Gauge freedom for Gravitational Wave problems in tensor-scalar theories of gravity
نویسنده
چکیده
A specific choice of gauge is shown to imply a decoupling between the tensor and scalar components of Gravitational Radiation in the context of Brans-Dicke type theories of gravitation. The comparison of the predictions of these theories with those of General Relativity is thereby made straightforward.
منابع مشابه
Gravitational Wave Memory: A New Approach to Study Modified Gravity
It is well known that two types of gravitational wave memory exist in general relativity (GR): the linear memory and the non-linear, or Christodoulou memory. These effects, especially the latter, depend on the specific form of Einstein equation. It can then be speculated that in modified theories of gravity, the memory can differ from the GR prediction, and provides novel phenomena to study the...
متن کاملNegative energy and stability in scalar-tensor gravity
Linearized gravitational waves in Brans-Dicke and scalar-tensor theories carry negative energy. A gauge-invariant analysis shows that the background Minkowski space is stable at the classical level with respect to linear scalar and tensor inhomogeneous perturbations. PACS: 04.20.Cv, 04.30.-w
متن کاملLight amplification by gravitational waves in scalar–tensor theories of gravity
It is shown that the amplification of a light beam by gravitational waves in scalar–tensor theories of gravity is a first order effect in the wave amplitudes. In general relativity, instead, the effect is only of second order. To appear in Astrophysical Letters and Communications Scalar–tensor theories (ST) of gravity have been considered as alternatives to general relativity (GR) for a long ti...
متن کاملThe strong equivalence principle from a gravitational gauge structure
Gravitational self-interactions are assumed to be determined by the covariant derivative acting on the Riemann-Christoffel field strength. Once imposed on a metric theory, this Yang-Mills gauge constraint extends the equality of gravitational mass and inertial mass to compact bodies with non-negligible gravitational binding energy. Applied to generalized Brans-Dicke theories, it singles out one...
متن کاملComparing Solar - System , Binary - Pulsar , and Gravitational - Wave Tests of Gravity
This talk is based on my work in collaboration with Thibault Damour. We compare the probing power of different classes of gravity experiments: solar-system tests (weak-field regime), binary-pulsar tests (strong-field regime), and future gravitational-wave observations of inspi-ralling binaries (strong-field effects detected in our weak-gravitational-field conditions). This is done within the mo...
متن کامل