5 papers · 1 filter
Probing dynamical embeddings in a five-dimensional spacetime in light of DESI BAO
Abraão J. S. Capistrano, Emanuelly Silva, Rafael C. Nunes +1
We here investigate the observational viability of Nash gravity as an alternative to the standard CDM cosmology. Based on Nash's embedding theorem, the model introduces orthogo…
Shadows and amplitude luminosity of an embedded rotating black hole
Abraao J. S. Capistrano, Antonio C. Gutierrez-Pineres, Carlos H. Coimbra-Araujo
We investigate a rotating black hole embedded in a five-dimensional flat bulk by extending the Kerr metric through the Gurses-Gursey line element. Employing Boyer-Lindquist coordin…
ECO signatures from the Weyl-induced gravitational waveform injection
Abraão J. S. Capistrano, Newton M. S. Chávez, VÃctor A. M. León
We investigate gravitational wave emission from an oscillating star modeled in a static Weyl background using a modulated waveform ansatz. First, we revisit the Weyl metric and obt…
Slow-roll inflation from a geometric scalar-tensor model with self-interacting potentials
Abraão J. S. Capistrano, Gilberto M. Kremer
We consider slow-roll inflation in the context of a modified Brans-Dicke dilaton gravity. From a two self-interacting potentials , we reproduce a Starobinsky-like potential…
Lower tensor-to-scalar ratio as possible signature of modified gravity
Abraão J. S. Capistrano, Rafael C. Nunes, LuÃs A. Cabral
This paper simplifies the induced four-dimensional gravitational equations originating from a five-dimensional bulk within the framework of Nash's embeddings, incorporating them in…