Cosmological forecasts from current observations of LIGO
  We use the simulated gravitational-wave data to explore the evolution of the
universe in light of current observations of the Laser Interferometer
Gravitational-Wave Observatory (LIGO). Taking advantage of state-of-the-art
Markov Chain Monte Carlo technique to constrain the basic cosmological
parameters, the Hubble constant, present matter density parameter and equation
of state of dark energy, we find that LIGO needs about, at least 5-year data
accumulation, namely about 1000 events, to achieve the accuracy comparable to
the Planck result. We also find that, from a new information channel, the
constrained value of the Hubble constant from 1000 simulated events is more
consistent with the direct local observation by Riess et al. than the indirect
global measurement by the Planck Collaboration at the $2\sigma$ confidence
level. The combination of gravitational waves and electromagnetic signals is
very prospective to reveal the underlying physics of the universe.
