2026-11-05T06:41:42Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/449192023-08-27T23:06:45Zcom_20.500.14352_14col_20.500.14352_15

Ruiz Cembranos, José Alberto 2023-06-20T04:06:23Z 2023-06-20T04:06:23Z 2011 1742-6588 10.1088/1742-6596/315/1/012004 https://hdl.handle.net/20.500.14352/44919 http://dx.doi.org/10.1088/1742-6596/315/1/012004 http://iopscience.iop.org/ There is a non-trivial four-derivative extension of the gravitational spectrum that is free of ghosts and phenomenologically viable. It is the so called R^2-gravity since it is defined by the only addition of a term proportional to the square of the scalar curvature. Just the presence of this term does not improve the ultraviolet behaviour of Einstein gravity but introduces one additional scalar degree of freedom that can account for the dark matter of our Universe. eng https://creativecommons.org/licenses/by/3.0/es/ open access Atribución 3.0 España R^2 dark matter journal article