Understand
In a general metric theory of gravitation in four dimensions, six polarizations of a gravitational wave are allowed: two scalar and two vector modes, in addition to two tensor modes in general relativity.
- Such additional polarization modes appear due to additional degrees of freedom in modified theories of gravitation or theories with extra dimensions.
- Thus, observations of gravitational waves can be utilized to constrain the extended models of gravitation.
- In this paper, we investigate detectability of additional polarization modes of gravitational waves, particularly focusing on a stochastic gravitational-wave background, with laser-interferometric detectors on the Earth.
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