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Title: | Gravitational waves in modified teleparallel theories |
Authors: | Farrugia, Gabriel Said, Jackson Gakis, Viktor Saridakis, Emmanuel N. |
Keywords: | Gravitational waves -- Mathematical models General relativity (Physics) Calculus of tensors Generalized spaces |
Issue Date: | 2018 |
Publisher: | American Physical Society |
Citation: | Farrugia, G., Said, J. L., Gakis, V., & Saridakis, E. N. (2018). Gravitational waves in modified teleparallel theories. Physical Review D, 97(12), 124064. |
Abstract: | We investigate the gravitational waves and their properties in various modified teleparallel theories, such as f (T ) , f (T ,B ) , and f (T ,TG) gravities. We perform the perturbation analysis both around a Minkowski background and in the case where a cosmological constant is present, and for clarity we use both the metric and the tetrad languages. For f (T ) gravity we verify the result that no further polarization modes comparing to general relativity are present at first-order perturbation level, and we show that in order to see extra modes one should look at third-order perturbations. For nontrivial f (T ,B ) gravity, by examining the geodesic deviation equations, we show that extra polarization models, namely the longitudinal and breathing modes, do appear at first-order perturbation level, and the reason for this behavior is the fact that although the first-order perturbation does not have any effect on T , it does affect the boundary term B . Finally, for f (T ,TG) gravity we show that at first-order perturbations the gravitational waves exhibit the same behavior as those of f (T ) gravity. Since different modified teleparallel theories exhibit different gravitational wave properties, the advancing gravitational-wave astronomy would help to alleviate the degeneracy not only between curvature and torsional modified gravity but also between different subclasses of modified teleparallel gravities. |
URI: | https://www.um.edu.mt/library/oar/handle/123456789/89258 |
Appears in Collections: | Scholarly Works - InsSSA |
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Gravitational_waves_in_modified_teleparallel_theories_2018.pdf Restricted Access | 265.25 kB | Adobe PDF | View/Open Request a copy |
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