期刊
UNIVERSE
卷 7, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/universe7060190
关键词
dark energy; alternative theories of gravity; scalar-tensor theories; generalized proca theories; Hamiltonian analysis
资金
- European Union's Horizon 2020 Research Council [724659]
- European Research Council (ERC) [724659] Funding Source: European Research Council (ERC)
Our analysis shows that coupling between vector fields described by the generalized Proca class of theories and a gravitational sector defined by a scalar-tensor theory of the degenerate type leads to the loss of at least one constraint associated with the scalar-tensor sector.
We prove that vector fields described by the generalized Proca class of theories do not admit consistent coupling with a gravitational sector defined by a scalar-tensor theory of the degenerate type. Under the assumption that there exists a frame in which the Proca field interacts with gravity only through the metric tensor, our analysis shows that at least one of the constraints associated with the degeneracy of the scalar-tensor sector is inevitably lost whenever the vector theory includes coupling with the Christoffel connection.
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