243 research outputs found
Ghost-Free Massive Theories Modelled as Effective Einstein Spaces and Cosmic Acceleration
We study how massive ghost-free gravity -modified theories, MGFTs, can
be encoded into generic off-diagonal Einstein spaces. Using "auxiliary"
connections completely defined by the metric fields and adapted to nonholonomic
frames with associated nonlinear connection structure, we decouple and
integrate in certain general forms the field equations in MGFT. Imposing
additional nonholonomic constraints, we can generate Levi-Civita, LC,
configurations and mimic MGFT effects via off-diagonal interactions of
effective Einstein and/or Einstein-Cartan gravity with nonholonomically induced
torsion. We show that imposing nonholonomic constraints it is possible
reproduce very specific models of massive gravity studied in
\cite{sarid,odintsr}. The cosmological evolution of ghost-free off-diagonal
Einstein spaces is investigated. Certain compatibility of MGFT cosmology to
small off--diagonal deformations of CDM models is established.Comment: latex2e, 9 pages, version accepted to EJPC in a form modified
following referee's request
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