the total energy of these systems and the flux of gravitational radiation are obtained. The fundamental role of the Bondi-Metzner-Sachs asymptotic symmetry groups in the general theory of relativity is explained; transformations of the group characterize transitions from one reference system of a given class to another.

Gravitational Radiation and Observational Cosmology

view Abstract Citations (5) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Gravitational Radiation and Observational Cosmology Isaacson, Richard A. ; Winicour, Jeffrey Abstract Recent observations by Weber indicate that a high flux of gravitational radiation is now being generated within the Galaxy. Assuming our environment to be typical, we must expect all galaxies to behave similarly, leading to large total amounts of gravitational wave energy in the cosmos. We have constructed an evolutionary model for the generation of gravitational radiation subsequent to galaxy formation and examined how the dynamics of the Universe are affected by the conversion of matter into radiation over a time scale of several billion years. If our Galaxy now converts more than 100 M0 per year into gravitational waves, we find that this radiation can play as important a role as matter in the evolution of the Universe. We use the latest values of the Hubble constant and deceleration parameter and find that the lifetime of a radiating cosmology is shortened from the Friedmann value to lie in the range 11 to 14 billion years. Subject headings: cosmology - gravitation Publication: The Astrophysical Journal Pub Date: August 1973 DOI: 10.1086/152302 Bibcode: 1973ApJ...184...49I full text sources ADS |