3,555 research outputs found
Standard sirens and dark sector with Gaussian process
The gravitational waves from compact binary systems are viewed as a standard
siren to probe the evolution of the universe. This paper summarizes the
potential and ability to use the gravitational waves to constrain the
cosmological parameters and the dark sector interaction in the Gaussian process
methodology. After briefly introducing the method to reconstruct the dark
sector interaction by the Gaussian process, the concept of standard sirens and
the analysis of reconstructing the dark sector interaction with LISA are
outlined. Furthermore, we estimate the constraint ability of the gravitational
waves on cosmological parameters with ET. The numerical methods we use are
Gaussian process and the Markov-Chain Monte-Carlo. Finally, we also forecast
the improvements of the abilities to constrain the cosmological parameters with
ET and LISA combined with the \it Planck.Comment: 10 pages, 8 figures, prepared for the proceedings of the
International Conference on Gravitation : Joint Conference of ICGAC-XIII and
IK1
Petrov type I Condition and Rindler Fluid in Vacuum Einstein-Gauss-Bonnet Gravity
Recently the Petrov type I condition is introduced to reduce the degrees of
freedom in the extrinsic curvature of a timelike hypersurface to the degrees of
freedom in the dual Rindler fluid in Einstein gravity. In this paper we show
that the Petrov type I condition holds for the solutions of vacuum
Einstein-Gauss-Bonnet gravity up to the second order in the relativistic
hydrodynamic expansion. On the other hand, if imposing the Petrov type I
condition and Hamiltonian constraint on a finite cutoff hypersurface, the
stress tensor of the relativistic Rindler fluid in vacuum Einstein-Gauss-Bonnet
gravity can be recovered with correct first order and second order transport
coefficients.Comment: 25 page
- …