We report the outcome of a 3-day workshop on the Hubble constant (H_0) that
took place during February 6-8 2012 at the Kavli Institute for Particle
Astrophysics and Cosmology, on the campus of Stanford University. The
participants met to address the following questions. Are there compelling
scientific reasons to obtain more precise and more accurate measurements of H_0
than currently available? If there are, how can we achieve this goal? The
answers that emerged from the workshop are (1) better measurements of H_0
provide critical independent constraints on dark energy, spatial curvature of
the Universe, neutrino physics, and validity of general relativity, (2) a
measurement of H_0 to 1% in both precision and accuracy, supported by rigorous
error budgets, is within reach for several methods, and (3) multiple paths to
independent determinations of H_0 are needed in order to access and control
systematics.

报道了一个在 Stanford University 举办的有关哈勃常数（H_0）的三天研讨会，该研讨会得出结论：更好的 H_0 测量可为黑暗能量、宇宙的空间曲率、中微子物理以及广义相对论的有效性等提供关键约束；在精度和准确性方面为 1％的 H_0 测量是可行的；需要通过多个方法来独立测定 H_0。