1108.1317 (Walter Del Pozzo)
Walter Del Pozzo
The precise measurement of the Hubble constant $H_0$ is among the foundations
of the current cosmological paradigm. Due to correlations between $H_0$ and the
remaining cosmological parameters, a precise measurement of $H_0$ is critical
in view of future high redshift surveys. By 2015, second generation
ground-based laser interferometers are expected to deliver a wealth of
gravitational waves (GW) events from coalescing compact binaries up to a
redshift of about 0.3. Being free of the systematics affecting electromagnetic
measurements, GW offer the possibility of an independent measurement of $H_0$
with great accuracy. This work presents a general method based on Bayesian
inference aimed at estimating the value of the cosmological parameters for any
GW event. In contrast to earlier work, this framework does not require the
precise identification of the putative optical counterpart, but it considers
all the potential galaxy hosts consistent with the measured sky position and
distance posterior distributions. When applied to the planned worldwide network
of second generation interferometers, 50 GW events will yield a measurement of
$H_0$ with an uncertainty of few percent.
View original:
http://arxiv.org/abs/1108.1317
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