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gr-qc2021★ 16 cited
Covariant 3+1 correspondence of the spatially covariant gravity and the degeneracy conditions
Yu-Min Hu, Xian Gao
A necessary condition for a generally covariant scalar-tensor theory to be ghostfree is that it contains no extra degrees of freedom in the unitary gauge, in which the Lagrangian c…
gr-qc2021★ 20 cited
Spatially covariant gravity with two degrees of freedom: perturbative analysis
Yu-Min Hu, Xian Gao
We revisit the problem of building the Lagrangian of a large class of metric theories that respect spatial covariance, which propagate at most two degrees of freedom and in particu…