Massive, massless and ghost modes of gravitational waves from higher-order gravity

TY - JOUR

T1 - Massive, massless and ghost modes of gravitational waves from higher-order gravity

AU - Bogdanos, C.

AU - Capozziello, S.

AU - De Laurentis, M.

AU - Nesseris, Savvas

PY - 2010/11/1

Y1 - 2010/11/1

N2 - 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. 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.

AB - 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. 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.

U2 - 10.1016/j.astropartphys.2010.08.001

DO - 10.1016/j.astropartphys.2010.08.001

M3 - Journal article

SN - 0927-6505

VL - 34

SP - 236

EP - 244

JO - Astroparticle Physics

JF - Astroparticle Physics

IS - 4

ER -