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

Charalampos Bogdanos; Salvatore Capozziello; Mariafelicia De Laurentis; Savvas Nesseris

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

Charalampos Bogdanos, Salvatore Capozziello, Mariafelicia De Laurentis, Savvas Nesseris

Niels Bohr Internationale Akademi

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Abstract

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.

Originalsprog	Engelsk
Udgiver	arXive: 0911.3094
Antal sider	11
Status	Udgivet - 2009

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AU - Bogdanos, Charalampos

AU - Capozziello, Salvatore

AU - De Laurentis, Mariafelicia

AU - Nesseris, Savvas

N1 - Keywords: gr-qc

PY - 2009

Y1 - 2009

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 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.

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 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.

M3 - Working paper

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

PB - arXive: 0911.3094

ER -

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

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