Search

Your search keyword '"Felice, Antonio De"' showing total 15 results
Start Over Author "Felice, Antonio De" Database Complementary Index
15 results on '"Felice, Antonio De"'

2. On the cosmology of massive gravity.

Author

Felice, Antonio De, Gümrükçüoğlu, A Emir, Lin, Chunshan, and Mukohyama, Shinji

Subjects
METAPHYSICAL cosmology, GRAVITY, NONLINEAR theories, PARAMETER estimation, GENERAL relativity (Physics), MATHEMATICAL models
Abstract

We present a review of cosmological solutions in nonlinear massive gravity, focusing on the stability of perturbations. Although homogeneous and isotropic solutions have been found, these are now known to suffer from either the Higuchi ghost or a new nonlinear ghost instability. We discuss two approaches to alleviate this issue. By relaxing the symmetry of the background by e.g. breaking isotropy in the hidden sector, it is possible to accommodate a stable cosmological solution. Alternatively, extending the theory to allow for new dynamical degrees of freedom can also remove the conditions which lead to the instability. As examples for this case, we study the stability of self-accelerating solutions in the quasi-dilatonic extension and generic cosmological solutions in the varying mass extension. While the quasi-dilaton case turns out to be unstable, the varying mass case allows stable regimes of parameters. Viable self-accelerating solutions in the varying mass theory yet remain to be found. [ABSTRACT FROM AUTHOR]

Published
2013
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results