Generalization of conformal-disformal transformations of the metric in scalar-tensor theories
We study new classes of metric transformations in the context of scalar-tensor theories, which involve both higher derivatives of the scalar field and derivatives of the metric itself. In general, such transformations are not invertible as they involve derivatives of the metric, which typically leads to instability due to Ostrogradsky ghosts. We show, however, that a certain class of this type of transformations is invertible: We construct new examples of invertible conformal (and also disformal) transformations with higher derivatives. Finally, we make use of these new transformations to construct extended mimetic theories of gravity, and we study their properties in the context of cosmology.
Authors
- Karim Noui (ORCID: https://orcid.org/0000-0002-7782-7474)
- Keisuke Izumi (ORCID: https://orcid.org/0000-0001-6653-4724)
- Eugeny Babichev (ORCID: https://orcid.org/0000-0003-4932-587X)
- Norihiro Tanahashi (ORCID: https://orcid.org/0000-0001-7539-7637)
- Masahide Yamaguchi (ORCID: https://orcid.org/0000-0002-2193-5273)
Institutions
- Tokyo Institute of Technology (JP)
- Kyoto University (JP)
- Université Paris-Saclay (FR)
- Institute for Basic Science (KR)
- Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR)
- Nagoya University (JP)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2024-09-20
- DOI
- https://doi.org/10.1103/physrevd.110.064063
- Citations
- 9
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 2.98
Funders
- Agence Nationale de la Recherche
- Ministry of Education, Culture, Sports, Science and Technology
- Institute for Basic Science
- Japan Society for the Promotion of Science