Propagating degrees of freedom in f(R) gravity

Yun Soo Myung

Propagating degrees of freedom in f(R) gravity

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arxiv 1608.01764 v2 pith:RESPDEKE submitted 2016-08-05 gr-qc hep-th

Yun Soo Myung This is my paper · ORCID

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keywords gravitymodemassivemodespropagatingtensortracetransverse-traceless

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abstract

We have computed the number of polarization modes of gravitational waves propagating in the Minkowski background in $f(R)$ gravity. This is 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.

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Neutron star in Logarithmic model of Cartan $F(R)$ gravity
gr-qc 2024-12 reject novelty 6.0 of 10

In Cartan F(R) gravity with a logarithmic potential, a scalar field can raise the minimum neutron star mass to near one solar mass, but only for hand-tuned parameters that imply a huge vacuum energy.

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