Propagating Degrees of Freedom in f(R) Gravity
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We have computed the number of polarization modes of gravitational waves propagating in the Minkowski background in f(R) gravity. These are three of two from transverse-traceless tensor modes and one from a massive trace mode, which confirms the results found in the literature. There is no massless breathing mode and the massive trace mode corresponds to the Ricci scalar. A newly defined metric tensor in f(R) gravity satisfies the transverse-traceless (TT) condition as well as the TT wave equation.
1998 ◽
Vol 13
(17)
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pp. 2979-2990
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2019 ◽
Vol 28
(05)
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pp. 1942003
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2016 ◽
Vol 13
(09)
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pp. 1650109
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2015 ◽
Vol 29
(23)
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pp. 1550166
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2015 ◽
Vol 30
(24)
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pp. 1550119
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