Testing metric-affine f(R)-gravity by relic scalar gravitational waves

Abstract

We discuss the emergence of scalar gravitational waves in metric-affine f(R)-gravity. Such a component allows to discriminate between metric and metric-affine theories The intrinsic meaning of this result is that the geodesic structure of the theory can be discriminated. We extend the formalism of cross correlation analysis, including the additional polarization mode, and calculate the detectable energy density of the spectrum for cosmological relic gravitons. The possible detection of the signal is discussed against sensitivities of VIRGO, LIGO and LISA interferometers.

12 pages, 4 figures

References in corpus (14)

• Extended Theories of Gravity and their Cosmological and Astrophysical Applications
• Cosmological viability of f(R)-gravity as an ideal fluid and its compatibility with a matter dominated phase
• Confirmation of general relativity on large scales from weak lensing and galaxy velocities
• Metric-affine f(R) theories of gravity
• Dark Energy: the equation of state description versus scalar-tensor or modified gravity
• Probing non-tensorial polarizations of stochastic gravitational-wave backgrounds with ground-based laser interferometers
• Accelerating cosmologies from non-local higher-derivative gravity
• Newton law corrections and instabilities in $f(R)$ gravity with the effective cosmological constant epoch
• f(R) Gravity with Torsion: The Metric-Affine Approach
• Generalized Brans-Dicke theories
• $f(R)$ gravity constrained by PPN parameters and stochastic background of gravitational waves
• f(R) cosmology with torsion
• The cosmological constant as an eigenvalue of f(R)-gravity Hamiltonian constraint
• f(R) gravity with torsion: a geometric approach within the J-bundles framework