On Thu, Mar 17, 2016 at 7:43 PM, <mix...@bigpond.com> wrote: See my reply to David. Everyone is making the assumption that a force can > only > act against another object, because that has always been our experience. > This > may be the first tangible experience of a force acting against the vacuum > itself, rather than another object. > > If we can warp spacetime, we can also push against it. >
Does this require that the vacuum be something other than a frictionless superfluid? Eric
