2009/11/30 by Charalampos Bogdanos, Salvatore Capozziello, Mariafelicia De Laurentis +1 · 1 citation
Physics and Astronomy · #gr-qc
paper · pdf · doi:10.1016/j.astropartphys.2010.08.001
published as Astropart.Phys.34:236-244,2010 · 11 pages, 3 figures
arxiv created 2010/01/26 · arxiv updated 2014/11/20
We linearize the field equations for higher order theories that contain scalar invariants other than the Ricci scalar. We find that besides a massless spin-2 field (the standard graviton), the theory contains also spin-0 and spin-2 massive modes with the latter being, in general, ghost modes. Then, we investigate the possible detectability of such additional polarization modes of a stochastic gravitational wave by ground-based and space interferometric detectors. Finally, we extend the formalism of the cross-correlation analysis, including the additional polarization modes, and calculate the detectable energy density of the spectrum for a stochastic background of the relic gravity waves that corresponds to our model. For the situation considered here, we find that these massive modes are certainly of interest for direct detection by the LISA experiment.