Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- General Relativity (7)
- Gravitational waves (6)
- Differential Geometry (4)
- Computer Algebra (3)
- Einstein Field Equations (3)
-
- Electrovacuum (3)
- Gravitational wave (3)
- LISA (3)
- Black hole physics (2)
- Einstein Maxwell equations (2)
- Einstein equations (2)
- Einstein-Maxwell Equations (2)
- Interferometers (2)
- Rainich Conditions (2)
- Rainich conditions (2)
- Airglow (1)
- Algebraic computing (1)
- Astrophysical bounds (1)
- Binary star observations (1)
- Binary stars (1)
- Black hole interiors (1)
- Black hole mass (1)
- Black hole shadow (1)
- Black holes (1)
- Computer Algebran (1)
- Curvature invariants (1)
- DEEPWAVE (1)
- DifferentialGeometry (1)
- Early Universe (1)
- Einstein-Maxwell equations (1)
- Publication Year
- Publication
- File Type
Articles 31 - 35 of 35
Full-Text Articles in Physical Sciences and Mathematics
Unequal Arm Space-Borne Gravitational Wave Detectors, Shane L. Larson, Ronald W. Hellings, William A. Hiscock
Unequal Arm Space-Borne Gravitational Wave Detectors, Shane L. Larson, Ronald W. Hellings, William A. Hiscock
All Physics Faculty Publications
Unlike ground-based interferometric gravitational wave detectors, large space-based systems will not be rigid structures. When the end stations of the laser interferometer are freely flying spacecraft, the armlengths will change due to variations in the spacecraft positions along their orbital trajectories, so the precise equality of the arms that is required in a laboratory interferometer to cancel laser phase noise is not possible. However, using a method discovered by Tinto and Armstrong, a signal can be constructed in which laser phase noise exactly cancels out, even in an unequal arm interferometer. We examine the case where the ratio of the …
Using Binary Star Observations To Bound The Mass Of The Graviton, Shane L. Larson, William A. Hiscock
Using Binary Star Observations To Bound The Mass Of The Graviton, Shane L. Larson, William A. Hiscock
All Physics Faculty Publications
Interacting white dwarf binary star systems, including helium cataclysmic variable (HeCV) systems, are expected to be strong sources of gravitational radiation, and should be detectable by proposed space-based laser interferometer gravitational wave observatories such as LISA. Several HeCV star systems are presently known and can be studied optically, which will allow electromagnetic and gravitational wave observations to be correlated. Comparisons of the phases of a gravitational wave signal and the orbital light curve from an interacting binary white dwarf star system can be used to bound the mass of the graviton. Observations of typical HeCV systems by LISA could potentially …
Sensitivity Curves For Spaceborne Gravitational Wave Interferometers, Shane L. Larson, William A. Hiscock, Ronald W. Hellings
Sensitivity Curves For Spaceborne Gravitational Wave Interferometers, Shane L. Larson, William A. Hiscock, Ronald W. Hellings
All Physics Faculty Publications
To determine whether particular sources of gravitational radiation will be detectable by a specific gravitational wave detector, it is necessary to know the sensitivity limits of the instrument. These instrumental sensitivities are often depicted (after averaging over source position and polarization) by graphing the minimal values of the gravitational wave amplitude detectable by the instrument versus the frequency of the gravitational wave. This paper describes in detail how to compute such a sensitivity curve given a set of specifications for a spaceborne laser interferometer gravitational wave observatory. Minor errors in the prior literature are corrected, and the first (mostly) analytic …
Astrophysical Bounds On Global Strings, Shane L. Larson, William A. Hiscock
Astrophysical Bounds On Global Strings, Shane L. Larson, William A. Hiscock
All Physics Faculty Publications
Global topological defects produce nonzero stress energy throughout spacetime, and as a result can have observable gravitational influence on surrounding matter. Gravitational effects of global strings are used to place bounds on their cosmic abundance. The minimum separation between global strings is estimated by considering the defects' contribution to the cosmological energy density. More rigorous constraints on the abundance of global strings are constructed by examining the tidal forces such defects will have on observable astrophysical systems. The small number of observed tidally disrupted systems indicates there can be very few of these objects in the observable Universe.
Semiclassical Effects In Black Hole Interiors, William A. Hiscock, Shane L. Larson, Paul R. Anderson
Semiclassical Effects In Black Hole Interiors, William A. Hiscock, Shane L. Larson, Paul R. Anderson
All Physics Faculty Publications
First-order semiclassical perturbations to the Schwarzschild black hole geometry are studied within the black hole interior. The source of the perturbations is taken to be the vacuum stress-energy of quantized scalar, spinor, and vector fields, evaluated using analytic approximations developed by Page and others (for massless fields) and the DeWitt-Schwinger approximation (for massive fields). Viewing the interior as an anisotropic collapsing cosmology, we find that minimally or conformally coupled scalar fields, and spinor fields, decrease the anisotropy as the singularity is approached, while vector fields increase the anisotropy. In addition, we find that for massless fields of all spins, the …